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PACIFIC PAGE 9-1

PACIFIC RADIO CORP.

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1506 Vibrator 130 Automatic Tuner

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diate frequency transformers for peak readings as indicated on the output

meter which is to be placed across the output transformer.

BROADCAST BAND: Adjust oscillator to 1400 KC and connect the output

of the generator to the antenna connection at the rear of the chassis

through a .0002 mfd. mica condenser. Set the pointer on the dial to 1400

KC making sure that the volume control is set at its maximum position.

Adjust the antenna and oscillator trimmers for maximum signal (as

indicated on the output meter). Re -set the dial pointer on the receiver and

on the test oscillator to 600 KC and check for alignment.



PACIFIC PAGE 9-5

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ALIGNMENT DATA FOR MDELS 35,43,302, 601, AND 8T --6V

INTERMEDIATE FREQUENCY: Set oscillator to 465 KC. Feed this to the grid of the pentagrid converter tube. Adjust trimmers on the intermediate frequency transformers for peak

readings as indicated on the output meter which is to be placed across the output transformer. BROADCAST BAND: Set the band switch for broadcast reception. Adjust oscillator to 1400 KC and connect the output of the generator to the antenna connection at the rear of the chassis through a .0002 mfd. mica condenser. Set the pointer on the dial to 1400 KC making sure that the volume control is set at its maximum position. Adjust the broadcast antenna and broadcast oscillator trimmers for maximum signal (as indicated on the output meter) Re -set the dial pointer on the receiver and on the test oscillator to 600 KC. Slowly increase or decrease the broadcast padding condenser while tuning back and forth across the signal with the station selector knob until the maximum reading is obtained on the output meter. Re -check the 1400 KC alignment as the adjustment at 600 KC may have slightly disturbed the original 1400 KC setting. INTERMEDIATE BAND: For a dummy antenna use a .0002 mfd. mica condensor ln series with a 400 ohm carbon resistor. Set band switch to the intermediate band position and feed a 5100 KC signal from the oscillator. Set dial pointer at 5100 KC. Adjust intermediate antenna and intermediate oscillator trimmers for maximum output. Re -set oscillator and set dial to approximately 1800 KC. Slowly increase or decrease the intermediate padding condenser while tuning back and forth across the signal with the station selector control until the maximum reading is obtained on the output meter. Re -check the 5100 KC adjustment. SHORT WAVE: Set band switch on short wave position. Connect the antenna of the radio receiver to the output of the test oscillator through a 400 ohm carbon resistor. Set oscillator and receiver dial at 15 megacycles. Adjust the short wave antenna and short wave oscillator ,trimming condensers for maximum output as indicated by readings on the output meter. No other adjustments are necessary for aligning this band.

It is advisable to check the sensitivity at 6000 KC to determine whether the circuits are properly aligned. Should the receiver lack sensitivity at this frequency check the .0035 mica condenser for short circuit.

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PACIFIC PAGE 9-7

PACIFIC RADIO CORP.

DO NOT ATTEMPT TO OPERATE THIS RECEIVER OIL z

DIRECT CURRENT (D.C.) OR ANY OTHER VOLTAGE OR CYCLE AS PER- º g

MANENT INJURY TO THE SET WILL RESULT. L

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RANGE IN KILOCYCLES 540- 1710 KC 1710- 5800 KC 5800-17500 KC

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INSTRUCTIONS Selector buttons are numbered from 1 to 5, reading from left to right. Stations

selected should be placed in numerical order with respect to frequency. Lowest frequency should appear on Selector No. 1. Next Lowest on Selector No. 2, and so on up to Selector No. 5 for station with highest frequency. ho- "requency, see above.

RECEIVERS LEAVE FACTORY ADJUSTED AS FOLLOWS: No. 1 button -600 K. C., No. 2-800 K. C., No. 3-1000 K. C., No. 4-1200 K. C., No. 5-1400 K. C.

PROCEDURE: Five stations should first be selected and considered in numerical order according to kilocycles. The station with the lowest frequency number should be assigned to the first push button-and so

Push button No. 1 to "IN" position, then select station assigned this button by turning Oscillator (Station selector) screw No. 1 until station is heard best, then further adjust by turning Antenna Trimmer screw No. 1 until station is heard with maximum volume and clarity. Remember, you can check your accuracy in setting the stations on the buttons by tuning the receiver manually to the station and then pushing the station button and comparing the results. (If the station desired has a lower kilocycle frequency than the button has been

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All receivers come in either standard 120 Volts, 50-60 Cycles or Universal 120 Volts and 240 Volts, 50-60 Cycles.

In the case of Universal transformer be certain that the connections on the voltage strip (Figure 3-4) correspond to the line voltage on which the radio is to be operated, otherwise the radio will be damaged. This terminal strip is located under the chassis and adjacent to power transformer leads.

o-P AMP FUSO

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MODELS 78B,79B,80B Chassis 77B,77BA Schematic,Sooket Trimmer s, Phone Notes

O e BATTERY MODEL

Be sure the "red" battery clip on end of radio battery lead is connected to the positive terminal of radio battery. DO NOT increase the length of battery leads. Leads to Winchargei may be any reasonable length, but should not be smaller than No. 10 wire for best results. A good, short and direct ground should be used on all battery models, connected to "G" terminal on back of radio.

Failure to use ground will result in poor performance. (See antenna and ground instructions on page 4.) Aligning and calibration instructions appear on pages 4 and 5.

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ALIGNMENT(SEE PROCEDURE Note: When making adjustments of modulator trimmers on all

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PATTERSON PAGE 9-5

MODELS 212,312,412 Alignment

YA'l'TERSON RADIO CO. MODEL 128 MODELS 168,268 MODELS 198,298 MODELS 208,308,408

Alignment and Calibration Procedure 8 -10 -12 -Tube Models

I. F. ALIGNMENT-ALL MODELS In the following instructions for alignment the term V. T. V. M.

shall be understood to mean Vacuum Tube Voltmeter or eye tube, and the term "resonance" means that the meter shows the greatest swing toward zero, or that the eye tube shows the narrowest dark section. Turn band selector switch to band "a" or No. 1. Place service oscillator in operation on 465 Kc. Connect grid of voltmeter to A. V. C. buss and ground of voltmeter to chassis. A convenient place to connect the voltmeter grid is on the terminal for the eye cable. This is located underneath on the floating R. F. section and between the back end of wave change switch and first R. F. tube socket. Connect to the terminal to which the green lead in the eye cable is connected. In lieu of a V. T. V. M. the eye tube itself may be used as a resonance indicator (adjusting for the narrowest dark section) although this method is seldom as accurate as when using a V. T. V. M. Another method which is by far the most accurate of all and which we strongly advise wherever possible is the use of the cathode ray oscilloscope and rotary sweep generator. This method will be discussed later in these notes.

Note: Refer to sketches in Figures 9, 10 and 11 for position of various tubes, coils and other components on all models.

CAUTION: Before making any adjustments on 12 tube model, be sure that the high fidelity switch is in the off position and remains there during adjustments. See tuning reference first page. Do not attempt to bend any of variable condenser plate flaps during alignment, particularly on the I2 tube models. The variable condensers are all carefully calibrated during the original alignment and should not require any further calibration during the life of the radio.

Remove grid cap from second I. F. tube (6K7) and apply oscillator output lead to grid of this tube and adjust trimmers on No. 3 I. F. transformer until resonance is indicated on V. T. V. M. The service oscillator output should be set for a quite high output when making this adjustment. Next remove oscillator lead and replace the cap on this tube. Then remove grid cap of first I. F. tube (6K7) and apply service oscillator output lead to grid of this tube and repeat adjustment as before this time adjusting trimmers on No. 2 I. F. transformer until V. T. V. M. indicates resonance. Reducing service oscillator output as necessary to obtain an easily readable indication. Next remove service oscillator lead and replace cap on first I. F. tube. Then remove cap from the Modulator tube 6A8 or 6L7 (as the case may be) and apply service oscillator output lead to grid of this tube, this time adjusting trimmers on No. 1 I. F. transformer, reducing service oscillator output as required and adjusting for resonance. Now without making any further changes go over all I. F. trimmers one by one carefully readjusting for exact resonance. This completes the alignment of the I. F. amplifier.

CALIBRATION OF VARIOUS BANDS -8.10 TUBE MODELS ONLY

Note: Refer to Figures 6, 9 and 10 for location of various coils and trimmers. (Refer to Fig. 5).for location of padding condensers.

BAND "A" (OR-No. 1) BROADCAST

Connect V. T. V. M. to A. V. C. buss and chassis ground, as described above for I. F. alignment. Turn band selector switch to band "A" (or No. 1). Place service oscillator in operation on 1400 Kc. and connect service oscillator output lead to antenna terminal of radio through a .0001 condenser or less or through standard dummy antenna. It will be necessary to keep the service oscillator output control well reduced during the following adjustments.

Set main tuning dial of radio to 1400 Kc. and adjust trimmer "A" in side of oscillator coil, Figure 4, to resonance. Next adjust trimmers "A" on the antenna and modulator coil to resonance. Next set service oscillator to 600 Kc. and set radio dial to 600 Kç. adjust padding condensers, "AP" to resonance. (Only a solid bakelite or other insulating screw driver will be satisfactory for adjusting any of the padding condensers as well as No. 3 I. F., an ordinary screw driver will be satisfactory for all other adjustments.) Now reset both service oscillator and radio dial to 1400 Kc. and retouch trimmer "A" on oscillator coil to resonance.

It may be well at this time also to recheck trimmers "A" on the antenna and modulator coils. This completes calibration and alignment of Band "A."

BAND "B" (OR NO. 2) SHORT WAVE BAND

Turn band selector switch to Band B, leaving all connections made as before for "A" band set service oscillator at 6 M. C. also set radio dial at 6 M. C. and adjust trimmer "B" on oscillator coil to resonance as indicated on V. T. V. M. Next adjust trimmers "B" on antenna and modulator coils to resonance. Change both service oscillator and radio dial to 2 M. C. and adjust "BP" padding condenser to resonance. Reset both radio dial and service oscillator to 6 M. C. and recheck trimmer "B" on oscillator coil for resonance. This completes calibration and alignment of Band "B."

BAND "C" (OR NO. 3) SHORT WAVE BAND

Turn band selector switch to Band "C." Set radio dial and service oscillator to 17 M. C. and adjust trimmer "C" on oscillator coil to resonance, it may be well to turn trimmers "C" on both antenna and modulator coils in about one turn before making above adjustment. Then after oscillator trimmer has been set retune trimmers "C" on modulate coil to resonance slowly turning main tuning dial back and forth slightly as adjustment is being made until resonance is, indicated on V. T. V. M., retouching oscillator trimmer "C" as necessary to keep it on the desired spot on tuning dial. Next adjust trimmer "C" on antenna coil to resonance without rocking main dial next set service oscillator and radio dial to 6 M. C. (Band "C") and adjust padding condenser "CP" to resonance, reset radio dial and service oscillator to 17 M. C. and recheck oscillator trimmer "C" for resonance. This completes adjustment of Band "C."

Note: When making adjustments of modulator trimmers on all models and particularly the highest frequency bands, loosening of the modulator trimmer too far may cause a false resonance indication caused by the oscillator curve being "crossed over" removing oscillator lead or changing oscillator frequency, will readily show if this has occurred as no change in resonance indication will be apparent, also the set will be quite dead at the high frequency end of the band the true resonance point is with the modulator screwed in about one turn or less from the point where blocking occurs. The true resonant point will be quite apparent on resonance indicating devices.

FIG. 6

X BAND (OR NO. 4)

(For models equipped with long wave weather or European band only.) Change wave band switch to "X" band. Set service oscillator and radio dial to 400 Kc., adjust oscillator trimmer "XOT" to resonance. Then adjust trimmers "XMT" and "XAT" to resonance. Then set both radio dial and service oscillator to 150 Kc. and adjust padding condenser "XP" to resonance. Reset both service oscillator and radio dial again to 400 Kc. and recheck trimmer "XOT" for resonance. This completes the calibration and alignment of all bands.

Calibration of Various Bands 12 -Tube Model Only BAND "A" (OR NO. *1) BROADCAST

Note: Refer to Figures 8 and l for location of various coils and trimmers. Refer to Figure 7 for location of padding condensers.

Connect V. T. V. M. and A. V. Ç. buss and chassis ground as described above for I. F. alignment. Turn band selector switch to Band "A" (or No. 1). Place service oscillator in operation on 1400 Kc. and connect service oscillator output lead to antenna terminal through a .0001 condenser or less or through a standard dummy antenna. It will be necessary to keep service oscillator output control well reduced during the following adjustments. Set main tuning dial of radio to 1400 Kc. and adjust trimmer "A" on oscillator poil, Figure 6. Next recheck trimmer "A" on antenna, R. F. and modulator coils to resonance, this completes alignment of band "A."

BAND '"B" (OR NO. 2)

Change band switch to band "B" or No. 2, set both service oscillator and radio dial to 4 M. C. and adjust trimmer "B" on oscillator coil to resonance. Next adjust trimmers "B" on antenna, R. F. and modulator coils each in turn to resonance. Now change both service oscillator and radio dial to 1.5 M. C. (1500 Kc.), and adjust padding condenser "BP" to resonance. Reset both service oscillator and radio dial to 4 M. C. and recheck, trimmer "B" on oscillator coil to resonance. This completes alignment of Band "B."



6 PATTERSON MODEL 128 IJIDDELS 168,268 P '1"PERSO. MODELS 198,298 ALIGNMENT BAND "C" OR NO. 3

Change band switch to band "C" or No. 3. Set service oscillator and radio dial to 12 M. C. and adjust trimmer "C" to resonance. Next adjust trimmers "C" on modulator coil rocking radio tuning dial slowly back and forth as adjustment is being made, resetting oscillator trimmer if and as necessary to keep calibration correct at this point after resonance has been reached trimmer "C" on antenna and R. F. coils may be adjusted to resonance without touching any other controls. Next set both radio dial and service oscillator to 5 M. C. and adjust padding condenser "CP" to resonance. Then reset both radio dial and service oscillator to 12 M. C. and recheck trimmer "C" on oscillator coil to resonance. This completes alignment of band "C" or No. 3.

BAND "D" OR NO. 4 Change band change switch to Band "D" set service oscillator

and radio dial to 20 M. C. and adjust trimmer "D" on modulate coil slowly rocking main tuning dial to 9 M. C. (Band D or No. 3) and adjust padding condensers "DP" to resonance. Then reset both service oscillator and radio dial to 20 M. C. and recheck to resonance, this completes alignment of Band D.

Note: When making adjustments of modulator trimmers on all models and particularly the highest frequency bands, loosening

of the modulator trimmer too far may cause a false resonance indi-

cation caused by the oscillator curve being "crossed over" remov-

ing oscillator lead or Changing oscillator frequency will readily show if this has occurred as no change in resonance indication will

be apparent also the set will be quite dead at the high frequency end of the band, the true resonance point is with the modulator screwed in about one turn or less from the point where blocking occurs. The true resonant point will be quite apparent on resonance indicating devices.

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"X" BAND OR NO. 5

(For models equipped with long wave weather band only.)

Set band change switch to "X" band. Set both service oscillator and radio dial to 400 Kc., adjust trimmer "XOT" to resonance. Then adjust trimmers "XAT," "XRT," and "XMT" each in turn to resonance. Then set both service oscillator and radio dial to 150 Kc.

and adjust padding condenser "XP" (very slowly) to resonance. Reset both service oscillator and radio dial to 400 Kc. and recheck trimmer "XOT" to resonance.

F G. 8 This completes all alignment.

Cathode Ray Oscilloscope Alignment

For the service man who is equipped with a cathode ray oscilloscope and rotary sweep circuit, a very accurate alignment of the intermediate amplifier is possible. Owners of such equipment are usually familiar with the necessary procedure as this point is usually covered thoroughly in the instructions furnished with the equipment. More detailed information than that usually furnished with cathode ray equipment may be found in John Rider's book, "The Cathode Ray Tube at Work." An I. F. output connection intended for cathode ray alignment is incorporated in all Patterson 37 models. With chassis upside down and facing back of chassis it will be found in the lower left hand corner of chassis adjacent to the phono terminals and rubber corner rest. In the 8 and 10 tube models the adjustments should be made on the second stage first, then the first stage, then through the modulator and first I. F. transformer or practically the same procedure as when aligning by any other method. The curve on the 8 and 10 should be round nosed and about 10 Kc. wide at the summit. The high fidelity switch having no effect on the resonant curve in these models. In the 12 tube model the above procedure should be followed out with the exception that the high fidelity switch must be in the "off" position during alignment.

In this model the I. F. curve will be very sharp and not round nosed, after alignment has been completed the high fidelity switch may be turned on for a check, in which position the curve will remain symetrical but become very broad with possibly a very slight shift in the I. F. frequency in some cases. If this is not the case, a misadjustment has been made in the alignment procedure and the high fidelity switch should be turned off and alignment rechecked as before.

MODELS 208,308,408 T RADIO CO. MODELS 212,312,412

continued: Align.mont,Part 2 Voltage

OPERATION OF PHONO COMBINATION MODELS

The following instructions are for models equipped with phono - pickup and motor. To place phonograph in operation turn radio on in usual manner with top coves raised. Turn toggle switch on top panel to position marked "Phono." Start motor by pulling lever extending from under turn table on right hand side forward. Lift pick up and pass over turn table toward the center of turn table, adjusting stop lever located between turn table and pickup hinge until motor turns off at a point just past when the last grooves in record stop, not including the stop grooves, which are elliptical. This point may vary with individual records while some records have no stop grooves at all. The best position for stop lever can easily be determined, however, after a few records have been tried. The speed control is located on the left hand side extending from under the turn table and is clearly marked. Use that speed which gives the best or most natural results. This speed is ordinarily 78 revolutions per minute for fast records, stroboscopes for various speeds and line frequency may be purchased for very small cost, which make it possible to obtain the exact speed. These stroboscopes are self explanatory. On those models equipped with two speed motors a third lever extends from under the turn table on which speeds are plainly marked, one being 78 R.P.M., the other 331/3 R.P.M. for slow speed records. The usual volume and tone controls are still in service and may be used at will while playing records.

VOLTAGES The following tables show characteristic voltages at various

points through a normal chassis. All Voltages Measurable Under The Following Conditions:

Transformer line tap in 110-115 V. position line voltage 115 V.

60 cycles. Band change switch set on Band No. 2. No antenna. No signal being received sensitivity adjustment set at maximum position. All voltages listed measured from point indicated to chassis (ground), all readings taken on standard 1000 ohm per volt. Volt- meter.

8 TUBE CHASSIS Screen Cathode Suppressor

90 V. App. 2 V. App. Tied to Cathode 2.5 V. App.

90 V. App. 90 V. App. 2 V. App. Tied to Cathode 90 V. App. 2 V. App. Tied to Cathode

0 V. App. 200 V. App. 15 V. App.

0 V. App. -350 V. AC Plate No. 2--350 V. AC Voltmeter only. through 500,000 ohms).

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6G5 Target -200 V. Rect. 5x3G "Plate No. 1

Measurable with AC 'Not actual, (measured

1st filter 360 V. App. 2nd filter 200 V. App.

Plate 200 V. App. 90 V. App.

200 V. App. 200 V. App. 200 V. App.

10 TUBE CHASSIS Plate Screen Cathode

RF 6K7 235 V. App. 90 V. App. 2.5 V. App. Osc. 6K7 80 V. App. 235 V. App. 0 V. App. Mod. 6L7 235 V. App. 90 V. App. 3 V. App. 1 IF 6K7 235 V. App. 90 V. App. 2.5 V. App. 2 IF 6K7 235 V. App. 90 V. App. 2.5 V. App. Det. 6Q7 55 V. App. 0 V. App. Audio 6Q7 55 V. App. Output 6F6 235 V. App. 235 V. App. 18 V. App. Output 6F6 235 V. App. 235 V. App. 18 V. App. EYE 6G5 235 V. App. 0 V. App. Rect. 5x3G Plate No. 1- -350 V. AC. Plate No. 2-350 V. AC.

`Not actual, (measured through 500,000 ohms). **Measured only with AC Voltmeter.

1st Filter Cond. 325 V. DC 2nd Filter Cond. 250 V. DC

12 TUBE CHASSIS Plate Screen

RF 6K7 250 V. App. 110 V. App. RF 6K7 250 V. App. 110 V. App. Osc. 6K7 250 V. App. 110 V. App. Mod. 6L7 250 V. App. 110 V. App. 1 IF 6K7 250 V. App. 110 V. App. 2 IF 6K7 250 V. App. 110 V. App. Det. 6Q7 Audio 6Q7 ""90 V. App. Output 6F6 325 V. App. 250 V. App. Output 6F6 325 V. App. 250 V. App. B. Osc. 6C5 '50 V. App. EYE 6G5 Target 250 V. App. Rect. 5x4G °"Plate No. 1--330 V. AC.

Suppressor Tied to Cathode Tied to Cathode Tied to Cathode Tied to Cathode Tied to Cathode

Cathode Suppressor 2.5 V. App. Tied to Cathode 2.5 V. App. Tied to Cathode

0 V. App. Tied to Cathode 3 V. App. Tied to Cathode

2.5 V. App. Tied to Cathode 2.5 V. App. Tied to Cathode

0 V. App. 20 V. App. 20 V. App.

0 V. App. 0 V. App.

Plate No. 2-330 V. AC. 'Measurable with beat oscillator switch turned on.

°Measurable only with AC Voltmeter. "'Not actual, (measured through 500,000 ohms).

1st Filter Cond. 350 V. App. 2nd Filter Cond. 235 V. App.



PIIII.C'O RADIO & TF.I.I+.V. CORP.

PHILC'O PAGE 9-) MODEL 38-15(121,124) Schematic,8ocket Tr inner s , Voltage Coils,Layout



2 PHILCO MDDEL38-15(121,124) Alignment,Specse PIIILCO RADIO & TELEV. CORP. Parts

EQUIPMENT REQUIRED: (1) Signal Generator, using a fundamental frequency range covering the tuning and intermediate frequencies of the receiver. Philco Model 077 Signal Generator which has a fundamental frequency range from 115 to 36,000 K.C. is the correct instrument for this purpose; (2) Output Meter, Philco Model 026 Circuit Tester incorporates a sensitive output meter and is recommended; (3) Philco Fibre Handle Screw Driver, Part No. 27-7059 and Fibre Wrench, Part No. 3164.

DIAL CALIBRATION: In order to adjust the receiver correctly the dial must be aligned to track properly with the tuning condenser. To adjust the dial, proceed as follows:

1. Turn the tuning condenser to maximum capacity position (plates fully meshed).

2. Holding the tuning condenser in this position, turn the pointer until it is in the position shown in Fig. 3. This is the correct position of pointer at maximum capacity of tuning condenser. FIG.3-Dial Pointer

Calibration

Intermediate Frequency Circuit Insert the signal generator shielded output lead into the "Med."

jack on the panel of the generator. Connect the other end of the output lead through a .1 mfd. condenser to the grid of the 6A7 Dèt. Osc. tube, and the ground connection of the signal generator to the chassis. Set the Signal Generator and receiver controls, and adjust the I.F. compensators as follows:

1. Set Signal Generator at 470 K.C. Turn "Multiplier" Control to 1000 and the "Attentuator" for maximum output.

2. Turn the receiver dial to 580 K.C. 3. Receiver volume control maximum. 4. Range Switch (Broadcast) 5. Adjust compensators, (15A), (14B), (14A), for maximum

output. If the output meter goes off scale when adjusting the compensators, retard the signal generator attenuator.

Radio Frequency Circuit Tuning Range 5.7 to 18.0 M.C.

1. With one end of the shielded lead of the signal generator output lead in the "Med" jack, connect the other end through a 400 ohm resistor to the white aerial wire (rear of chassis). Connect the signal generator ground to the brown lead or to the chassis of the receiver.

2. Set the controls and adjust the R.F. compensators as follows: Range Switch Signal Generator R. F. Compensators

Position and Receiver Dial in Order Short Wave 18.0 M.C. (4B)

Tuning Range 530 to 1720 K.C. 1. Remove the 400 ohm resistor from aerial lead and replace with a 100 mmfd

condenser. 2. Set the controls and adjust the R.F. compensators as follows:

Range Switch Signal Generator Position and Receiver Dial Broadcast 1550 K.C.

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4 PHILCO 143DEL 38-33(121) Socket,Trilmners Alignment,Ilotes Voltage Electrical Specifications TYPE OF CIRCUIT: Five tube. battery operated superheterodyne circuit covering

broadcast frequencies and incorporating Automatic Volume Control and a Push -Pull output stage. CABINETS AND SPEAKERS USED:

INTERMEISIATE FREQUENCY: 470 K. C.

TUNING RANGE: 530 to 1720 K. C.

POWER OUTPUT: 1 watt

TYPE AERIAL: "L" type, Philco Part No. 45-2428

Copyright 1937 Philco Radio & Television Corporation

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Cabinet Type B

F

Speaker Used L3

KR26 BATTERIES REQUIRED: "A" Battery: Two volt storage battery Philco

type 172R or Dry "A" battery Philco Part No. 41-8011. If a dry A Battery is used, a ballast lamp "type 1Y I" MUST be inserted in the socket provided in the (41-8011) battery. This lamp acts as a voltage regulator and maintains a constant potential of two volts on the filament of the tubes.

"BC" Battery: Philco battery Part No. 41-8007 is used to supply "B" and "C" voltages. This battery contains a socket into which the receiver battery cable plug is inserted.

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6 PHILCO B®DEL 38-34(125) Socket,` i1>11 er8 Alignment,Specse

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ver is de.ign4d to operate (rom a standard "L" type aerial Phiko part No. 5--12428. This aerial system should be used to obtain the maximum performance (rom the receiver. POWER SUPPLY: 6 volt storage battery-Phiko type 116R

Current driut: 1.2 amps. INTERMEDIATE FREQUENCY: 470 K. C. TUNING RANGE: 530 to 1720 K. C. OUTPUT: 1 watt

SPEAKERS USED: "B" Cabinet L-3. "F" Cabinet KR26.

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SPECIFICATIONS

TYPE OF CIRCUIT: A Five tube superheterodyne circuit covering standard broadcast and state police frequencies is used in this model. The receiver is operated by a 6 volt storage battery and uses a synchronous vibrator for supplying "B" voltage. The vibrator power unit in the type "B" cabinet is mounted on the chassis. In the type "F" cabinet the vibrator power unit is mounted under the chassis shelf and connected to the receiver through a cable and plug. Additional design features included in this model are: Automatic Volume Control; two point. tone control and Pushpull Pentode Audio Out ut Circuit.

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PHILCO PAGE 9-7

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8 PHILCO L DEL 38-35(121) Socket,Trimmers Voltage,A1 ignorent Specs,ZTotes

PHILCO RADIO & CORP.

NOTE "A"-The Dummy Antenna is a condenser connected in series with the signal generator output lead. Use the capacity specified in each step of the above procedure. NOTE "B"-DIAL CALIBRATION: In order to adjust the receiver correctly the dial must be aligned to track properly with the tuning condenser. To adjust the dial proceed as follows: 1. Turn the tuning condenser to maximum capacity position (Plates fully meshed). 2. Holding the tuning condenser in this position, turn the dial pointer until it is parallel with the INDEX LINE. See Fig. (3). This is the correct position of pointer at the maximum capacity position.

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Fig. 3 Dial Calibration. Set pointer as shown

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NOTE "A"-The Dummy Antenna is a condenser connected in series with the signal generator output lead. Use the capacity or resistance as specified in each step of the above procedure.

NOTE "B"-DIAL CALIBRATION: In order to adjust the receiver correctly the dial must be aligned to track properly with the tuning condenser. To adjust the dial proceed as follows: L Turn the tuning condenser to maximum capacity position (plate fully meshed). 2. Holding the tuning condenser in this position, loosen the dial clamp; then turn the dial until the indicator

is centered on the middle index line (See Fig. 3). Tighten clamp in this position. GLOWING BEAM INDICATOR

Copyright 1937, Philco Radio & Television Corporation Fie. 3. Dial Calibration

PHILCO PAGE 9-111.2

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ALL RANGE SWITCHES SHOWN IN

PIIILCO RADIO & TELEV. CORP.

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Fig. 5. Schematic Diagram Model 38-116, Code 125

2ND DET & MAGNETIC

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PHILCO PAGE 9-13 PAGE 9-14 PHIL('O

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PIIII,CO RADIO & 'l'I+;I.I+.". CORP.

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MODEL 38-116(125) Socket,Voltage PIIILCO RADIO & TELIX. CORP. Specs.,Notes

REQUENCY RANGES: Range One .530 to 1600 K.C. PHILCO TUBES USED: 6U7G R.F.; 6A8(. Mixer; 6A8G Oscil- Two 1.58 to 4.75 M.C. lator; 6N7G Oscillator control; two 6K7G 1. F.; 6K7G 2nd Three 4.7 to 7.4 M.C. Detector and Magnetic tuning amplifier; two 6J5G discrimin- Four 7.35 to 11.6 M.C. ator; 6J5G A. V. C.; 6R7G 1st audio; 6J5G audio driver; two Five 11.5 to'18.2 M.C. 61.66 audio output, and one 5X46 rectifier.

UNDISTORTED OUTPUT: 15 watts.

CABINET: Type XX.

Copyright 1937. Philco Radio & Television Corporation

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TONE CONTROLS: Two -1. High audio -frequency tone varied by Treble -Selectivity control. 2. Low audio -frequency tone varied by "Bass Tone Control," in the volume control circuit.

PHILCO SPEAKERS USED: One type "W5" with three -acoustic clarifiers.

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PHILCO PAGE 9-1

PHII,CO RADIO & sal ELEV. CORP.

ryï2o.cL¢C 38-116, C1- 125

Alignment of Compensators EQUIPMENT REQUIRED: (I) Signal Generator. having fundamental

freeeqquency range covering the tuning and intermediate frequencies of the receiver. Pbl$co Model 017 Signal Generator which has fundamental frequency range from 113 to 36000 K. C. is the correct instrument for this purpose; (2) Output Meter. Phlloo Model 0K Cheult Tenter incorporates sensitive output meter and is recommended; (3) Phlico Fibre Handke Screw Dryer. Part No. 27-70.39 and Fibre Wrench. Part No. 3164.

OUTPUT METER: The 026 Output Meter la connected to the plate and cathode terminals of one of the 6L6G tubes. Adjust the meter to we the (0-30) volt scale and advance the attenuator control of the generator until readable Indication is noted on the output meter after *gnat la applied to stage being adjusted.

DIAL. CALIERATION: In order to adjust the compensator, of this receiver correctly the dial must be aligned to track properly w tl t the tuning condenser. To do this proceed as follows:

I. Loosen the set screws on the shaft coupling of the tuning condenser. Then turn the tuning condenser until the plates are In the maximum cspsdty position. Now turn the dial until the glowing beam Indicator is on the Innddeex Une at the low frequency end of range 3. (See Fig. a). With the dial and tuning condenser in this position tighten set amewe.

2. Turn the tuning condenser control until the indicator is on the 4.71 M. C. mark of range 3. (See Fig. 4.)

3. With the dial in this position, loosen the shaft coupling set screws. Then turn the dial until the indicator is again on the Index Une. Tighten the set screws in this petition. Be careful when turning the dial that the position of the tuning condenser 4 not disturbed.

INTERMEDIATE FREQUENCY 1. Viewing each instrument from the front,

set the receiver and Signal Generator controls as follows:

a. Selectivity -fidelity control (clockwise) b. Volume Control at maximum (clockwise) c. Magnetic Tuning Switch (off) d. Bass Compensation Switch first position

from "Off" e. Range Switch position one (broadcast) f. Receiver dial 580 K. C. g. Signal Generator indicator set at 470

K. C. and the "Attenuator" control for maximum output.

2. Connect the Signal Generator output cable through a .1 mid. condenser to the grid 4 7 M C of the second 61(70 I. F. tube. Then adjust MARK the I. F. compensators as follows:

a. Close cgmpensator (52B) by turning to the extreme clockwise position, then pad compensator (S2A) for maximum output. Now readjust compensator (S2B) for maximum out put.

b. Connect the Signal Generator output lead through the .1 mfd. condenser to the grid of the 6A8G Mixer tube, and adjust the following compensators for maximum output: (51D), (SIC). (S1B), (S1A).

t. Repad (S2A), See Note. A Check for two equal peaks. Treble - Selectivity control in expanded position (counter -clockwise).

GLOWING BEAM INDICATOR

CIRCUIT

Fy. II. Dial CaBMstiss

RADIO FREQUENCY CIRCUIT 1. Connect the Signal Generator output cable to the "Red" and

"Blk" terminals on the aerial panel (rear of chassis). The ground connection of the cable should be connected to the "51k" terminal. Set the controls as given under "Intermediate Frequency Circuit" (a -b -c -d) and set the Range Switch, Signal Generator and Receiver Dials as given in the following procedure.

2. Set the controls and adjust the compensators for maximum output as follows:

Range Switch Position

1

5

5

4 .3

2

5 5

Signal Generator and Receiver Dials

1550 K. C. 580 K. C.

1550 K. C. 18 M. C. 18 M. C.

11 M. C. 7 M. C.

4.5 M. C. 18M.C. 18 M. C.

Compensators In Order

(36), (18B), (18A) (34) (36), (18B), (ISA) (36C) See Note C (2S), (6) Roll Tuning Con- denser. See Note B (365) (34A) (36A) (36C) See Note C (25), (6), Roll Tuning Con- denser. See Note B

MODEL 38-116(125) Aligmsnt,Tuner

NOTE "A"-Slowly shift signal generator indicator between 460 sad 400 K. C. As the indicator is turned, two peaks will he noted on the Output Meter; one about 463 K. C. and the other about 473 K. C. These peaks should give the same deflection or reading on the output meter. If the peaks are unequal, Compensator (S2A) must he slightly readjusted to the right or left (not more than Sfi of a turn) until the peaks are equalized. Each time the compensator is set In another prsltion, rotate the signal generator through the 460 or 480 K. C. range and note the reading of each peak. This adjustment is used to compensate for alight differences between Peaks If the compensator must be turned more than St of turn in either direction to equalize the peak, all paddere should he carefully readjusted as given under "Intermediate Frequency Circuit" adjustment procedure. NOTE "E"-When adjusting the low frequency compensator of Range I (Broadcast) or the antenna and R. F. compensator of the high frequency tuning range, the receiver Tuning Condenser must be adjusted (rolled) as follows: First tune the compensator for maximum output, then vary the tuning condenser of the receiver for maximum output about the frequency dial mark being used. Now turn the compensator slightly to the right or left and vary the receiver tuning condenser for maximum output. If the out reading increases, turn the compensator in the same direction trille more, and again vary the tuning condenser for maximum output. If the output decrease,, set the compensator in the opposite direction. This procedure of first setting the comnensator and then varying the tuning condenser is continued until there is no further gain in output reading. NOTE "C'-Tr, accurately adjust the high frequency oscillator compensator to the fundamental instead of the image signal, turn the oscillator compensator to the maximum capacity position (clockwise). From this position slowly turn the compensator cnurfter clockwise until a second maximum peak 4 obtained on the output meter. Adjust the compensator for maximum output using this second peak. The first peak from the maximum capacity position of the compensator is the image signal and must not be used in adjusting the compensator. If the above procedure is correctly performed, the image signal will be found (much weaker) by turning the receiver dial 940 K. C. below the frequency being used on the high frequency range.

MAGNETIC TUNING CIRCUIT ADJUSTMENT

a. Set the Magnetic Tuning switch in the "out" position (counterclockwise).

b. Volume control maximum (extreme clockwise). c. Turn Treble -Selectivity control to the Selective position

(extreme clockwise). d. Now turn the signal generator indicator to the 1000 K. C.

mark and adjust the "Attenuator" control for a weak signal. Then adjust the receiver dial for maximum output at this frequency.

NOTE: The receiver dial MUST be tuned very accurately to the 1000 K. C. signal in order to make the following adjustments correctly.

e. After adjusting the receiver dial, turn the Magnetic Tuning Switch "on".

f. Now, turn compensator (53B) slightly to the right or left (about % turn) and proceed with adjustment "g."

g. Adjust compensator (53A) primary of the discriminator transformer for minimum output; then readjust compensator (53B) secondary of discriminator transformer for maximum output.

The above adjustments are now checked for accuracy as follows:

Frequency Test:

With the 1000 K. C. signal tuned for maximum output turn the Magnetic Tuning control back and forth; that is, from the "out" to "in" position. The reading of the output meter should not change in either position. If the output meter reading changes, the above magnetic tuning circuit adjustments should be repeated.

A further check on the magnetic tuning adjustment is to very carefully tune in a broadcasting station and then turn the magnetic tuning switch front the "out" to the "in" position, With the switch in either position, the tone of the station should not change. If a change of tone or hiss develops repeat the above Magnetic Tuning Adjust men ts.

Sensitivity Test: 1. To check the magnetic tuning circuit for sensitivity, turn the

magnetic tuning switch to the "off" position, and tune in the 1000 K. C. signal. Then adjust the "attenuator" control of the signal generator for a good audible signal,-approximately 20 volts on the output meter.

2. Now detune the signal (first above and then below the 10(K) K. C. mark) to a point at which the signal is weakly heard. At each point turn the magnetic tuning control "ON". When the control la turned "ON" the signal should return to normal output strength. If the magnetic tuning circuit does not pull the signal into resonance, the primary compensator (53A) should be carefully readjusted.


l'AGE 9-16 PHILCO

MODEL 38-116(125) Trinmler s,i'arts

$.11.m. Ni. D.rMytt.n

PHILCO RAllIO & TELEV. CORP.

REPLACEMENT PARTS -Model 38-116, Code 125

Pest UM S.1ram. Patt N.. Pete N.. Dmery1Mn No.

1 Ast. Transformer (Rage I) 313615 ! Ant. Tramiormm (Range 2) 32-3616 3 Ant. Transformer (Rage 3) .. 313817 4 Ant. Transformer (Range 4) 32-3616 6 Ant. Trarfamer (Rege 6) 333619 6 Comparator (R. F.) 314064 7 Comitesv (.06 of tubular) 304519 8 R. for (51.000 U..4 watt) . 33461339 S Condenser (.06 of tubular) 30-4133

10 Condenser (10 ouf mien) . 30.1096 11 Condenser (260 pof meal 161032 12 R. F. randomize (Range 1) 33-2630 13 R. F. Tradormer (Range 2) .. . 32-3631 14 R. F. Tramforner (Range 3) 331631 16 R. F. Tradorm« (Range 4) 33-3933 18 R. F. Trendarm., (Range 6) 332634 17 Condemn, (130 rod era) .. . 361036 13 Tuning Condom., Amenably . 31-3066 11 Reamta (15.005 0. ,e watt) .. 33-316339 84 Condenser UM rf tuhuler) 30-4444

33.0703» 33.096335 364315 31470339 31-1084 30-1032 3a1a2 31»4339 33-»9339 319936 313616 32-2627 33-19!6 314100 33.010339 314300 361089 361043 33-370039 33410339 314106 30-4123 33340439 30-4123 31150331 4989PG 333103339 304315

II Remoter (700. y(t watt) 22 Rotten (85 (4 watt) 25 Condenser (.02 of tubules) 14 Rotator(700 0, 4 watt)

I Coadewr (180 rol min) r Condemner (350 rol mica) .

18 Ros.tor (99,00014 Sr watt) .

111 Roaster (941.030 ti, SS watt) 38 Ow. Tnmfoemer (Range 1) 31 Qtr. T,.dorm,. (Range 2) 31 Ow. Trsríormer (Range 3) » (tie. Tndormer (Renee 4 1 5) 34 Cowpen«tor (2 .star) 36 Relater (40 0. 4 wstt) 11 Coommppeewwtor )4 nation) .

37 Co wow (400 rod mow) 38 Condemner (40 ref vin) 38 Remita (20.00014 4 watt) M Rotator (10.000 U. 4 watt) 41 Cordova," (1300 sot .Heal 42 Condene (.06 pf tubular) 43 Resistor (40,C00 0, 1 watt) 44 Condemn, (.06 of tubular) 46 R«ator (5000, 4 watt) .

M Calderon (.1 of Bakelite) 47 Rost.. (1oteo ti, I, osti) M Condenser (.01 of tubular) M Condemn« (.1 of tubular) 304499 M R.wwtor (1.00011, te watt) 33-2)0339 M1 1. F. Espander Unit Areembl (See Note

for let and tad I. F. Traormen) 364912 3M I. F. Transformer 32-2660 Dorman. Tremolo/meet 32-2661 Condemn- (110onfmen)(Part of 63) 361031 Condenser (.5 euef mew) 30-1007 Renstor (1.0 ram.. 4 watt) 33-610339 Condemn, (1 l O oral min) 161031 Condenar (.004 tubular) 304466 Relator (1.0 leg., 4 watt) 33410039 Reeintor (2,000 ti. 't watt) 33.210339 Condemwr (.06 of tutelar) 304444 Remito« (2,00014 43 watt) 33-220339 Remota (160.000 U. t,1 watt) 33-414339 Resistor (490,00014 S, watt) 33-449339 Condemn (.1 --.1 - .7 of) 30.4637 Resistor (6.00011. 1 wan) J3.290439 Condenar (.M of tubular) 30-4444 ('ondemrr (.06 of tubular) 364518 Remote (10.00011, (, watt) 33410139 F2eetolytie ('ondetrer (6--6- 6,1) 362732 Flood Limp Bulla 34-2064 Ra,tar (2.0 met.. 4 watt) 33-620399 Ravine (2.0 mes.. 't watt) 33-120339 Remoto., i 0 men.. ' e watt) 33-310339 Reenter (1.0 mn.. ke watt) 33410339 Condemn (110 ref meal 30-1031 Condenar (110 rol areal 30-1031 Renew (490.00311. Ir watt) 33449339 Condemn (.004 rf lobuter) 30-4436 Rustir (32.00014 't watt) 33-3321139 l'ondenwr (.01 of tubule,) 304169 Condenser (.1 of tubular) 304455 Remain (51,000 (4 St watt) 33461339 Reinstor (99.000U, ,t watt) 33-399339 t oluae (ostral 33.5158 Audio Shorting Swath (Pan of Auto.

Tuner -See part& (6) end (14) Bulks un 273)

Potentiometer 335246 Remote (496000U. Ie watt) 33.449379 Relator (70,0000, 4 watt) 33470339 Rermetor (1.0 rms., 4 watt) 33410339 Condemn (.099,1 tubular) ... 304112 Condemner (.005 of tubular) 30-4112 Condenser (.02 of tubular) 364411 Remeta (330.0000, 4 watt).. 33.433339 Resto, (490.000 0, .4 oett) 33449339 A. F. C. Switch 43-1216 A. F. C. Shortin6 Switch (Pan of Auto.

Tuner- Bulletin 273) 464330 M Remito, (99.000 O. 4 watt).. 33-399339 M Condemn (.M of tubular) .. 304518 IM Remita (10.000)2, 4 watt) 33410339 181 Relator (10,00014 4 watt) . . 33-310339

60.70 143 Input Transformer 337666 .70 143 Ramalor (99,003 fl, 4 watt) 33496338 .70 1M Cosdarer (.06 rf tubular) 304518 .70 199 Cone e Vase Cell AammNy 364647 .70 199 Output Trades., 33-7751 .15 197 Cadman (J3 d tub ulsr) . 30.4491 .30 1N Condom" (.02 rf tubular) 30-4431 .20 1111 Raiser (490,000 ft. 4 watt) 33-449339 .20 III Ramer (51.0000, 4 watt) 33461339 .30 III Relator (36,0004 Si watt) 33436339 .26 11! Cobden/err (.1 of --.1 01 Bokdnte) 495500 .70 113 Field & Pot Ameeably .. $64784

1.00 114 Reactor (30 14 4 watt) .. 33430336 .N 116 Realtor (1,0054 4 watt) . 31230339 J0 113 Relator (3,n

-w0054 el aunt) 1b-324341

.70 117 Relator, wiound (40000-1.0000) 034239

.30 114 Cok .317723

.30 128 & rolytic Couder X10036

.20 Ill Ebaetrolytee Gondar., 367036

.30 112 Cosdesar (.3 st tubular) 304466

.m 113 Neevdyy ua.e Condom: (S - l0 rf) 363201

.20 114 Power Tranefrme,

.30 116 V.-6040 tithe 32-7699

.18 116 V.-3640 cyder 311700

.36 111230 V.-60.60 ryes 32-7701

.16 Is Power ! Bone Tor Notch 43-1196

.30 10 Condenser (.016-.016 rf Bskalnte) 3793DG

.10 117 Wave Switch (Ant. Paean) 43.1394 1.99 143 Wave Switch (R. F. SMion) 411335 1.60 133 Wave Switch (Ow. Section) 42.1334 1.00 Acoustic Clar4a 36-1166 1.60 Automatic Tote Meek. Complete 31.2063 .40 Bevel AwamNy (Cabiset) . . 366333 10 Reso, (Dial Meebnna) 338111 JO Cable and Plug (Floodlfgts) 414263

Gable (Power) 42183 Catie sad Plug (Speaks) 41-3336 Clamp (R. F. Unit Rev Mtn.) 364900 Clamp Ln.kueg Plate (R. F. tint) 263963 .01

(.lamp (1. F. Cad) 343147 01 Coed (I. F. Expander Drive) 27-5411 .04 Coupling

Manias Condemnor and Meg) 36-8603

Complies Meeirm) ng Comdeeoer led Dub 31-1941

Cover (Beadle of Automatie Moab.).. 366012 Dial .

274340 JO Dial Setae and Lem Bolds Am' 31-3063

Rrutcheue Ame,_bly (State. Tabs) 46-3472 Knob (Range Switch) 27-4324 .10 Knob (Tuning) 274330 .10

274331 .10 Knob (Vernier) Knob (Uar. Volume. Ropa.der WM-

se4e 27-4332 .10 Moak de (Tuning Meeka.rm) 264118 .33 Pilot Leap SwketAaNy (3 S&Mats) 366467 Shaft aid Ida Nate (Range Switch) 431303 AO

Price. Subject to Chine. without Notice

.20

.20

.40

.30

.30

.20 70 .38 .so .20

.30

.78

10.00 2.30 4.00 .t0 .20

.78

.20

.20

.20 .20 .20 .20 .70

.30

.20

.20

.20

.20

2.60 .O5

.30

.10

.1D

.20

.20

20

.20

.20

.78

.20

.26

.20 30

1.00

Ile. 6. Top View of R. F. Unit Showing Compementoe Location*

U.S slim.. Pei. No. Dissipt)ns 32.60 Shalt (I. F. Rapsodet)

.30 Shaft (Volume Control)

.20 Shield (Tube. Square) 2.60 Shield (Round 6167G) 2.00 Shield 3rd (I. F.)

.20 Shield (I. F. Rapando,) .

.30 Shield Bow (Square) 20 Shield Item (Round &NMC) J0 Smoker (M6) .20 Snek«t (7 prong. Power tub«) .40 Rork., (7 peoeg) ..

16.00 Socket (Ii .30 Seek« (Powerinnformr) .

.20 Termed Panel (Ant.) >0 .60 MISCELLANEOUS MOUNTING PARTS

1.20 Bolt (Mrs. Smoker) . W-$63 2.20 Bucbiy (Mtg. R. F. Unit) 262257 .01 1.06 Clip (Volume Shaft Front Section) 78.4394 .01 1.04 Crew (Batt of Cahieet) 27.996 .25 Felt (Mts. Speaker) 27-6499 .16

1.75 Rubber Grommet (Mtg. R. F. Unit) 27-4317 .04 Robber Buchan (Nb,. name) 27-4302 .M

7.50 Rubber Bushing (Mtg. Chute) 27.4340 12.00 Rubber Coition (Wtg. Chums) 3656 10.00 Pin (I. I. Shaft) 3014

.76 Sere. (Wng. R. F. Unit Rear Section) W-729 AO Senor (I. F. Coed Clamp). W-132.1-

1.50 Rasp Fulmer (Range SwitebCouNiu) 264279 1.50 Swum (Mtg. R. F. Unit) 27-7307 1.50 Spring (Retaining 1. F. Shaft Front 1.26 Semite) . 268610

Sony Cl,, (I. F. Shaft, Rear Sectors) 28-4117 per C .40 Wuboe-Flat-(l. F. Shaft)

-

W-174 Napkin (him. R. F. )'nit 263927 .01 Woahs-Sprang-(994. I. F. Shalt) 264154 per C .76

.M

.78

.40

Past 4M N.. Prim

766496 110.30 369091 .13 214776 .10 9006 .10 361967 369076 762725 .30 91101 .03 36-1343 27-6067 .11 27-6M7 11 77-6054 .11 77-6062 .11 384744

.,Thee Autocratie Tuning Mokemen Pane differ from tow .03 abown in Service Bulletin 273.

llat I. F. Treedermer Satan 32-2727 tad I. F. Troilism -nee Section 32-2725

(\l DI SCRIM IN

6J5G

(t^1 DISCRIMIN

6J 5G

Pie 7. Top View of I. F. Unit ShowingCompert.ator I.ocwtbas

© John F. Rider, Publisher www.americanradiohistory.com

PHILCO PAGE 9-17

PHILCO RADIO & TELEX'. CORP.

^t 4 4 4 7 ^t 0'620 f+



18 PHILO MODEL 38-620(121,125) PIIIL.CO RADIO & 'FELIX. CORP. Parts MODEL 38-690(125) Alignment,Tuner

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50 J01

DIRECTION OF ROTATION FROM REAR OF SWITCH.

2NDIF 6K7G

2ND.DET WMTE 6J5G

POWER CABLE ASSEMBLY

POWER CABLE PLUG

a BOTTOM VIEW t

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ARUN

MAG -TUN. AMP 6K7G

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POWER PLUG AUDIOPLUG SOCKET SOCKET \ / BOTTOM VIEW

SOLID AREA INDICATES R."G A REAR OF SWITCH WAFER.

SHADED AREA INDICATES PING AT FRONT OF SWITCH WAFER. ALL RANGE SWITCHES SHI WA IN POSITION NO .1 (BROADCAST) LETTERS INDICATE POSITION OF SWITCH WAFERS PROM REAR OF CHASSIS, (BOTTOM VIEW)

Model 38-890 Code 125

DMIG 1.0 MEB.

NI DRE[K-ITE-TR

400,000n

ëvo;Dóo,

I.F.= 470 KC.

AUDIO DRIVER 6F6G

AS S -AMP

SPEAKER SOCKET

2ND UDO N7G

OUTPUT -Ra1. 25,0002. 6L 6 G

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OUTPUT TRANS.

OUTPUT 6L6G

MODEL 38-690(125) Schematic ,Coils

I F-AVC 6J5G

FIELD COIL YOKE C IL

o oNKITE

I'IIILCO RAI)IO & TELEV. CORP.

NOTE "A" -Slowly shift signal generator indicator between 460 and 480 K. (' As the indicator is turned, two peaks will be noted on the Output. Meter; one about 465 K. C. and the other about 478 K. C. These peaks should give the same defleçtion or reading nn the output meter. If the peaks are unequal. Compensator 72 A must he slightly readjusted to the right or left (not more than of a turn) until the peaks are equalized. Each time the compensator is set in another position, rotate the signal generator through the 460 or 480 A. C. range and note the reading of each peak. This adjustment is used to compensate for slight differences between peaks. If the compensator must be turned more than is of a turn in either direction to equalize the peaks, all padders should be carefully readjusted as given under "Intermediate Frequency Circuit" adjustment procedure.

090®0 0000 0

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PHILCO PAGE 9-21

MODEL 38-690(125) Chassis Layouts Socket,Trinmmers

NOTE "B" -When adjusting the low frequency compensator of Range I

(Broadcast) or the antenna and R. F. compensators of the high frequency tuning range, the receiver Tuning Condenser must be adjusted (rolled) as follows: First tune the compensator for maximum output, then vary the tuning condenser of the receiver for maximum qquutput about the frequency dial mark being used. Now turn the compensator slightly to the right or left and vary the receiver tuning condenser for maximum output. If the out reading increases. turn the compensator in the same direction a trifle more, and again vary the tuning condenser for maximum output. If the output decreases, set the compensator in the opposite direction. This procedure of first setting the compensator and then varying the tuning condenser is continued until there is no further gain in output reading.

PAGE 9-22 PHILCO

MODEL 38-690(125) Parts List

Beliess. Ills. Description

1. Ant. Prans. cap 1 32-2615

3 2. Ant. Trams. ange 2 32-2616

S. pAAnntt..Tra

Tram.

emerge

5 2619

T

4 32-2618

. =air (.05 mit. tubular) 31

8. Oemdaeees (.01 mit. tubular)30.-4514 9. Resistor (5 ms 1 000 oh 1/2 watt) 33-351339 10. Register í1.Ó meg. 1/2 watt) 33-510339 11. (»MAeager (10 nnt. miles)

33:1822

0-1065 12. Condenser (2 mat. Idea) 30-10 3

13. R.!, Trans. Rang, 1 32-2 14. R.1. Traci. Range 2 32-2621 15. R.i. Trine. Reap

4 32-2622

16. 8.1. Trans. any 32-262 17. R.1. Trans. Range 5 32-26Q4 18. Condenser (.05 mt. tubular) 30-4123 19. Oond (130 mat. aloe) 30-10 6 20. Oompeneator 31-6084 21. Condenser (.05 mf. tubular) 30-4123 22. Tuning Condenser 31-2036 2 Resistor 15,000 ohms, 1/2 watt) 33-315339 24. Resistor T0 ohms, 1/2 watt 33-0 339 25.Resistor Bj ohms, 1/2 watt 33-0j85 9 26. Condenser (.05 std. tubular) 30-4444 27.Condenser (.02 std. tubular 30-4215 28 Resistor oh», 1/2 watt) 33-170339 29. Condenser

x(0250 at. aloe 30-1032 30. Condenser (250 caf. aloe) 30-1032 31. Resistor 99,000 ohms, 1/2 watt 33-399339 32. Resistor 99,000 ohms, 1/2 raft 33-3993339 33 Reglstor 20 000 obs., 1/2 watt 33-32033779 3k. Osa. Trans. Range 1 32-262 35.Ose. Trans. Range 27 32-2 36 Ose. Trans. Range 3) 32-2627 37. Ose. Trans. Range. ii & 5). 32-2628 38. Resistor (40 ohm., 1/2 watt) 33-040339 39. Compensator (2 sections) 31-6100 40. Compensator 4 sections )) 31-6200 41. Condenser 410 amt oies 30-1089 42. Condenser 40 mat mina) , 30-1095 43. Condenser 1700 Be! misa) 31-6205 44. Resistor (4,000 ohms, 1 watt) 33-240439 45. Condenser (.05 std. tubular) 30-4123 46. Resistor (10,000 ohms, 1/2 watt) 33-310339 47. let T.P. Tram. 32-2772 48. 2nd I.l. Trans 32-2293 49. 3rd I.r. Trans 32-2291

50. I.?. Expander Unit Assembly 38-4 51. Condenser (.01 elf. tubular) 30-4514 52. Resistor ( 1,000 ohms, 1/2 watt) 33-351339 53. Condenser .05 mt. tubular 30-4519 54. Oondenser .05 mf. tubular 30-4518 55. Condenser .02 t. tubular)) 30-4516 Do. Condenser .05 mt. tubular 30-4519 57. let A.V.C. I.?. Trans 32-2769 5o. Resistor 99,000 ohm, 1/2 watt) 33-399339 59. Resistor 1 mg. 1/2 watt) 33-510339 60. Resistor 330,000 oh», 1/2 watt) 33-433339 61. Condenser (.05 mf. tubular) 30-4519 2. Resistor (1.0 meg., 1/2 watt) 33-510339 63. Condenser (.001 at. tubular) 30-4453 64. Resistor ((1,000 ohm, 1/2 watt) 33-210339 65. Resistor (500 ohms, 1/2 watt) 33-150339 65x Condenser `.1 mt. tubular) 30-4455 66. Condenser ( 1 mit. tubular) 30-5499 67. Potentiometer - dual (Contains 83) 33-5241 68. Resistor 500 ohms, 1/2 watt) 33-150339 69. Resistor 500 ohms, 1 watt) 33-1213 70. 4th I.!. Trans 32-2765 71. Resistor 99,000 ohs., 1/2 watt) Part of TO 72. Resistor 99 000 ohm, 1/2 watt) 33-799339 73. Condenser (.02 f. tubular) 30-4516 74. Audld Shorting Switch - Part of Automatic tenor -

See part. (6) and (16) Service Bulletin 273) 75. Volume Control (dual) 33-5240 76. Potentiometer -((Part of 75) 77.Limiter Trans. Magnetic Tuning Circuit) 32-2767 78. Resistor (1.0 wag. 1/2 w (Part of 77) 33-510339 79. Condenser 100 mat. - Part of 77) 80. Condenser .05 at. tubular) 30-4444 81. Flood i Pilot lamp. 34-2064 82. Condenser (.03 af. tubular) 30-4449 83. Potentiometer (Part of 67) 84. A.T.C. .witch 85. Dise ris. Trans.(Nagneti Tuant 86. Condenser 110 mt. - Part of 87. Condenser 5 amt. sien) 88. Condenser .05 mt. tubular 89. Condenser .05 f. tubular 90. Resistor 2.0 neg. 1/2 w 91. Resistor 2.0 meg. 1/2 w 92. Resistor 1.0 Beg. 1/2 w 93. Condenser (.001 mt. alea

Circuit)

I.P. Expander Unit Assembly eontaine (47), (48), (49), (67), (82) and (83`

PHILCO RADIO & 'FELIX. CORP.

Mode, 38-690 - 125 REPLACEMENT PARTS

Past Be. »hem. lo. Description Part No.

94. Condenser 110 at. mica) 30-1031 95. Condenser 110 mt. mica) 30-1031 96. Condenser .0027 t. mica) 30-1096 9T 10 E.C. lter soil 32-2752 98. Resistor 1.0 msg. 1/2 ml 33-510339 99. Resistor 1.0 wag. 1/2 w) 33-510339

100. Resistor 490,000 ohm , 1/2 w) 73-449339 101. Resistor 490,000 ohms, 1/2 r) 33-449339 102. Condenser .001 mt. mica) 30-1007 103. Condenser 02 sit. tubular) 30-4516 104. Resistor (15,000 ohms, 1/2 r) 33-315339 I05. Resistor (39,000 ohms, 1/2 w) 33-399739 106. Condense! .(.05 mt. tubular) - 30-4518 107. Resister (25,000 ohms, 1/2 w) 33-2255339 108. Condenser (.1 - .1 - .7 mt.) 30-4542 109. A.T.C. shorting switch (Part of Auto. Tuner -gee

Bulletin 273) 45-2330 110. Eleetr'olytio Cond. (2-2-1-1-10 st) 30-2247 111. Resistor (51,000 ohms, 1/2 w) 33-'51339 112. Condenser (.1 mf. tubular) 30-4499 117. Resistor (490,000 oh», 1/2 w) 33-449339 114. Resistor (330,000 oh», 1/2 r) 33-433339 115. Cond 200 of mica) 30-10 7 116. Condenser .03 f. tubular) 30-4449 117. Condenser .03 f. tubular) 30-4449 118. Resistor (99,000 ohm., 1/2 w) 33-9999339 119. Condenser (.03 st tubular) 30-4449 120. Resistor (51,000 ohms, 1/2 w) 33- 51339 121. Condenser (.004 mt. tubular) 30-5331 122. Audio Bass Control and A.C. ewitob) 32-5247 123 Condenser (.00% mt. tubular) 30-4334 124. Resistor 10,000 ohms, 1/2 w) 33-310339 125. Resistor 20,000 ohms, 1/2 w) 33-320379 126. Resistor 120,000 oh», 1/2 w) 33-412339 127. Resistor 25,000 ohms, 1/2 w) 33-325339 128. Resistor 1.0 seg. 1/2 w) 33-510339 129. Resistor 800 oh», 1/2 w) 33-180339 130. Resistor 32,000 ohms, 1/2 w) 33-332339 131. Resistor 1.0 Beg. 1/2 w) 33-510339 1.32. Resistor 3,000 ohms, 1/2 w) 33-230339 133. Condenser (.01 mf. tubular) 30-5169 134. Resister (15,000 ohms, 1/2 w) 33-315339 135. Resistor (5,000 ohms, 1/2 w) 73-250339 136. Condenser (.01 ref. tubular) 30-4169 137. Resistor (490,000 ohms, 1/2 w) 33-449339 138. Condenser .1 mf. tubular 30-4499 139. Condenser (( .1 mf. tubular 30-4455 139x Condenser .1 mf. tubular 30-4455 140. Resistor 25,000 ohm, 1/2 watt) 33-325339 140x Resistor 25,000 ohms, 1/2 watt) 33-325339 141. Resistor 3,500 ohms, 1

m w 33-235339

142. Resistor 3,500 ohms, 1/2 r 33-235339 153. Resistor (2,000 ohms, 1 watt) 33-220439 144. Condenser (.005 mt. tubular) 30-4185 145. Output Trans 32-7905 146. Cone & Volee Coil Assembly (26 Speaker) 36-3647 157. Resistor (85 ohms, 1/2 w) 33-085339 148. Condenser (.25 mt. tubular) 30-4134 149. Condenser (.005 of. tubular) 30-4189 150. Cone & Voice Coil Aneably ( C B Speaker) 36-3654 151. Condenser (1 t.) 30-4538 152. Input Trans 32-7876 153. Resistor (99,000 ohms, 1/2 w) 33-39g99339 154. Condenser (.02 t. tubular) 30-4419 155. Resistor (160,000 ohm, 1/2 w) 33-816339 156. Condenser (.1 st. tubular) 30-4499 157. Resistor (890,000 ohms, 1/2 w) 33-449339 158. Resistor (1.0 Beg. 1/2 w) 33-510339 159. Condenser (.3 st. tubular) 30-4465 160. Resistor (490,000 oh», 1/2 w) 33-419339 161. Audio Cable 1-3342 162. Power Cable 41-3340 1633. Resistor ( 4 sections - wire wound) 33-3323 165. E1e trot yt lo Condenser (3-2-8 af.) 30-2249 165. Resistor (3 section. - wire wound) 30-3321 166. Field Coil, C82 Speaker 36-3995 167. Choke 32-7115 168. Condenser (.15 mit. bajnolite) 628750 169. Electrolytic Condenser (8-10 of.) 30-2201 170. Eleotrolytio Condenser ( 8 st.) 30-2025 171. Field (r6 speaker) 36-3782 172. Field (C82 speaker, (Sus as 166) 173. Electrolytic Condenser (18 st.) 30-2200 174. Condenser (.2 mt. tubular) 30-4536

42-1216 175. Chet* 32-7056 32-2661 176. Electrolytic Condenser ( 8 of.) 30-2025

177. Electrolytic Condenser ` 8 mit.) 30-2025 30-1097 178. Power Transformer 115 - 60 cycles) 32-7898 30-4519Power Transformer 115 -25 to 80 cycles) 32-7889 30-4444Power Transformer 115-230 - 60 cycles) 32-7890 33-520339 179. Power Transformer 115 V-60 cycles) 32-7885 33-520339 Power Transformer (115-25 to 80 cycles) 32-7886 33-510339 Power Transformer 115-230V - 60 cycles 32-7887 30-1007 180. Condenser (.015 at. - .015 .f. bakelite 3793110

181. lave Switch 42-1354 182. lave Switch R.T 42-1355 183. wars Switch Ose. 52-1356



PHILCO PAGE 9-23

r-

MODEIS 38-22,38-23(121) PHIL.CO HAl)IO & 'l'EL,EV. CORP. Schematic,Coils

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May, 1937

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Speaker Model

HR -2l 38-23 KR -28 38-22 KR -27 38-23 HR -2l 38-23 HR -22 38-22 KR -28 38-22

FOR CONE -CENTRIC TUNING MECHANISM-MODEL, 22

Complete information for setting the stations on the cone -centric tuning mechanism of Model 38-22 is covered in the instruction Part No. (39-5533B) which is supplied with each set.

A few major aaaemblies of the automatic cone -centric tuning mechanism are listed on page 3 of this bulletin. A complete list of replacement parts, however, and detailed service data for the automatic mechanism, will be found in bulletin 282.



PHILCO PAGE 9-25

23.IDDL'LS 38-22,38-23(121) PHILCO RADIO & TELEV. CORP. Voltage,Socket,Trimmers

Tuner,Parts REFLECTOR

STOPS

SELECTOR ARM

KNOB KNOB VERNIER

KNOB SELECTOR

WRENCH

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F'AGE 9-26 PHILCO MODEL 920 Sahematio,Parts Chassis Layout

ANT.

PHILCO RADIO & TELEX. CORP.

/ DET-OSC. 6A7

I.F.=260 KC. 42 22

AT- P`ATE

_VVVV VVVVV

CONOENSCR 8µl

NOTE. THIS SIDE Or A 1 1

BATTERY GROUNDED TO CASE. (FRAME OF CAR)

MODEL 920 PARTS LIST

No. Description Part No.

Antenna Transformer 32-2988 Condenser (50 mmfd.) 30-1101 Tuning Condenser 31-2224 First Padder (on l'un. Cond )

R. F. Transformer 32-2986 Second Padder (on Tun. Cond.) Condenser (.05 mfd.) 30-4020 Resistor (70,000 ohms) .33-370344 Third Padder (on Tun. Cond )

Oscillator Transformer 32-2987 Resistor (99,000 ohms) ..33-399344 Low Fequency Padder 31-6252 Padder (Pri. 1st I. F. Trans )

First I. F. Transformer 32-2994 Padder (Sec. 1st I. F. Trans.) Condenser (.05 mfd.) 30-4020 Padder (Pri. 2nd I. F. Trans.) Second I. F. Transformer 32-2995 Padder (Sec. 2nd I. F. Trans.) Condenser (110 mmfd.) 30-1031 Condenser (410 mmfd.) 30-1089 Volume Control & Switch Assem.

(350,000 ohms) 33-5269 Resistor (20,000 ohms) ..33-320344 Resistor (450 ohms) ....33-145341 Condenser (.01 mfd.) 30-4479 Resistor(1,000,000 ohms) 33-510344 Condenser (.25 mfd.) 30-4448 Resistor) 1,000,000 ohms) 33-510344 Resistor) 1,009,000 ohms) 33-51034-1 Resistor (211,000 ohms) ..33-320447

gCondenser 1.05 mfd.) 30-4500 Resistor (0.000 ohms) ..33-260344 Resistor (2411.000 ohms) ..33-424344 Condenser (.01 mfd.) 30-4145 Resistor (490,000 ohms) 33-449344

g Resistor (240,000 ohms) 33-424344 e Condenser (.1 mfd.) 30-4409 Condenser (.01 mfd.) 30-4381

e © o o o o o o o D QI t, z. D

db .T.

D .L

.,

FEBRUARY 15, 1938

PHILCO MODEL 920

Lf. 78

1.000 000n

FIGURE 1


Output Transformer 32-7961 Cone & Voice Coil Assembly 45-1344 Field Coil 32-9484 "A" Choke 32-1644 Filament Choke 32-1644

a Pilot Lamp 34-206! Condenser (.5 mfd.) 30-4551 Vibrator Choke 32-3003 Condenser (.5 mfd.) 30-4565 Vibrator 41-3395 Resistor (200 ohms) ....33-120394 Power Transformer 32-7962 Condenser (7,500 mmfd.) 30-4567

s Filter Condenser (4-4 mfd.) 30-2311 Filter Choke 32-7960 Resistor (60 ohms) 33-060331 Condenser (250 mmfd.) ....30-1032 Tuning & Volume Knob ....27-4737 Pointer 28-5781 Dial & Bracket Assembly 42.5844 Glass 27-9107 Bezel 28-5764 Housing Cocer 38-9505 Four Prong Socket 27-6044 Five Prong Socket 27-6035 Six Prong Socket 27-6036 Seven Prong Socket 27-6037 Fuse 7227 Fuse Insulator 27-7729 Carriage Bolt SV -1983 Radio Mtg. Bolt W-1984 Radio Mtg. Nut W-55 Radio 511g. Nut W-1687 Distributor Resistor 3:1-1190 Interference Condenser 30-4007 Set Mounting Bracket

(short) 28-5853 Set Mounting Bracket

(long) 28-5744

84TUBE RECTIFIER

2ND.DET. 1ST. AUDIO 34

75 .01 1 f 1

OUTPUT 41

IVVVV- 3750. óon

.0 0 © 2"DDET. 2 30 78TFBE DET OS

tsT AUD 0 _o®mo m0m ©® 11 1 ' 41111 -Ì11

'V-I'47-OR. 0 A' LEAD RECEPTACLE

Flaunt 2

TONI G CONTROL

VOLUME CONTROL

ANTENNA RECEPTACLE



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PHILCO PAGE 9-27

PHILCO RADIO & 'rELEV. CORP. moDELS 921,922(Run 2I)

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PAGE .9-28 PxILCQ.

O o o o o o o o o D m .s1

o

MODELS 921,922(Run2 Sohenatio,Parts Chassis Layout

ANT.

PIIILCO RADIO & TELEV. CORP.

MODELS 921 and 922 (Run No. 2)

DET-OSC 7 / 6A7

,/(5) fi E //Ipp

gilt OHe tp 2 T cr

rl _Z astir

tAo

O .syfy esouvr

NOTE. 1_gIIT ICJ THIS SIDE PLATE 00N0ENSER OF íA GATTE Rr GROUNDED TO CASE (FRAME OF CAR)

o. Description Antenna Choke Condenser (.01 MN.)

Esovyl .atif

e)-."

PARTS LIST

I.F 78

Ftctrnr; 1


Part No. ® Resistor (2,000,000 ohms) 33-520344 77-0050 6 Resistor (490,000 ohms) 33-449344 30-44ï9 Resistor (240,000 ohms) 33-424344

Tuning Condenser 31-2288 First Fodder (on Tun. Cond )

Antenna Compensator 31-6260 Resistor (330,000 ohms) 33-433344 Condenser (.05 mfd.) 30-4519 Condenser (250 mmfd.) 30-1032 Resistor (99,000 ohms) .33-399344 Condenser (250 mmfd.) 30-1032 Second Padder (on Tun. Cond.) Condenser (12 mmfd.) 61-0007 Oscillator Transformer 32-3025 Condenser (.1 mfd.) 30-4455

G) Resistor (25,000 ohms) 33-325544 gCondenser (250 mmfd.) 30-1032

a Padder (Prl. 1st I.F. Trans )

First I. F. Transformer 32-3074 Padder (Sec. 1st I.F. Trans )

Resistor (2,000,000 ohms) 83-520344 Second I. F. Transformer 32-3076

á) Padder (Sec. 2nd I. F. Trans.) ® Condenser (110 mmfd.) .30-1031

. Resistor (51,000 ohms) ..33-351344 ®® Condenser (110 mrefd.). 30-1031

Volume Control (500,000 ehme) and On -OR Switch 33-5278

e Condenser (.01 mrd.) 30-4479 Condenser (.1 mfd.) 30-4499 Resistor (4,000,000 ohms) 33-540344

Cone and Voice Coil Field Coil Pilot Lamp Condenser (.5 mfd.) 30-4491 Condenser (250 mmfd.) 30-1032 "A" Choke 32-1644 Filament Choke 32-1644 Condenser (250 mmfd.) 30-1032 Vibrator Choke 32-300:1 Condenser (.5 mfd.l 30-4565 Vibrator 41-3398 Resistor (200 ohms) ....33-120344 Power Transformer 32-7962 Condenser (7500 mmfd.) 30-4567 Condenser (250 mmfd.) 30-1032 Filter Choke 32-7960 Filter Condenser (4-4 mmfd.) 30-2329 Tuning and Volume Knob 27-4761 Pointer 28-5969 Fuse 7227 Fuse Insulator 27-7729 Glass 55-0020

Resistor (490,000 ohms) 33-449344 Resistor (240,000 ohms) 33-424344 Condenser (.1 mid.) 30-4499 Condenser (.01 mid.) 30-4501 Output Transformer 32-8000

45-2707 Not replacable

34-20114

JUNE 1938

2ND. DET IST AUDIO

75 OUTPUT 9 4)

oisyr.

4vF 4tiF

d806006k- 175n

I.F = 470 K.C.

84TUBE 53 41TUBE RECTIFIER OUTPUT

ß 7

(D4*, ED ®36©29

VIBRATOR

75TUBE 2M0 DET. I^ DI

ID

6A7 TUB DET.OSC

PUSH-BUTTON TUNING LOCKING SCREW CONTROL,

1 ,

O e Q 0 10 "O H aN-OFF"SWITC ® O VOLUME CONTROL ,NT CONNECTOR

FIGURE 2

BASE VIEW OF MODEL 922

Model 921 similar except there is no provision for automatic tuning

78TUBE I F.

Antenna Transformer 32-3037 Condenser (.015 mad) ....30-4226



PHILCO PAGE 9-29 MODEL 926

x~41>

V 1


MARCH 1, 1938

ids o Hu a

>7N11/I7

a W g7.Q B4TUBE F-0 RECTIFIER

No. ©

Sohema.tio Chassis,Parts

10 ANTENNA RECEPTACLE

4ITUBE &A-7 TUBE

OUTPUT © DET OSC.

FIaoxE 2

K.C.

MODEL 926 PARTS LIST Description Part No.

Antenna Compensating Condenser 31-6248

Condenser (50 mmfd.) 30-1101 Antenna Transformer 32-2945 Tuning Condenser 31-2238 First Padder (on Tun. Cond )

Condenser (.05 mfd.) 30-4444 R. F. Transformer 32-2948 Second Padder (on Tun. Cond.) Resistor (70,000 ohms) ..33-370344 Condenser (6000 mmfd.) :.30-4467 Condenser (.05 mfd.) 30-4020 Condenser (.25 mid.) 30-9448 Third Padder (on Tun. Con )

Oscillator Transformer 32-2947 Condenser (110 mmfd.) 30-1031 Low Frequency Padder 31-6220 Resistor (99,000 ohms) ..33-399344 Resistor (70,000 ohms)..13-370344 Condenser (.05 mfd.) 30-4020 Resistor (25,000 ohms) 33-325344 Padder (Pri. 1st. I. F. Trans.) First I. F. Transformer 32-3013 Padder (Sec. 2nd 1. F. Tans.) Resistor (1,000,000ohms) 33-510344 Padder (Pri. 2nd I. F. Trans.) Second I. F. Transformer 32-3014 Padder (Sec. 2nd 1. F. Trans.) Condenser (110 mmfd.) 30-1031 Condenser (250 mmfd.) 30-1032 Resistor (25,000 ohms) ..33-325344 Resistor (330,000 ohms) 33-433344 Condenser (.01 mid.) 30-4479 Volume Control (1,000,000 ohms)

and "On -OR" Switch 33-5268 Resistor (1,000,000 ohms) 33.510344 Resistor (1,000 ohms) -.33-210344 Resistor (600 ohms) ..33-160331 Resistor (20,000 ohms) ..33-320344 Resistor (32,000 ohms) ..33-332444 Resistor (250,000 ohms) .33-424344 Condenser (.1 mfd.) 30-4122

No. Description Part No. Resistor (250,000 ohms) 33-424344 Resistor (500,000 ohms) 33-449344 Condenser (.01 mid.) 30-4145 Condensers (250 mmfd.) 30-1032 Condensers (4,000 mmfd.) 30-4185 Condensers (.05 mid.) 30-4454 Resistor (10,000 ohms) ..33-310344 Output Transformer 32-7958

íßc Cone and Voice Coll 45-2608 Field Coil Assembly 32-9263 Pilot Lamp 34-2040 Condenser (250 mmfd.) 30-1032 Condenser (.25 mid.) 30-4448

1i

"A" Choke 32-1374 Condenser (250 mmfd.) 30-1032 Vibrator Choke 32-2911 Condenser (.5 mid.) 30-4474 Vibrator 41-3170-3 Resistor (200 ohm) 33-120344 Resistor (150 ohms) 33-115344 Power Transformer 32-7958 Condenser (7500 mmfd.) 30-4587 Filter Choke 32-7959 Filter Condenser (4-4 mfd.) 30-2315 Resistor (120 ohms) ....33-112326 Reception Control 42-5850 Antenna Choke 32-1956 Complete Control 42-5840 Tuning Shaft 28-8871 Tuning and Volume Knob 27-4725 "Carline" Knob 27-4731 "Music" Knob 27-4732 "Speech" Knob 27-4733 Dial 27-5399 Fuse 7227 Fuse Insulator 27-7729 Distributor Resistor 33-1196 Interference Condenser 30-4007 "T" Bolt 28-6161 Washer W-2606 Nut W518

©John F. Ridere Publisher www.americanradiohistory.com

30 PHILCO MJDEIS 926,927,928K PHILCO RADIO & TELEV. CORP. Standard Controls Details,Parts



PHILCO PAGE 9-31

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MARCH 2, 1988

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PHILCO MODEL 927

0>H 3 33d S

MODEL 927 Sohematic,Parts Chassis Layout

Q ,5 0 SVIBRATOR O78R F9E® 10 12 17 OANTENNA RECEPTACLE

Ir!J i'.rO%O©ou -.

14 41 U: jr

RECTIFIER OUTPUT 2cc DEI 78TUBE 4 TUB ISTAUDIO I.F©OUTPUT®

"Speech" Knob Dial Fuse Fuse Insulator Distributor Resistor

FIGURE 2

27-4733 27-5399

7227 27-7729 33-1196

ANTENNA COMPENSATING CONDENSER

VOLUME CONTROL RECEPTACLE

6-A-7 TUBE DET.OSC.

Interference Condenser 30-4007' "T" Bolt 28-6161 Washer 28-2606 Nut W-518

I.F:= 260 K.C.

MODEL 927 PARTS LIST No. Description Part Ne.

Qr Antenna Choke 32-1956 re Condenser (50 mmfd.) 30-1101

Antenna Compensating Condenser 31-6248

Antenna Transformer 32-2945 Tuning Condenser 31-2241 First Padder (on Tun.' Cond.) Condenser (.05 mid.) 30-4444

® Condenser (.25, .25, .5, .5, 2 mfd.) 30-4568

® Resistor (600 ohms) ....33-160431 Q R. F. Transformer 32-2946 50 Second Padder (on Tun. Cond.)

Resistor (70,000 ohms) ..33-370344 Condenser (6,000 mmfd.) 30-4467 Thermal Comp. Condenser 31-6253 Third Padder (on Tun. Cond.)

gOscillator Transformer 32-2947 Condenser (110 mmfd.) 30-1031 Low Frequency Padder 31-6230

iResistor (09,000 ohms) .33-399344 Resistor(1,000,000 ohms) 33-510344 Resistor (25,000 ohms) .33-325344 Padder (Pri. 1st I. F. Trans.)

CD First I. F. Transformer 32-3013 6 l'adder (See. 1st I. F. Trans.)

Padder (Pri. 2nd I. F. Trans.) Second 1. F. Transformer 32-3014 Padder (See. 2nd I. F. Trans )

Condenser (250 mmfd.) 30-1032 ® Resistor (330,000 ohms) 33-433344 ®® Resistor (25,000 ohms) ..33-325344

Condenser (.01 mfd.) 30-4479 ® Volume Control(1,000,000 ohms)

& On -OR Switch 33-5268 Resistor (600 ohms) ....33-160431 Condenser (.01 mfd.) 30-4479 Resistor (20,000 ohms) ..33-320344 Condenser (.01 mfd.) 30-4479 Resistor (25,000 ohms) ..33-325444 Resistor (4,000 ohms) ..33-240444

No. Description Part No. eResistor (240,000 ohms) .33-424344 Condenser (250 mmfd.) 30-1032 Condenser (.01 mfd.) 30-4145

fe Resistor (490,000 ohms) 33-449344 Resistor (240,000 ohms) 33-424344 Resistor (490,000 ohms) 33-449344 Condenser (.05 mid.) 30-4454 Resistor (3,500 ohms) ...33-235344 Condenser (4,000 mmfd.) 30-4185 Condenser (.03 mfd.) 30-4560 Output Transformer 32-7967 Cone & Voice Coil 45-2653 Field Coil 32-9493 Condenser (.5 mid.) Part of ® Resistor (500 ohms) 33-150344 Choke 32-1372 Condenser (.15 mid.) 30-4571

Q)

Resistor (3,500 ohms) ..33-235344 Condenser (250 mmfd.) 30-1032

e Reception Control 42-5850 ® Pilot Lamp 39-2040 Q Condenser (250 mmid.) 30-1032

ZCondenser (.5 mfd.) 30-4474 "A" Choke 32-1374

(e Condenser (250 tumid.) ... 30-1032 6Vibrator Choke 32-2537

3 Condenser (.5 mid.) 30-4474 ® Vibrator 41-3170-3 Q Resistor (200 ohms) 33-120344 ® Resistor (150 ohms) 33-115344

Power Transformer +

Condenser (7,500 mmfd.) 30-4567 Filter Choke 32-7822 Filter Condenser (4-8 mid.) 30-2316 Condenser (250 mmid.) 30-1032 Condenser (250 mmfd.) 30-1032 Complete Control 42-5840 Tuning Shaft 28-8871 Tuning & Volume Knob 27-4725 "Car -line" Knob 27-4731 "Music" Knob 27-4732



32 PHILCO

MODEL 927 MODEL 928K Socket ,Trimmers Alignment

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IF=260KC

MODEL 928-K PARTS LIST

Description Part No. Antenna Choke 32-1956 Condenser (50 mmfd.) 30-1101 Antenna Compensating Condenser 31-6248

U Antenna Transformer 32-2945

s Tuning Condenser 31-2242 ® First Padder (on Tun. Cond.)

Condenser (.05 mfd.) 30-4444 ® Condenser

(.25-.25-.5-.5-2 mfd.) 30-4568 Resistor (600 ohms) ....33-160331 R. F. Transformer 32-2946 Second Padder (on Tun. Cond.) Resistor (70,000 ohms) .33-370344

13 Condenser (6,000 mmfd.) 30-4467 ® Thermal Comp. Condenser 32-6232 9 Third Padder (on Tun. Cond )

® Oscillator Transformer 32-2947 ® Condenser (110 mmfd.) 30-1031 Oti Low Frequency Padder 31-6230 O Resistor (99,000 ohms) .33-399344 ®o Resistor(1,000,0011 ohms) 33-510344 ®® Resistor (25,000 ohms) .33-325344

Padder (Pri. 1st I. F. Trans.) First I. F. Transformer 32-3013

® Padder (Sec. 1st I. F. Trans )

e,

Padder (Pri. 2nd I. F. Trans )

Second I. F. Transformer 32-3014 O Padder (Sec. 2nd I. F. Trans )

® Condenser (250 mmfd.) 30-1032 ® Resistor (330,000 ohms) 33-433344

Resistor (25,000 ohms) .33-325344 Condenser (.01 mfd.) 30-4479 Volume Control (1,000,000 ohms & On -0H Switch) 33-5268 Resistor (600 ohms) ....33-160331 Condenser (.01 mfd.) 30-4479 Resistor (20,000 ohms) .33-320344 Condenser (.01 mfd.) 30-4479 Resistor (25,000 ohms) .33-325444 Resistor (4,000 ohms) ..33-240444 Resistor (240,000 ohms) 33-424344

+a Condenser (250 mmfd.) 30-1032

o Ilt

MARCH 3, 1938

PHILCO MODEL 928-K

20000n

No. Description Part No. ® Condenser (.01 mfd.) 30-4145 ® Resistor (490,000 ohms) 33-449344

Resistor (240,000 ohms) 33-424344 Resistor (490,000 ohms) 33-449344 Condenser (.05 mfd.) 30-4454 Resistor (3,500 ohms) .33-235344 Condenser (4,000 mmfd.) 30-4185 Condenser (.03 mfd.) 30-4560 Output Transformer 32-7968 Choke 32-1374 Condenser (250 mmfd.) 30-1032 Cone & Voice Coil 45-2664 Field Coil 32-9493 Condenser (250 mmfd.) 30-1032 Choke 32-2535 Pilot Lamp 34-2040

O Condenser (250 mmfd.) 30-1032 A Condenser (.3 mfd.) 31)-4474 ® "A" Choke 32-1374 Ci Condenser 1250 mmfd.) 30-1032

Choke 32-1374 8 Condenser (350 mmfd.) 30-1032 te Vibrator Choke 32-2537

Condenser (.5 mfd.) 30-4474 Vibrator 41-3170-3 Resistor (200 ohms) 33-120344

t Resistor (150 ohms) 33-115344

O Power Transformer 32-7951 ® Condenser (7,500 mmfd.) 30-4567 O Filter Choke ... 32-7959

Filter Condenser (4-8 mfd.) 30-2316 Condenser (250 mmfd.) 30-1032 Resistor (500 ohms) ....33-150331 Choke 32-1372 Resistor (3,500 ohms) ..33-235344 Condenser (250 mmfd.) 30-1032 Condenser (.15 mfd.) 30-4571 Reception Control 42-5850 Complete Control 42-5810 Tuning Shaft 28-8871 Tuning & Volume Knob 27-4725 "Car Line" Knob 27-4731 "Music" 27-4732

I UB RECTIFIER OUTPUT

2ND.DET. 1ST. AUDIO

7.

ls000n 4000n

RECTIFIER 84)

IBR ' O

(9 3 (2 e Fi' -

pm -111 I

PHILCO PAGE 9-33

OUTPUT 41

78TUBEiel ® R.F

rain t F, ; aeod®Qo 'v'- 0 IÌ* AUDIO

el"-Ser

MODEL 928K Sohematic,Parts Chassis Layout

ov V° 9v

Z V W J J R Ñ ï a

V

00

"Speech" 27-4733 Dial 27-5399 Fuse 7227 Fuse Insulator 27-7729 Distributor Resistor :13-1196 Interference Condenser 30-4007 "T" Bolt (Rec. Mtg.) 28-6161

ANTENNA RECEPTACLE

ANTENNA COMPENSATING CONDENSER

VOWME CONTROL RECEPTACLE

IV

4 TUB 6A-7-11.)8EOUTPUT

19 DET.OSC.

Washer (Rec. 511g.) 28-2606 Nut (Rec. Mtg.) W-518 Bolt (Speaker Mtg.) 6122 Nut (Speaker Mtg.) W -55A

©John F. Rider. Publisher www.americanradiohistory.com

34 PHILCO MODEL N1514(Nash) Schematic,Parts PHILCO RADIO & TELEV. CORP.

Chassis Layout NASH - PHILCO MODEL- N-1514 SINGLE UNIT RECEIVER

ANT 2No.DET.

ANTENNA COMPENSATING

CONDENSER

DET. OSC. A7

o ¡166 o v

W00,000l1

2501ÄH

±AO=-ò

NOTE:- THIS SIDE OF A BAT TERY GROUNDED TO CASE

FRAME OF CAR)

OCTOBER 20, 1937

FOR ALIGNIENT, SEE INDEX ter

No. Description

99.0001'

51'f

,son -A vwvv+L VIBRATOR PT. NO. 41-3170- 2

MODEL N-1514 PARTS LIST Part No.

0 Antenna Choke 32-1956 ® Condenser (.05 mfd.) 30-4444 ® Antenna Transformer 32-2516 ® Toning Condenser 31-1930 © First Fodder (on Tun. Cond.) ® Antenna Compensator 31-6082 ® Resistor (70,000 ohms) ..33-370344 ® Condenser

(.01-.1-.25-.25-.5 mfd.) 30-4511 ® Resistor (450 ohms) 33-1218

R. F. Transformer 32-2307 u Second Padder (on Tun. Cond.) ® Resistor (70,000 ohms) ..33-370344 © Condenser (765 mmfd.) 30-1069 O Condenser (.05 mfd.) .3615-0SG ® Resistor(1,000,000 ohms) 33-510344 ®Third Padder (on Tun. Cond )

93 Oscillator Transformer 32-2308 ® Condenser (250 mmfd.) 30-1032 93 Resistor (99,000 ohms) ..33-399344

i31-6Low Frequency Padder 102' Resistor (45,000 ohms) ..33-345344 Padder (Pri. 1st I. F. Trans.)

93 First I. F. Transformer 32-2026 e Padder (Sec. 1st T. F. Trans )

g Padder (Pri. 2nd I. Ir. Trans.) g Second I. F. Transformer 32-2027 3 Padder (Sec. 2nd T. F. Trans.) 1g Condenser (250 mmfd.) 30-1032 t3 Resistor (25,000 ohms) ..33-325344 g Condenser (110 mmfd.) 30-1031 e Condenser (.01 mfd.) ....3903 -OSI) g Volume Control

(350,000 ohms) 33-5139 9 Resistor (32,000 ohms) :.33-332434 93 Resistor (20,000 ohms) ..33-320344 93 Resistor (600 ohms) 33-1212 93 Resistor (1.000,000 ohms) 33-510344 g Resistor (240.000 ohms) .33-424344 54 Condenser (210 mmfd.) . 30-1032 ® Condenser (.01 mfd.) ...3903-OSU

Resistor (490,000 ohms) 38-449344 1 Resistor (240,000 ohms) 33-424344 9 Condenser (4.000 mmfd.) 30-4185

ar?j. Output Transformer 32-7495 9i Cone & Voice Colt 36-3586

I . F.

78

32. oson.

B

IsTA U DI O

\ RECTIFIER'

VIBRATOR PT. NO. 413170-3

No. - Description Part No. 93 Field Coil 32-9236 84TUBE ® On & OIT Switch 42-5617 RECTIFIER

© Pilot Lamp 34-2040 r ® Condenser (250 mmfd.) 30-1032 Q Condenser (.5 mfd.) 30-4015 ® "A" Choke 32-1004 ..-- g) Condenser (25Ò mmfd.) 30-1032

Filament Choke 32-2039 O ® Vibrator Choke 32-2535 B Condenser (.5 mfd.) 30-4015 ® Condenser (.05 mfd.) 30-4414 ® Resistor (20 ohms) 33-020344 Q Power Transformer 32-7550

Condenser (7,500 mmfd.) 30-4420 ® Filter Choke 32-7545 eo Filter Condenser (4-8 mfd.) 30-2150 el Condenser (250 mmfd.) 30-1032 ® "B" Choke 32-1281

..41-31770-2

..41-3170-3 ® Condenser (.02 mfd.) 30-4419 (c3,ß Tone Control Switch 42-1145-2 ® Condenser (.01 mfd.) 3903 -USC

Receiver Housing 38-9230 Four Prong Socket 27-6044 Five Prong Socket 27-6035 Six Prong Socket 27-6036 Seven Prong Socket 27-6037 Tuning Control Shaft 28-8815 Volume Control Shaft 28-8816 Tone Control Shaft 28-8817 Tuning & Volume Knob 27-4690 Knob 27-4639 Knob Base 28-4184 Gland Nut 28-6558 Scale Assembly 42-5792 Fuse 7227 Fuse Insulator 27-7729 Tee Bolt (Rec. Mtg.)

Side 28-6161 , Bottom 28-6268 55 53 '71'

Nut (Rec. Mtg.) W518 LEAD 15TUBE

Distributor Resistor 33-1196 58 VIBRATOR 49"o'.DEL. Interference Condenser 30-4007 IsTAUDIO

O

® Vibrator (OPTIONAL)

Interference Condenser 30-4307 Interference Condenser 30-4663

OUTPUT ºso HI. f 41

/ J IJ 4.orf a.orf 400n

1.r=260 KC

® 0 52 21 DÉT0RF BE Ö5C.,

51

36 29 OUTPUT

FIGURE 2

nouas 1

ANTENNA COMPEN5ATOR

I9

® OBTIF, USE'®

VOLUME CONTROL

'TUNING CONTROL



PHILCO PAGE 9-3e

A NT

a 0.

Pf


6

47

o NOTE- THIS SIDE OF A. BAT TERV -L

GROUNDED TO CASE (FRAME OF CAR)

PHILCO RAllIO &

STUDEBAKER - PHILCO MODEL-

DET. OSC.

í66 --PVf

~AA/ L000.0000

=2s0pf f \/

NOVEMBER 1937

r-: -- ss -11

i301i -vnn,,w r VIBRATOR PT NO. 41-3170- 2

MODEL S-1516 PARTS LIST No. Description Part No. ® Antenna Choke 32-2344 ® Condenser (.05 mfd.) 30-4444 ® Antenna Transformer 32-2516

Tuning Condenser 31-1930 First Padder (on Tun. Cond.)

® Antenna Compensator 31-6082 O Resistor (70,000 ohms) ..33-370344 ® Condenser

(.01-.1-.25-.25-.5 mfd.) 30=4511 ® Resistor (450 ohms) 33-1218 O R. F. Transformer 32-2307 u Second Padder (on Tun. Cond.) ® Resistor (70,000 ohms) ..33-370344 lI Condenser (765 mmfd.) 30-1069 I+ Condenser (.05 mfd.) 3615-080 Q Resistor(1.000,000 ohms) 33-510344

+o Third Padder (on Tun. Cond )

G Oscillator Transformer 32-2308 A Condenser (250 mmfd.) 30-1032

D Resistor (99,000 ohms) '..33-399344 ® Low Frequency Padder 31-6102 3) Resistor (45,000 ohms) 33-345344

Padder (Pri. 1st I. F. Traie.) } First I. F. Transformer 32-2026

h Padder (Sec. 1st I. F. Tram ) Padder (Pri. 2nd I. F. Trans )

ág Second T. F. Transformer 32-2027 3 Padder (See. 2nd I. F. Trans ) A Condenser (250 mad.) 30-1032

Resistor (25,000 ohms) ..33-325344 Pl Condenser (110 mmfd.) 30-1031 g Condenser (.01 mfd.) ....3903-0311 4 Volume Control

(350,000 ohms) 33-5189 A Resistor (32,000 ohms) ..33-332434 A Resistor (20,000 ohms) ..33-320344 PP Resistor (600 ohms) 33-1212 t Resistor(1.000,000 ohms) 33-510344 (ta Resistor (240.000 ohms) 33-424344 A Condenser (250 mmfd.) 30-1032

+A Condenser (.01 mfd.) ....3903 -Osti

1

rI'ELEV. CORP.

S-1516 SINGLE UNIT

MJDEL S1516(Studebaker) Schematic *Parts Chassis Layout

RECEIVER

2No.DET. I.E. IsTA UDIO 7 7 150PPf

32 00011

B

VIBRATOR PT. ND. 41-3170-3

No. Description Part No. . Resistor (490,000 ohms) 33-449344

Resistor (240,000 ohms) 33-424344 Condenser (4,000 mmfd.) ..30-4185

® Output Transformer ® Cone & Voice Coil ® Field Coil

On & Off Switch Pilot Lamp

32-7495 36-3586 32-9236 42-1368 34-2040

® Condenser t250 mmfd.) . 30-1032 ® Condenser (.5 mfd.) 30-4015

"A" Choke 32-1604 ®i Condenser (250 mmfd.) 30-1032 ® Filament Choke 32-2039 ® Vibrator Choke 32-2535 ® Condenser (.5 mfd.) 30-4015 153 Condenser (.05 mfd.) 30-4444

e Resistor (20 ohms) 33-020344 Power Transformer 32-7550 g Condenser (7,500 mmfd.) 30-4420 p Filter Choke 32-7545

Ed Filter Condenser (4-S mfd.) 30-2150 O Condenser (250 mmfd.) 30-1032 ® "B" Choke 32-1281 ® Vibrator (OPTIONAL) .41-3170-2

..41-3170-3 ® Cortfienser (.01 mfd.) ....3903 -OSO

Receiver Housing 38-2103 Four Prong Socket 27-6044 Five Prong Socket 27-6035 Six Prong Socket 27-6036 Seven Prong Socket 27-6037 "rn'ne Control Shaft 28-8852 Volume Control Shaft 28-8853 Tuning & Volume Knob 27-4689 Scale Assembly 42-5781 - Fuse Fuse Insulator

7227 27-7729 O Inductive Suppressor 32-2250

55 `' LEAD v. 75 TUBE Interference Condenser 30-4307 2ND: DET. Distributor Condenser 30-1087 VIBRATOR 4S

IsT.AUDIO

OUTPUT

250 Pl.`}

IF=260KC FIGURE 1

0 0 31 0 TPUT

FIGURE 2

ANTENNJl1 COMPENSATOR

VOLJME CONTROL

lODJ

TUNING CONTROL

ANTENNA 78 TUBE LEAD I.E.



36 PHILCO TAJDEL S1516(Studebaker)

PHILCO RADIO & TELEV. CORP. Socket,`IYimners,Controls Alignment,Parts

I. F. TRANSFORMERS AND PADDERS The I. F. transformers are assel.a led cmmp'ete with pad -

ling condensers.

Both the primary and the secondary padders are placed side by side in the top of the transformer shied can. l'he adjusting screws are accessible thru the hales in the top of the shied. (See Figure 8).

The coil windings terminate in leads instead of teralinn .:

or lugs. The color scheme of the lends is given in Figure 7.

RAM

M 24:

FIGURE 7

If replacements are ever necessary, replace the entire coil assembly, 82-2026 for the first I. F. stage and 82-2027 for the second 1. F. stage. Neither the coil nor the padders will be furnished separately. Order only by the above numbers.

MODEL S-1516 ADJUSTMENTS All padding adjustments are carefully made at the factory

and ordinarily no readjustments are necessary. However, when readjustments are required, the procedure given below must be followed in detail.

Equipment Fully charged heavy duty storage battery or 6 -volt power

pack, 048A or 099 Philco Set Tester, 3164 Padding wrench, 27-7159 Padding screw driver.

General OUTPUT METER - The output meter must be connected

by means of an adapter to the pinte of the type 41 output tribe and to the Receiver chassis.

SIGNAI, GENERATOR - With the Receiver and signal generator set up for operation at the prescribed frequency, turn the Receiver volume control on full and set the signal generator attenuator so that a half scale reading is obtained on the output meter. The signal idí the speaker shoo id be audible but nut loud.

The shielding on the signal generator output lead must be connected to the Receiver housing.

Procedure I. F. - Set the signal generator at exactly 260 K. C. Connect the generator lend to the grid cap of the 6A7

tube in series with' n .1 mfd, condenser (without removing the grid clip). Adjust the padders ®, ®, .r. and ® on the first and second I. F. transformer fur ua ximuua reading on the output meter. (See Figure 8 for location of padders).

HIGH FREQUENCY AND R. F. - After padding the I .F. stages remove the generator.lend from the 6A7 tube.

Set the signal generator at 1550 K. C. and then connect the generator lead to the grid cap of the 78 R. F. tube in series with n .1 tuft'. condenser (without removing the grid clip).

Turn the tuning condenser plates out of niesh as far as they will go.

With the tuning condenser in this position, adjust the high frequency padder ® and the R. F. padder ád until the maxi -

919 -0E0

`--U

A-3723 'A' tun CCAMETJ

mum reading is obtained on the output meter. This is the true setting for 155(1 K. C., 155 on the dial scale.

LOW FREQUENCY - Turn the tuning condenser plates In mesh to approximately 580 K. C., 58 on the dial scale and set the signal generator at 580 K. C. Roll the tuning condenser and adjust the low frequency padder screw ®,for maximum reading on the output meter.

HIGH FREQUENCY READJUSTMENT - Turn the tuning condenser plates out of mesh to 1550 K. C. and set the signal generator at 1550 K. C. Then adjust the high frequency padder ® again for maximum reading on the output meter.

V10MTOR ir'.I.FTRANs. TSTUBE 41TaaE rAl F TRANS. IsTUBE KT rLF. P.!40.

© ̀ - ©©% rr

J snout TBTUBE 611 TUBE Nf PAODER RECTIFIER RF SET SEC

FuouE 8

Remove the generator lead from the 78 R. F. tube.

ANTENNA -- WHEN PADDING THE ANTENNA STAGE IT IS EXTREMELY IMPORTANT THAT THE PROPER DUMMY ANTENNA BE CONSTRUCTED AND USED.

Connect the signal generator lead to the antenna connector on the Receiver using an antenna lend, Part No. L-2665, and u 25 unnfd. condenser in series between the two leads.

Turn Ume tuning condenser in mesh to 600 K. C. and adjust the signal generator 6181 K. C. Adjust the antenna compensating condenser © fur maximum rending.

Turn the tuning condenser tó 14(0 K. C. and set the generator at 14101 K. C. Adjust the padders ® and ® for the maximum reading un the output meter.

When the antenna stage adjustment is made with the Receiver installed in the car, the Receiver antenna lead must be connected tu the car antenna in the usual manner. Connect the signal generator output lend to n wire placed near the car antenna but not connected to it.

When installing the Radio io a car, follow the installation instructions carefully. 'l'une in a weak broadcast signal at approximately 60 on the control scale. With a anull screw driver adjust the antenna compensating con tenser © for the maxi signal.

(1t 0

TUNING Nis

VOLASE METRO_

ANTENNAMPENSATCR

MAY 1, 1938

27+6199

IUD 27 -CC 039-090 assn 9 28.8099 27.7133

38-9234 AMMETER LEAD COMPLETE

m © ] R F RAMER

A PADDER

29-14 Mans

30 .24o 41M 211-IE72 CAME 294009 2T -T133

39ó221 'A' LEAD COMPLETE

sºse. ....

.. 2. . ! . . . ? ? g ?

e 8 88 k $ $g

3

c ä

mF é.d. isx'äSamB E

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888888 fiflxfixB

Mee üie Ñ i S:33;14



PHIICO PAGE 9-3'7

ANT.


CONDENSER

PHILCO RADIO

PACKARD - PHILCO MODEL P

T 78

NOTE-THIS SIDE OF A`BATTERY GROUNDED TO CUE FRAME OF CAR

FIOiJRE I

DET.OSC. 6A7

VIBRATOR PT. NO.41-317O4

7

& TELEX'.

- 1517 SINGLE

CORP. MODEL P1517 ( Pao kar d So helm tic ,Parts Chassis Layout

UNIT RECEIVER

I.F. 2WDET.I9TAUDIO so 's OUTPUT 78 75 1SOrrF 41

32 000.0. 20 000.0. .60 Oft

RECTIFIER

MAIL A VIBRATOR FT. NO. 413170-3

PARTS LIST - MODEL P-1517 O. Description Part No.flo. Description Part No. 841118E QQ Antenna Choke 32-2344 ® Condenser (4,000 mmfd.) ..30-4185 RECTIFIER, C) Condenser (.05 mid.) 30-4444

4

Condenser (.02. mfd.) 30-4419 Antenna Transformer 32-2516 Tone Control Switch 42-1383 ®Antenna Compensating Output Transformer 32-7495 Condenser 31-6082 Cone & Voice Coil 36-3586 © Tuning Condenser 31-1930 Field Coil Assembly 36-3597

e First Padder (on Tun. Cond.) On & Off Switch 42-1368 s Resistor (70.000 ohms) ..33-370344 Pilot Lamp 34-2039

C) Condenser ei Condenser (250 mmfd.) 30-1032 (.1-.25-.25-.5 mid.) 30-4415 ® Condenser (.5 mfd.) 30-4015 iResistor (450 ohms) 33-1218 A" Choke 32-253;1 R. F. Transformer 32-2307 ® Condenser (250 mmfd.) ..30-1032 Second Padder (on Tim. Cond.) ® Filament Choke 32-1604 Resistor (70,000 ohms) ..33-370344 g Vibrator Choke 32-2039 Condenser (765 mmfd.) 30-1069 Condenser (.5 mfd.) 30-4015 Condenser (.05 mfd.) .3815 -OSO Condenser (.05 mfd.) 30-4444 Resistor(1,000,000 ohms) 33-510344 ® Resistor (20 ohms) 33-020344 ® Third Padder (on Tun. Gond.) e3 Power Transformer 32-7550 ® Oscillator Transformer 32-2308 e) Condenser (7.500 mmfd.) ..30-4420 ® Condenser (250 mmfd.) 30-1032 © "B" Filter Choke 32-7545

iResistor (99,000 ohms) ..33-399344 m Filter Condenser (4-8 mfd.) 30-2150 Low Frequency Padder 31-6102 ® Condenser (250 mmfd.) ..30-1032 Resistor (45,000 ohms) 33-345344 ® "B" Choke 32-1281 Padder (Pri. 1st. I. F. Trias.) ..41-3170-2 First I. F. Transformer ...32-2026 ® Vibrator (OPTIONAL) ..41-3170-3 Padder (Sec. 1st I. F. Trans.) Receiver Housing 38-9150 Padder (Pri. 2nd I. F. Trans.) Pilot Lamp Assembly 38-8467

i®' Second I. F. Transformer ..32-2027 Tuning Shaft 28-8783 ä3 Padder (Sec. 2nd I. F. Trans.) Volume Shaft 28-8784

Condenser (250 mmfd.) .30-1032 Scale Assembly 42-5776 ® Resistor (25,000 ohms) ..33-325344 Gland Nut 28-6773 I® Condenser (110 mmfd.) ....30-1031 Four Prong Socket 27-6044 e Volume Control Five Prong Socket 27-6035

(350,000 ohms) 33-5139 Six Prong Socket 27-6036 ® Condenser (.01 mid.) ...3903-OSU Seven Prong Socket 27-6037 O Resistor (32,000 ohms) ..33-332434 Interference Condenser 3 Resistor (20,000 ohms) :.33-320344 (Dome Light) 30-4007 133 Condenser (.01 mfd.) ..3903 -OSO Interference Condenser

Resistor (600 ohms) 33-1212 (Generator) .30-4475 Resistor(1,000,000 ohms) 33-510344 Distributor Resistor 4851 Resistor (250,000 ohms) 33-424344 Fuse 7227 Condenser (250 mmfd.) 30-1032 Fuse Insulator 27-7729 (a Condenser (.01 mfd.) .3903-0SU Tee Bolt (Rec. Mtg.) 28-6268

n Resistor (500,000 ohms) 33-449344 Nut (Rec. Mtg.) W -518A ® Resistor (250,000 ohms) 33-424344

O

VIBRATOR

75 TUBE v 0. DET. Iv: AUDI O

P 7

TONE CONTROL

LE =260KC

OCTOBER 15, 1937

I ' ® 32 U PUT ® FsauRE 2

IS ANTENNA COMPENSATOR

VOLUME CONTROL

'TUNING' CONTROL

ANTENNA 78 TUBE LEAD I.F.



38 PHIL CO

MODEL P1517(Paokard) MODEL P1530 " Socket,Trimmers Alignment

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PHILCO PAGE 9-39

AN T

4 8

CONNECT THE ANTENNA ICAO TO NOS TERMINAL rOR USE WITH

TNC UNDER CAR ANTENNA

At

HpiC.OTHIS SIDE 0rA RATTERT ROUNDED TO CASE

(FRAME Or CAR)

,tir 78

PHILCO RADIO &

NASH - PHILCO MODEL - N-1524

S

9

DIAGRAM Or CONNECTIONS TO ANTENNA CO THE GREEN IS THE ANTENNA LEAD. THC BROWN IS THE GROUND LEAD

DETF: OSC. 16A7

OCTOBER 1 9 3 7

s. Description

MODEL N- 1524 PARTS LIST Part No.

r Antenna Choke 32-1926 s Condenser (25 mmfd.) 30-1067

Condenser (50 mmfd.) 30-1029 Antenna Transformer 32-2895 Tuning Condenser 31-2161 First Padder (on Tun. Cond.) Condenser (.05 mfd.) 30-4444 Condenser (.03-.1-.25-.5-.5-.5 mfd.) .30-4554

Os Resistor (550 ohms) 33-1280 o R. F. Transformer 32-2830 íQ Second Padder (on Tun. Cond.)

Resistor (70,000 ohms) .33-370344 O Condenser (6,000 mmfd.) .30-4467 ® Third Padder (on Tun. Cond.) ® Oscillator Transformer 32-2828 ® Resistor (99.000 ohms) ..33-399344 © Low Frequency Padder 31-6230 ® Resistor(1,000,000 ohms) 33-510344 ® Padder (Prl. 1st I. F. Trans.) ® First I. F. Transformer 32-2791 ® Padder (Sec. 1st I. F. Trans )

® Padder (Pri. 2nd I. F. Trans )

® Second I. F. Transformer 32-2793 e Padder (Sec. 2nd I. F. Trans )

Is Condenser (250 mmfd.) 30-1032 clip Resistor (25,000 ohms) ..33-325344 ® Volume Control

(1,000,000 ohms) 33-5245 Condenser (.01 mfd.) 30-4479 Condenser (110 mmfd.) 30-1031

® Resistor (330,000 ohms) 33-433344 ® Resistor (600 ohms) 33-1212 ® Resistor (70,000 ohms) ..33-370444 O Resistor (6,000 ohms) ..33-260344

eResistor (70,000 ohms) .33-370344 Resistor

(240,000 ohms) 33-424344 (240,000 ohms) 33-424344

O O O O o o

I. F. 78

I son

TELEV. CORP.

TWO UNIT RECEIVER

41 TUBE OUST


® Resistor (490,000 ohms) 33-449344 Q Condenser (.01 mfd.) 30-4169 O Condenser (250 mmfd.) 30-1032 ® Resistor (490,000 ohms) 33-449344 Q Resistor (3,500 ohms) ...33-235344 8 Condenser (.05 mfd.) 30-4454

883 Condenser (.01 mfd.) 30-4501 iíß Condenser (2,000 mmfd.) 30-4177 ® Output Transformer 32-7928 Q Choke 32-1374 4'J Condenser (250 mmfd.) 30-1032 ® Resistor (1,500 ohms) ..33-215344

Condenser (.15 mfd.) 30-4191 Tone Control Switch 42-1389

(gi Cone & Voice Coil 36-3586 % Field Coil 32-9236 c. On & Off Switch 42-5617 ® Pilot Lamp ß4-3040 ® Condenser (250 mmfd.) 30-1032 O. Condenser 1.5 mfd.) 30-4474 ® "A" Choke 32-1374 ® Filament Choke ... 32-2729 ® Condenser (250 mmfd.) 30-1032 ® Vibrator Choke 32-2812 ® Condenser (.5 mfd.) 30-4474 ® Vibrator 41-3170-3

Resistor (200 ohms) 33-120344 ® Power Transformer 32-7911 ® Condenser (7,500 mmfd.) 30-4420 ® Filter Choke ® Filter Condenser (4-8 mfd.) ® Condenser (250 mmfd.) ... ® Choke ® Condenser (250 mmfd.) ...

Receiver Housing Speaker Cable 41-3378 Tuning & Volume Knob ....27-4690

28-8813 Tone Knob 27-4639 28-8814 Knob Base 28-4184 28-8798

2No.DET. ISTAUDIO

75

MODEL N1524(Nash) Schematic ,Parts Chassis Layout

OUTPUT

41

I.F=260KC

'18 TUBE I.F.

Tuning Control Shaft Volume Control Shaft Tone Control Shaft .. ,

32-7910 30-2258 30-1032 32-2657 y(B 30-1032 Description Part No. 38-2102 Scale Assembly 42-5786

R

2N4 DET. InAUD10

18TUBE EA') TUBE R.F DET.OSC.,

p3 S01

tP.-q----+

oa

RECTIFIER ® 15 ® Description Part No.

Pilot Lamp Assembly 38-7734 Distributor Resistor 33-1196 Interference Condenser 30-4007 Interference Condenser 30-4562



40 PHILCO

PIIIILCO RADIO & TELEX'. CORP.



PHILCO PAGE 9-41

A

2

CONNECT THE ANTENNA LEAD TO NO.2 TCRUINAL roe USE WITH

THE UNDER CAR ANTENNA

PHILCO RADIO & TELEV. CORPSohe 51526(Studeba

Schemata Chassis Layout

STUDEBAKER-PHILCO MODEL-S-1526 TWO UNIT RECEIVER

Dff: OSC. /6A7

1,000,00CR

DIAGRAS. OF CONNECTIONS O ANTENNA COIL THE GREEN IS THE ANTENNA LEAD. THE DROWN IS THE GROUND LEAD

MODEL S-1526 PARTS LIST

Description Part Rollo. Antenna Choke 32-2063 Condenser (25 mmfd.) 30-1067 Condenser (50 mmfd.) 30-1029 Antenna Transformer 32-2855 Toning Condenser 31-2161 First Padder (on Tun. Cond.) O Condenser (.05 mfd.) 30-4444 3 Condenser

(.03-.1-.25-.5-.5-.5 mfd.) 30-4554 Resistor (550 ohms) 33-1280 R. F. Transformer 32-2810 e Second Padder (on Tun. Cond.) 0 Resistor (70,000 ohms) .33-370344 0 Condenser (6,000 mmfd.) 30-4467 10 Third Padder (on Tun. Cond )

Oscillator Transformer 32-2828 Resistor (99,000 ohms) ..33-399344 Low Frequency Padder 31-6230 Resistor(1,000,000 ohms) 33-510344 01 Padder (Pri. 1st I. F. Trans.) 01) First I. F. Transformer 32-2791 Padder (Sec. 1st I. F. Trans ) Padder (Prt. 2nd I. F. Trans ) Second I. F. Transformer 32-2793 Padder (Sec. 2nd I. F. Trans.) Condenser (250 mmfd.) 30-1032 Resistor (25,000 ohms) ..33-325344 Volume Control (1,000,000 ohms) 33-5251

Condenser (.01 mfd.) 30-4479 Condenser (110 mmfd.) 30-1031 Resistor (330,000 ohms) 33-433344 Resistor (600 ohms) 33-1212 Resistor (70,000 ohms) ..33-370444 Resistor (6,000 ohms) ..33-260344 Resistor (70.000 ohms) .33-370344 Resistor (240.000 ohms) 33-424344 Resistor (240,000 ohms) 33-424344 Resistor (490,000 ohms) 33-449344 Condenser (.01 mfd.) 30-4514

I. F. 78

.000 000

6.00011.

10, 000.0.

2No.DET. IsT.AUDIO

75

ft

RECTIFIER sou

1F:=260 KC

OUTPUT 41 (aal

p5 0. 20 p

r or

NOVEMBER 1937

No. Description Part No. No. Description Part No. Fuse Insulator 27-7729 Scale Assembly 42-5779 Tuning Control Shaft 28-8790 Speaker Cable 41-3231 Volume Control Shaft 28-8791 Tuning & Volume Knob ....27-4689 Tone Control Shaft 28-8792 Tone & "On -OR" Knob ...27-4618

Description Part No. Condenser (250 mmfd.) .30-1032 41 TUBE Resistor (490,000 ohms) 33-449344

OUTPUT Resistor (3,500 ohms) ...33-235344 Condenser (.05 mfd.) 30-4454 Condenser (.01 mfd.) 30-4501 Condenser (2,000 mmfd.) 30-4177 Output Transformer 32-7928 Choke 32-1374 Condenser (250 mmfd.) .. 30-1032 Resistor (1,500 ohms) ..33-215344 Condenser (.15 mfd.) 30-4101 Tone Control Switch 42-1389 Cone & Voice Coil 36-3526 Field Coil 32-9236 On & Off Switch 42-1369 Pilot Lamp 34-2039 Condenser (250 mmfd.) 30-1032 Condenser (.5 mfd.) 30-4474 "A" Choke 32-1374 Filament Choke 32-2729 Condenser (250 mmfd.) 30-1032 Vibrator Choke 32-2812 Condenser (.5 mfd.) 30-4474 Vibrator 41-3170-3 Resistor (200 ohms) 33-120344 Power Transformer 32-7911 Condenser (7,500 mmfd.) 30-4420 Filter Choke 32-7910 Filter Condenser (4-8 mfd.) 30-2258 Condenser (250 mmfd.) 30-1032 Choke 32-2657 Condenser (250 mmfd.) 30-1032 Receiver Housing 38-2058 Four Prong Socket 27-6044 Five Prong Socket 27-6035 Six Prong Socket 27-6036 VI Seven Prong Socket 27-6037 Inductive Suppressor 32-2250 Interference Condenser 30-4007 Fuse 7227

0, Q 78TUBE ® 9U m ei) 0 Ge r

LTUBE OUTPUT

57U 2"D DET. ISTAUDID RECTIFIERU ®



42 PHILCO MODEL S1526(Studebaker) PHILCO RADIO & TELEV. CORP. Sooket,TrinnneaBs,Controls Alignmant,Parts

MOURNE CONTROL FLEXIBLE

FT Yl-BFBI

265339

w 1506 28-725

42-5779

2845727

284180

W 1508

28-7250

ON-OFF SWITCH SHAFT

VOLUME CONTROL SHAFT

TUNING CONTROL FLEXIBLE SHAFT

2-790

TONE CONTROL FLEXIBLE

SHAFT 28-6792

58-6407

42 5764

268

42-0771

28-4151

W417

423752 2-1407

4-7079 423755

C8º -74n

ºB-7175

42-5764

28-5150

'e?mmimmism _Ìw 1504

28-7250 ,- 28-7248

TONE

UUGNNOSNppiil

CONTROL

mmr c = e.

HV.2

4

27-7742

e

282 7155

- 118Mor

27-4489

28-6790 TUNING GON160L FLEXIBLE4IMFT 26-6791 VOLUME CON160L FLEXIBLE SHAFT

ÌiliIlli>aiE l ,,26-6,92

TONE CONTROL FLEXIBLE SHAFT

diei

5

u

o a

FEBRUARY 1098

7 27-4618 283684

o 27-9024

V; All

59-8ffiI A LEAD COMPLETE

1866

27-7133 1.9 213-1270 27-71501

78-6171 A LEAD COMPLETE

1 a I(

ti o ç a z C

3 é

72 60

ºX75 1455

29.7472

s o

Ó

1782

W T 43

º9-8496 V B75º 2 224407 r,

423755 m

N ffi

á

VI LM

U i

J N F C

. '4a..n 1 s

_Sh8wro8^ar,9e:9Sem_fflo

8888888 a 8 s ñ ä 2222222

g.

t $äa "8 SBe 33ämlm3m"ym3immGF.LIñ.2

, Fm gmro s _:L

_wágáá=:=rowro...ro

'John F. Rider, Publisher


PHILCO PAGE 9-4j3.

D

r<

PHILCO RADIO & TELEV. CORP. MDDEL G1528(Graham) Schematic ,Parts Chassis Layout

GRAHAM .. PHILCO MODEL - G-1528 TWO UNIT RECEIVER

I.F:=26OKC

4

(: H

1.1-'N irre 1 l QQaQQj-114

ECEMBER 1937

3 rn

MODEL G- 152

Description Part No.

Antenna Choke 32-2063 Condenser (25 mfd.) 30-1067 Condenser (50 mmfd.) 30-1029 Antenna 'Transformer 32-2936 Tuning Condenser 31-2161 First )'adder (on Tun. Cond.) Condenser (.05 mfd.) 30-4444 Condenser

(.03-.1-.25-.5-.5-.5 mfd.) 30-4554 Resistor (550 ohms) ....33-155331 R. F. Transformer 32-2830 Second )'adder (on Tun. Cond.) Resistor (70,000 ohms) ..33-370344 Condenser (6,0011 mmfd.) .30-4467 Third )'adder (on 'L'un. Cond )

Oscillator Transformer 32-2828 Resistor (99,000 ohms) ..33-399344 Low Frequency )'adder 31-8230 Resistor( I ,000.000 ohms) 33-510344 )'adder (I'ri. lei I. F. Trans.) First 1. I, . Transformer 32-2791 ladder (See. 1st 1. F. 'Trans.) )'adder (Poi. 2nd I. F. Trans.) Second I. F. Transformer 32-2793 )'odder (See. 2nd 1. F. Trans.) Condenser (25(1 mntfd.) 30-1032 Resistor (25,000 ohms) ..33-325344 Volume Control (1,000,000 ohms) 33-5245

Condenser (.01 mfd.) 30-4479 Condenser (110 mmfd.) 30-1031 Resistor (330,000 ohms) 33-433344 Resistor (600 ohms) ..33-160331 Resistor (70,000 ohms) ..33-370444 Resistor (6.000 ohms) ...33-260344 Resistor (70.000 ohms) .33-370344 Resistor (240,000 ohms) 33-424344 Resistor (240,000 ohms) 33-424344 Resistor (490.000 ohms) 33-449344 Condenser (.01 mfd.) 30-4514


Fuse Insulator 27-7729 Tuning Control Shaft 28-8813 Volume Control Shaft 28-8864 Tone Control Shaft 28-8798 Scale Assembly 42-5829

ta

8 PARTS LIST


89 Condenser (250 mmfd.) ....30-1032 w Resistor (490,000 ohr8s) .33-449344 © Resistor (3,500 ohms) ...33-235344 © Condenser 1.05 mfd.) 30-4454 Ji Condenser (.01 mfdJ >t0-4501

Condenser (4000 mmfd.) a0-4185. 89 Output Transformer 32-7928 ® Choke 32-1374 Q Condenser (250 mmfd.) 30-1032 49 Resistor (1,500 ohms) ...33-215344 e Condenser (.15 mfd.) 30-4191 e Tone Control Switch 42-1389 Q Cone and Voice Coil 43-2608 ON Field Coil 32-9263 ® On and Off Switch 42-5617-:3 ® Pilot Lamp 34-2039 g Condenser (250 mmfd.I 30-1032 ä9 Condenser (.5 mfd.) 30-4474

"A" Choke 32-1374 Filament Choke 32-2_729

e Condenser (250 mmfd.) 3(1-1032 tek Vibrator Choke :32-2812 e Condenser (.5 mfd.) 10-4474 ® Vibrator 41-3170-3 ® Resistor (200 ohms) 33-120344 ® Power Transformer 32-7911 ® Condenser (7,500 mmfd.) :30-4420 e Filter Choke 32-7910 49 Filter Condenser (4-8 mfd.) 30-2258 4 Condenser (250 mmfd.) 30-1032 4. Choke 32-2657 e Condenser (250 mmfd.) 30-1032

Receiver Housing 3S-2179 Four Prong Socket 27-6044 Five Prong Socket 27-6035 Six Prong Socket 27-6030 Seven Prong Socket 27-6037 Inductive Suppressor 32-2250 Interference Condenser 30-4007 Fuse 722,


Speaker Cable 36-4034 Speaker Mtg. Plate 38-9463 Tuning & Volume Knob 27-4705 Tone Knob 28-7212 Knob Base 28-4184

©John F. Rider,. Publisher

44 PHILCO MODEL G1528(Graham) SOolflat,Trimmers YHILCO RADIO & TELEV. CORP. Alignment ,Controls ,Parts

ºº 1lt 4-1f11



PHILCO PAGE 9-45

ANT

%78

NOTE

F.

THIS SIDE OFABATTERT GROUNDED TO CASE

FRAME OF CAR VIMIUMIMMIE!(

MODEL C1423(Chrysler) PHILCO RADIO & 'l'EI,EV. CORP. Scheme.l:ic,Socket,Trimmers

Layout,Alignment,Parts

4 u _ sx# USE EITHER VIBRATOR

OPTION A

A

I. F. 78

gro DET. xsa..t©OUT PUT I"AUDIO.

75 41

IJ

B

A

ns VIBRATOR PT.N..41-3170.2 VIBRATOR PT. NI, 41-3170.3

U

ö, -

osE 3

v `.c P

00 00 ÚU Ú0 ÚU -13 ,- NJ 4-

s _

Cl Ú Cl Ú Ú ][ Y

3 S 9 e

U

d

1.F.= 260 KC.

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ón.pó: sne ñ

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46 PHILCO

i

MODEL P1530 (Packard )' Schematic ,Parts PIIII,CO RADIO & TELEV. CORP. Chassis Layout

NOTE

ANT

PACKARD - PHILCO MODEL CONNECT THE ANTENNA TO NQI TERMINAL FOR USE WITH COWL ANTENNA

CONNECT THE ANTENNA TO NO2 TERMINAL /OR VOL WITH ROOF OR UNDER CAR ANTENNA

R. E

; 7

b

A'p-6`y

NOTE''. OS SIDE OF BATTERY" GROUNE NDEOETCAD OR CASE

FRA

DIAGRAM OF CONNECTIONS TO NTENNA COIL

THE GREEN IS THE ANTENNA LEAD THE DROWN IS THE GROUND LEAD.

PARTS LIST - No. Description Part No.

QQ Antenna Choke 32-2063 Condenser (25 mmfd.) 30-1067 Cöndenser (50 mmfd.) 30-1029 Antenna Transformer 32-2833 Tuning Condenser 31-2111 First Padder (on Tun. Cond )

Condenser (.05 mfd.) 30-4444 Condenser (.1-.1-.25-.5-.5 mfd.) 30-4547

Resistor (600 ohms) 33-1212 Sensitivity Switch 42-1378 Sensitivity Control 33-5248 It. F. Transformer 32-2830

(70,000 ohms) _.33-370344 Condenser (6,000 mmfd. le. 30-4445 Second Padder (on Tun. Cond.)

I Third Padder (on Tun. Cond )

Oscillator Transformer 32-2828 Resistor (99,000 ohms) ..33-399344

D Low Frequency Padder 31-6230 Resistor(1,000,000 ohms) 33-510344

® Padder (Pri. 1st I. F. Trans.) ® First I. F. Transformer 32-2791 ® Padder (Sec. 1st I. F. Trans )

® Padder (Pri. 2nd I. F. Trans )

Q Second I. F. Transformer 32-2793 e Padder (Sec. 2nd I. F. Trans )

Condenser (250 mmfd.) 30-1032 Resistor (25,000 ohms) ..33-325144 Condenser (.01 mfd.) 30-4479

® Volume Control (1,000,000 ohms) 33-5245

A Condenser (110 mmfd.) 30-1031 Resistor (330,000 ohms) 33-433344

® Resistor (600 ohms) 33-1212 Aj Resistor (70,000 ohms) ..33-370344 3 Resistor (6,000 ohms) ...33-260344

A Resistor (70,000 ohms) ..33-370344 Resistor (240,000 ohms) 33-424344

® Resistor (240,000 ohms) 33-424344 ® Resistor (490.000 ohms) 33-449344 ® Condenser (.01 nifd.) 30-4514

E) O © O O o O

O D 01

DU. 09C. 6 7

MODEL P-1530 ,No. Description Q Condenser (250 mmfd.) .

® Resistor (490,000 ohms) ® Resistor (6,000 ohms)

Condenser (.05 mfd.) +s Condenser (4,000 mmfd.) ® Condenser (.05 mfd.) Q Resistor (15,000 ohms)

Tone Control Switch NJ Output Transformer ® Choke 32-1374 Q Condenser (250 mmfd.) 30-1032 O Cone & Voice Coil 36-3159

Complete Speaker (A50) 36-1371 ® Field Coil Assembly 36-3513 ® Resistor (1,500 ohms) ..33-215344 ® Condenser (.1 mfd.) 30-4499

"B" Choke 32-2812 © Condenser (250 mmfd.) 30-1032 ® On & Off Switch 42-1368 e Pilot Lamp 34-2039 A Condenser (250 mmfd.) 30-1032 s3i Condenser (.5 mfd.) 30-4474 ® "A" Choke 32-1644 ® Filament Choke 32-2729 ® Condenser (250 mmfd.) 30-1032 A Vibrator Choke 32-2312 ® Condenser (.5 mfd.) 30-4474 © Vibrator 41-3170-3 ® Resistor (200 ohms) 33-120344 ee Power Transformer 32-7911 ® Condenser (7,500 mmfd.) 30-4420 n "RI' Filter Choke 32-7910 G3 Filter Condenser (4-4 mfd.) 30-2257 C3 Condenser (250 mmfd.) .--.30-1032

Receiver Housing 38-2056 Pilot Lamp Assembly 38-8467 Tuning Shaft 28-8779 Volume Shaft 28-8780 Tone Shaft 28-8781 Local Distance Shaft 28-8782 Accessory Speaker Socket 38-8803 Speaker Socket 27-6030

P-1530 TWO UNIT RECEIVER

IF 78

70,000 n

FIGURE 3

2,4. GET. YT Ai.3IO tso Pf

000000 01}12

330,000 n_

ANTENNA 4ITUBE

Part No, CONNECTOR OUTPUT,

30-1032 33-449344

.33-260344 30-4454

--.30-4185 30-4495

.33-315344

...42-1377 32-7909

63 61 25 62 65 33 69

UBE 64

Q47 ACCESSORY SPE

o3pt,if LAU/woo OUTPUT

11,000A

4)

®

:DOt'rf

LF'=260 KC

FOR ALIGNIENT SEE INDEX

ErA7TUBE 78TUB D T.OSC. R.F.

wV A R

«D!\ e 18

VIBRATOR EAD OUTPUT 69 41 28 iST.AUDIO 70 RECTIFIER45

Description Part No. Four Prong Socket 27-6044 Five Prong Socket 27-6035 Six Prong Socket 27-6036 Seven Prong Socket 27-6037 Interference Condenser 30-4007 Interference Condenser 30-4475 Distributor Resistor 4851

FIGURE 4

46

No. Description Part No. Fuse 7227 Fuse Insulator 27-7727 Stud (Speaker Mtg.) 28-6088 Nut (Speaker Mtg.) W-554 Tee Bolt (Rec. Mtg.) 28-6268 Nut (Rec. Mtg.) W -518A Switch & Lead Assembly 41-3217



PHILCO PAGE 9-47

PHILCO RADIO & TELEV. CORP. MJDEL P1535(Paclrd) Schematic;Parts Chassis Layout

PACKARD - PHILCO MODEL P-1535, TWO UNIT RECEIVER

CONNECT ANTENNA TO NO.I TERMINAL IOR USE WITH COWL ANTENNA.

COPNECT ANTENNA TO NO2 TERMINAL FOR USE WITH ROOF OR UNDER -CARRIAGE ANTENNA

ANT.

Udo NOTE .

O THIS SIDE OrA BAT TERY

GROUNDED TO CASE FRAME OF CAR

DIAGRAM OF CONNECTIONS OF ANTENNA COIL

TIC GULCH D THE ANrdNA LEAD. THE BROWN IS THE GROUND LEAD.

Don 20.00on

S

FIGURE 1

PARTS LIST - MODEL P-1535 No. Description

IQ Antenna Choke ® Condenser (25 mmfd.) ® Condenser (50 mmfd.)

Antenna Transformer a Tuning Condenser

® First Padder (on Tun. Cond.) ® Condenser (.05 mfd.) 30-4444 ® Condenser

(.05-.12-.15-.25-.5-10 mfd.) 30-4545 ® Resistor (700 ohms) 33-1220 Qa Sensitivity Control

(1,250 ohms) 33-5248 C) Sensitivity Control Switch 42-137.8 # Resistor (70,000 ohms) ..33-370344 laj Condenser (6,000 mmfd.) 30-4467

Ci R. F. Transformer 32-2830 CI Second Padder (on Tun. Cond.) (iA Third Padder (on Tun. Cond )

I Oscillator Transformer 32-2829 s Condenser (250 mmfd.) 30-1032

® Resistor (99,000 ohms) ..33-399344 Low Frequency Padder 31-6230 so

® Resistor (45,000 ohms) ..33-345344 tel

© Resistor(1,000,000 ohms) 33-510344 ® First I. F. Transformer 32-2554 A A Second I. F. Transformer 32-2556 n # Condenser (250 med.)e, 30-1032 ® Resistor (25,000 ohms) ..33-325344 e(dj

j Condenser (.01 mfd.) 30-4479 er

Volume Control (350,000 ohms) 33-5246

g Condenser (110 mmfd.) 30-1031 eü Resistor (190,000 ohms) 33-419344 (gai Resistor (600 ohms). 33-1212 e Resistor (20.000 ohms) ..33-320344

Resistor (40,000 ohms) ..33-340444 # Resistor (51,000 ohms) ..33-351344 # Resistor (1,000 ohms) ..33-210344 SI Resistor (490,000 ohms) 33-449344 e Condenser (.01 mfd.) 30-4501 e Condenser (250 mmfd.t 30-1032

Resistor (600,000 ohms) 33-459334

2' DEI. Ir' AUDIO

o.0 eon

C® 61 r) RECTIFIER

84

Q ACCESSORY SPEAKER

OUTPUT

4i

'KT

I.F=260 KC

OCTOBER, 1937

Part No. No. Description Part No. 32-2063 G Input Transformer 32-7770 ANTENNA 6Y7GTUBE 7BTUBE O 65 30-1067 © Condenser (4,000 mmfd.l 30-4t85 CONNECTOR OUTPUT I.F.

30-1029 ® Condenser (.03 mfd.) 30-4447 .

32-2833 Q Resistor (15,000 ohms) ..33-315344 31-2111 ® Tone Control Switch 42-1377

C) Condenser (250 mmfd.) 30-1032 65 Condenser (.5 mfd.) 30-4474 n "A" Choke 32-1374 ® Filament Choke 32-1604 s© Condenser (250 mmfd.) 30-1032 A Vibrator Choke 32-2537 C5 Condenser (.5 mfd.) 39-4474 se Vibrator 41-3170-3

Resistor (200 ohms) ....33-120344 Power Transformer 32-7720 Condenser (7,500 mmfd.) 30-4420 Filter Condenser (4-8 mfd .1 30-2167 Filter Choke 12-7811 "B" Choke 32-1281 Resistor (1,500 ohms) ...55-21.5341 Choke 32-2657 Condenser (250 mmfd.) 30-1032 Receiver Housing 38-2050 Tuning Shaft 28-8762 Volume Shaft 28-8763 Tone Shaft ... 28-8764 Local Distance Shaft 28-8765 Tuning and Volume Knob 27-4687

rr

GU TUBE VIBRATOR L)A LEAD DRIVER

78RTFBE (FR

29 25 27 32 (B®

60 75TUBE

62 I41 Ce I7 (3i CD

2pDET 'B4TUBE1'6A7TUBE' 55 IJIsT.AUDIO RECTIFIER DET-OSC.45

(ID

Switch Knobs Accessory Speaker Socket Speaker Socket

28-7255 ...38-8805

27-6030 FIGURE 2

Four Prong Socket. Five Prong Socket Six Prong Socket Seven Prong Socket

..27-0044 27-6035 27-6036 27-6037

Description Right Prong Socket Interference Condenser Interference Condenser

Part No. 27-6058 30-4007 30-4475

Description 'fee Bolt (Rec. Mtg.) Nut (Rec. 511g.) Mtg. Bracket and Stud

Inductive Suppressor 32-9359 (Speaker Sltg.l Fuse 7227 Nut (Speaker 511g.) Fuse Insulator 27-7729 Switch & Lead Assembly

Part No. 28-6268

W-518

28-1546 W-55

41-3217

® Output Transformer 32-7778 Choke 32-1374

© Condenser (250 mmfd.) . 31)-1032 ® Cone & Voice Coil 36-3150

Complete Speaker (A49í 36-1370 +P Field Coil Assembly .. 36-3513 # On -Off Switch 42-1374

®John F. Rider, Publisher


48 PHILO( ) MODEL P1535(Pack r Socket,Trimmers Alignment

EDEL L1560(Lincoln) PHILCO RADIO & TELEV. CORP. Control Details,Parts

1. F. TRANSFORMERS AND PADDERS The 1. F. transformera are as hied complete with pad-

ding condensers.

Both the primary and the secondary padders are placed side by side in the top of the transformer shield can. The adjusting screws are accessible thru the holes in the top of the shield. (See Figure 4).

The coil windings terminate in leads instead of terminals or lugs. The color scheme of the leads is given in Figure 8.

KA

62 unD Emma 3

If replacements are ever necessary, replace the entire coil sssenlhly, 32-2554 fur the first I. F. stage and 32-2636 for the

econd I. F. stage. Neither the coil nor the padders will be

furnished separately. Order only by the above numbers.

212

MODEL P-1535 ADJUSTMENTS All padding adjustments are carefully made at the factory

and ordinarily no readjustments are necessary. However, when readjustments are required, the procedure given below must be followed in detail.

Equipment Fully charged heavy duty storage battery or 6 -volt power

pack, 048A or 099 l'hilco Set Tester, 3161 Padding wrench, 27-7159 Padding screw driver.

General

OUTPUT METER-The output meter must be connected by means of an adapter to the plate of the type 6Y7G output tube and to the Receiver chassis.

SIGNAL GENERATOR-With the Receiver and signal generator set up for operation at the prescribed frequency, turn the Receiver volume control on full and set the signal generator attenuator so that a half scale reading is obtained un the output meter. The signal in the speaker should be audible but not loud.

The shielding on the signal generator output lead must be

connected to the Receiver housing.

The sensitivity switch must be in the distant position.

Procedure I. F. -Set the signal generator at exactly 260 K. C.

Connect the generator lead to the grid cap of the 6.47 tube in series with a .1 mfd. condenser (without removing the grid cap). Adjust the primary and secondary screw padders un the first and second I. F. transformer for maximum reading on the output meter. (See Figure 4 for location of padders)

HIGH FREQUENCY AND R. F. - After padding the I. F. stages remove the generator lend from the 6A7 tube.

Set the signal generator ut 1500 K. C. and then connect the generator lead to the grid cap of the 78 R. F. tube in series with a .1 mfd. condenser (without removing the grid cap).

Place a piece of paper approximately .008" thick as a

gauge between the heel of the rotor plates and the stator plates on the oscillator section of the tuning condenser. Turn the rotor plates in mesh until they strike against the paper.

With the tuning condenser in this position, adjust the high frequency' padder ® and the R. F. padder ® until the maximum reading is obtained on the output meter. This is the true setting for 1500 K. C., 150 on the dial scale.

1.OW FREQUENCY - Turn the tuning condenser plates in mesh to approximately 580 K. C., 58 nn the dial scale and set the signal generator at 580 K. C. Roll the tuning condenser :md adjust the low frequency padder screw ® for maximum rending on the output meter.

Emma 4

1-11011 FREQUENCY READJUSTMENT - Turn the tuning condenser plates out of mesh to 15011 K.C. and set the sigmd generator at 1500 K. C. Then adjust the high frequency padder ® again for maximum reading on the output meter.

Remove the generator lead from the 78 R. F. tube.

.ANTENNA - WHEN PADDING THE ANTENNA STAGE IT IS EXTREMELY IMPORTANT THAT THE PROPEIt DUMMY ANTENNA BE USED.

Connect the signal generator lead to the antenna socket an the Receiver using a 250 mmfd. condenser in series with an antenna lead, Part No. 41-8191.

Turn the tuning condenser to 1400 K. C. and set the generator at 1400 K. C. Adjust the padder, ® and © for the maximum reading on the output circler.

When the antenna stage adjustment is made with the Receiver installed in the car, the Receiver antenna lead must he connected to the car antenna in the usual manner. Connect the signal generator output lead to a wire placed near the car antenna but not connected to it.

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SHAFT maim

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27-4821

LINCOLN CONTROL - MODEL L-1560

TYNaN6 Co11TROl KETTLE 31MFT

28-0821

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29-.i91

38-9461 w4n

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26 siso

W 1306

n -nao

n-7248 TONE 949-190 4108 28.1 72 21-7132 Y 009 1-r,3! 33Y_'16i 167133

CONTROL 3HAFT

COM1110Lt. 3sa16r-s LEA C.028131C.02813172OTE 38-8728 Y Inn CONKETE

287172

2e -n73

w 1433

6n º84 AY -3616

261403614

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27-027-01.0w -9r w.E28-1102- 2,-9146 TONINO 28-1102 anLuWE

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l'HILCO PAGE. 9-49

MODEL F1540(Ford) Schematic ,Parts Chassis Layout

FORD-PHILCO MODEL - F-1540 SINGLE UNIT RECEIVER

; DET.OSC. 6A7

-4-

= 260 K.C. FOR ALIGNIENT

SEE INDEX

MODEL F-1540 PARTS LIST lo. Description Part No.

O Antenna Lead 11-3386 ® Antenna Choke 32-1372 ® Condenser (10 tumid.) 30-1105 ® Antenna Translormer 32-2912 ® Tuning Condenser 31-2181 s First Padder (on 'tun. Cond )

(T) Condenser (.0o turd.) 30-4444 ® Sensitivity Control 33-5239 ® Condenser

(.01-.05-.25-.25-.5 mfd.) .30-4561 ® R. F. Transformer 32-2830 ® Second Padder (on 'l'un. Cond.)

Resistor (70,000 ohms) ..33-370344 Oe Condenser (6,000 (mmfd.) .30-4467

13 Third Padder (on Tun. Cond )

Oscillator Transformer 32-2828 ® Resistor (99,000 ohms) ..33-399344 d, Low Frequency Padder 31-0230 (0. Resistor(1,000,000 ohms) 33-510344 e Fodder (Pri. 1st I. F. Trans.) ® First I. F. Transformer 32-2286 QP Padder (Sec. 1st I. F. Trans )

95 Padder (Pri. 2nd I. F. Trans.) Second I. F. Transformer 32-2908 Padder (Sec. 2nd I. F. eons.) Condenser (250 mmfd.) 30-1032 Resistor (25,000 ohms) ..33-325344 Condenser (.01 mfd.) 30-4479 Resistor(1,000,000 ohms) 33-510344

éJ Condenser (110 mmfd.) 30-1031 4i5 Volume Control

(350,000 ohms) 33-5260 al Resistor (600 ohms) ...33-160331 95 R°sistor (20,000 ohms) ..33-320344 39 Resistor (40,000 ohms) ..33-340444

Resistor (13,000 ohms) ..33-313344 ® Condenser (250 mmfd.) 30-1032

95 Condenser (.01 mfd.) 30-4501

m

2No DET.

Ist' AUDIO

350,ODOA

(2) 59 Q RECTIFIER

`\ _ 1

1.I

i_T-Jr-48¡ T i 15

No. Description Part No. rnz t

95 Resistor (240.000 ohms) .33-424344 lsN_

9 Resistor (490,000 ohms) .33-449344 e Resistor (240,000 ohms) .33-424344

9u Condenser ('2DO mmfd.) 30-1032 30-4495 30-4495 32-7946 42-1406 Go 1

30-1032 45-2608 03.- 34-2039 r- 32-9263

....30-1032 30-4474 m 32-1374 3u.

.30-1032 mce 33-5260 r- 32-1644 I 32-2911 lac, 30-4474 r..ó f

41-3170-3 t ab

H1)

®

8 N17

3 ®

Condenser (.02 mtd.) Condenser (.02 rntd.) Output Transformer Tone Control Switch Condenser (250 mmfd.) Cone & Voice Coil Pilot Lamp Field Coil Assembly Condenser (250 mmfd.) Condenser (.5 mfd.) "A" Choke Condenser (250 mmfd.) On -OR Switch Filament Choke Vibrator Choke Condenser (.5 mfd.) Vibrator Resistor (200 ohms) .

® Power Transformer .. . ..32

59 Condenser (7.500 mmfd.) -.30-4420 ß m "B" Filter Choke .. .32-7943 a Filter Condenser (4-8 mid.) 30-2295 m

e5 Choke 32-1561 ® Condenser (250 mmfd.) ....30-1032 Ir

Foúr Prong Socket ........27-6044 ww Five Prong Socket .........27-6035 =9-7. Six Prong Socket ..27-6036 vw Seven Prong Socket 27-6037 mce Speaker Socket 27-6030 Receiver Housing 38-9384 Tuning & Volume Knob 27-4697 Dial Assembly 42-5826 Tuning Shaft 28-6795 Volume Shaft 28-8837

...33-120344 c

K.!

DECE1IBEß, 15, 1937

TEST TERMINAL



50 PHILCO MODEL F1540(Ford) Control Details Antenna


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PHILCO PAGE 9-51

PHILCO RADIO & TELEV. CORP. SDDEL L1560 (Lincoln Zephyr) Schematic,Parts Chassis Layout

LINCOLN ZEPHYR - PHILCO MODEL - L-1560 TWO UNIT RECEIVER

DECEMBER 16, 1937

4.

V

MODEL L-1560 PARTS LIST No. Description Part No. C) Antenna Choke 38-8106 Q Antenna Choke 38-8106

Condenser (50 mmfd.) 30-1029 Antenna Transformer 32-2914 Tuning Condenser 31-2161 First Padder (on Tun. Cond )

Condenser (.05 mfd.) 30-4444 Condenser (.01-.05-.25-.5-2 mid.) 30-4493

Q Resistor (600 ohms) 33-1212 R. F. Transformer 32-2830 Second Padder (on Tun. Cond.)

® Resistor (70,000 ohms) .33-370344 Condenser (6,000 mmfd.) .30-4467 Third Padder (on Tun. Cond )

Oscillator Transformer 32-2829 iCondenser (250 mmfd.) 30-1032 Resistor (99,000 ohms) .33-399344 Low Frequency Padder 31-6230

iResistor (45,000 ohms) .33-345344 Resistor(1,000,000 ohms) 33-510344 Condenser (250 mmfd.) . 30-1032

® Padder (Pri. 1st I. F. Trans )

O First I. F. Transformer 32-2791 Q Padder (Sec. 1st I. F. Trans )

§Padder (Pri. 2nd I. F. Trans )

®j Second I. F. Transformer 32-2793 Padder (Sec. 2nd I. F. Trans.) Condenser (250 mmfd.) 30-1032

® Resistor (25,000 ohms) .33-325344 63) Condenser (.01 mfd.) 30-4479 ® Resistor(1,000,000 ohms) 33-510344

cc ® Volume Control (350,000 ohms) 33-5246

I-- g Condenser (110 mmfd.) 30-1031 };

0 Resistor (600 ohms) ..33-160331

1.Nooa LL Resistor (20,000 ohms) .33-320344 6 Resistor (40,000 ohms) .33-340444 I> 2

Resistor (240,000 ohms) 33-424344

di) Resistor (3,000 ohms) ..33-230344

® Resistor (490,000 ohms) 33-449344 -4( Condenser (.01 mfd.) 30-4145

54 Condenser (250 mmfd.) 30-1032 Input Transformer 32-7779

© O O O O O

6Y7G TUBE 78TUBE42 OUTPUT . I.F.

A' 3'.1.--f113 T VIBRATOR LEAD DRIVER

®75TUBE 2"? DET. IST>AUDIO 65

No. Description Part Ne. ® Condenser (.03 mfd.) 30-4447 ® Resistor (15,000 ohms) .33-315344 ® Tone Control Switch 42-1377 4) Condenser (2,000 mmfd.) 30-4177 ® Output Transformer 32-7778 0 -Choke 32-1374

Condenser (250 mmfd.) 30-1032 ® Cone & Voice Coil 36-3159 ® Field Coll Assembly 36-3513 63 On & Oil Switch 42-1369 () Pilot Lamp 34-2039 (s) Condenser (250 mmfd.) 30-1032 (3 Condenser (.5 mfd.) 30-4474 (63 "A" Choke 32-1374 6 Filament Choke 32-2729 ít Je Condenser (250 mmfd.) 30-1032 4o Vibrator Choke 32-2537 ei Condenser (.5 mfd.) 30-4474 U Vibrator 41-3170-3 e)a Resistor (200 ohms) 33-120344 e)i Power Transformer 32-7720 © Condenser (7,500 mmfd.) 30-4420 e Filter Condenser (4-8 mfd.) 30-2167 Q Filter Choke 32-7811 Q "B" Choke 39-1281

e Condenser (250 mmfd.) 30-1032 r Condenser (250 mmfd.) 30-1032 63 Choke 32-2657

Receiver Housing 38-9340 Four Prong Socket 27-6044 Five Prong Socket 27-6035 Six Prong Socket 27-6036 Seven Prong Socket 27-6037 Seven Prong Socket

Octal Base 27-6087 Fuse 7227 Fuse Insulator 27-7729 Tuning Shaft 28-8821 Volume Shaft 28-8822 Tone Shaft 28-8823 Scale Assembly 42-5803 Tuning & Volume Knob 27-4691 Knob Base 28-7284 Switch Lever 28-7255

84TUBE ' 6A7 TUB RECTIFIER DET.05C.

FIGURE. 2

@John F. Rider, Publisher


pA('1E 9-52 PHILCO MODEL F1540 mat, L1560 Socket,Triimmers Alignmsnt


MODEL L- 1 5 6 0 ANTENNA - WHEN PADDING TILE ANTENNA

STAGE IT IS EXTREMELY IMPORTANT THAT THE PROPER DUMMY ANTENNA RE CONSTRUCTED AND USED.

w1lüiBJ.!MNI



PHILCO PAGE 9-53

ANTE

MODEL C1550(Chrysler PHILCO RADIO & TELEV. CORP Sohematic,Parts

Chassis layout CHRYSLER - PHILCO MODEL C - 1550

THE MODEL C-1550 HAS BEEN DESIGNED FOR INSTALLATION IN THE CHRYSLER CORPORATION BUILT CARS

FOR USE WITH A CHRYSLER "ROADW AY DUAL" OR A "SKYWAY" ANTENNA ANT

No.

No. Description Part No. 1+.7

Antenna Choke 32-2063 C ® Antenna Switch 42-1259 v Condenser (50 mmtd.) 29 Q Antenna Transformer 32-2433 C) First Padder (on Tun. Cond )

O Tuning Condenser 31-2169 () Condenser

(.15-.25-.25-.25-.5 mfd.) .30-4557 Condenser (.05 mfd.) 30-4444

O Resistor(1,000,000 ohms) 33-510344 R. F. Transformer 32-2231

u Second Padder (on Tun. Cond.) Q Resistor (70,000 ohms) .33-370344 0 Condenser (6,000 mmfd.) 30-4467 i+ Sensitivity Control 33-5261 () Third Padder (on Tun. Cond )

3 Oscillator Transformer 32-2232 Condenser (250 mmfd.)

ü Low Frequency Padder 31-6056® ® Resistor (99,000 ohms) ..33-399344® Q Resistor (45,000 ohms) .33-345344

2JPadder (Pri. 1st I. F. Trans.) First I. F. Transformer 32-2286

O Padder (Sec. 1st I. F. Trans.) Q Condenser (.1 mfd.) 30-4499 Q Resistor (1,500 ohms) ..33-215344 St Padder (Pri. 2nd I. F. Trans.) e Second I. F. Transformer 32-2167 e Padder (Sec. 2nd L F. Trans.) ® Condenser (250 mmfd.) 30-1032 91

Condenser (2(151 ,000mmfd.)

.33-325344 30 1031 g Resistor (330,000 ohms) 33-433344 O Condenser (.01 mfd.) 30-4479 O Volume Control

(1,000,000 ohms) 33-5257 g Resistor (6,000 ohms) ...33-260344 ® Resistor (600' ohms) 33-1212 O Resistor (20,000 ohms) ..33-30344 e Condenser (.05 mfd.) 30-4444 O Resistor (40,000 ohms) ..33-340444 e Resistor (240,000 ohms) .33-42434.4 (i'D Resistor (490,000 ohms) .33-449344

Resistor (240,000 ohms) .33-424344 Condenser (.01 mfd.) 30-4501

+ Condenser (250 mmfd.) 30-1032

OO Condenser (6, Condenser (.03

000 30-4024 30-4560

/78 DI`T .bsc.

61A7

01 NOTE THIS SIDE OFA BATTERY 1_ GROUNDED TO C

(i0.AYE O<CAR

I.F.=260 KC NOVEMBER 10, 1937

MODEL C - 1550 PARTS LIST 42TUBE OUTPUT Description Part No.

Tone Control Switch 42-1399 Output Transformer 32-7942 Condenser (250 mmfd.) 30-1032 Cone & Voice Coil 45-2607 Field Coil Assembly 36-4012 Complete Speaker (K-50) 36-1376 Condenser (.25 mfd.) 30-4557 Resistor (1,500 ohms) ...33-215344 Accessory Speaker 36-1281 On -OR Switch 42-1368 Pilot Lamp 34-2040 Condenser (.5 mfd.) 30-4474 Condenser (250 mmfd.) 30-1032 "A" Choke 32-1374 Condenser (250 mmfd.) 30-1032 Filament Choke 32-2729 Vibrator Choke 32-2812 Condenser (.5 mid.) 30-4474 Vibrator 41-3170-3 Resistor (200 ohms) 33-120344 Power Transformer 32-7911 Condenser (7,500 mmfd.) 30-4420 Filter Choke 32-7722 Filter Condenser (4-8 mfd.) 30-2179 Condenser (250 mmfd.) 30-1032 Condenser (25 mmfd.) 30-1067 Receiver Housing 38-2123 Accessory Speaker Socket 27-6025 Four Prong Base Socket 27-6044 Five Prong Base Socket 27-6035 Six Prong Base Socket 27-6036 Seven Prong Base Socket 27-6037 Receiver Mtg. Plate 28-4650 Fuse 45-2559 Tuning Shaft (P-6, D-8) 28-8842 Tuning Shaft

(S-5, C-18, C-19) 28-8845 Tuning Shaft (C-20) 28-8848 Volume Shaft (P-6, D-8) 28-8843 Volume Shaft

(S-5, C-18, C-19) 28-8846 Volume Shaft (C-20) 28-8849 Tone Shaft (P-6, D-8) 28-8844 Tone Shaft

(S-5, C-18, C-19) 28-8847 Tone Shaft (C-20) , 28-8850 Tuning & Volume Knob(P-6) 27-4659 Tuning & Volume Knob(D-8) 27-4660

I.F 78

2ND OCT. iSTAt10iO

75 OUTPUT

42 .03µp 4 D o

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FIGURE 1

o 78FBE©

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2"° PET. ED'TUa .A7TUBE A LEAD I9?AUDIO (1) CDO ® ®RECTIFIER DEI OSC. ® VIBRATOR

FIGURE 2

Description Part Ns.N.. Tuning & Volume Knob(S-5) 27-4661 Tuning & Volume Knob

(C-18, C-19) 27-4662 Tuning & Volume Knob

(C-20) 27-4692 Tone Knob (P-6) 27-4665 Tone Knob (D-8) 27-4666 Tone Knob (8-5) 27-4667 Tone Knob (C-18, C-19) 27-4668 Tone Knob (C-20) 27-4693

Description Part No. Scale Assembly (P-6, D-8) 42-5637 Face Assembly (S-5) 27-5376 Face Assembly

(C-18, C-19, C-20) 27-5377 Pointer Shaft Assembly

(S-5, C-18, C-19, C-20) 42-5802 Distributor Resistor 33-1113 Interference Condenser 30-4007 Interference Condenser 30-4490 Receiver Mtg. Bolt W-825 Receiver Mt'. Nut W-98

PACTE 9-54 PHILCO

Socket ,Tr iImrier s

Alignment,Controls DetailS,Parts

IMP ' II

. N V



I'HII,CO PAGE 9-55 I/AGI'. 9-56 l'HILC'O

MODEL 39-55 Schematic

I'HILCO RAI)IO & TELEV. CORP.

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hiCDEIS 39-55,39-116 Cont.Freq.Amplifier PIIII.CO I4À1)IO & 'l'ELEV. CORP. Adjustments Adjusting Frequency F quency Amplifier

The Mystery Control receivers are shipped with five (5) different control frequencies which range from 350 to 400 K.C. These are identified by code numbers appearing on the serial number ticket and on the rear of the chassis. These code numbers and frequencies are as follows:

Code 5-355 K.C. Code 6-367 K.C. Code 7-375 K.C. Code 8-383 K.C. Code 9-395 K.C.

The purpose of the different control frequencies is to prevent interaction l;etween two Mystery Control receivers which are on the same floor or are exceptionally close together. When several Mystery Control receivers are to be located close together, it. will be necessary to use different control frequencies to avoid interaction between the receivers. In order to prevent interaction between' receivers there should be a difference of 20 K.C. between their control frequencies.

If three receivers are to be operated at the same time and are closely situated, it will be advisable to adjust the control frequency of the first set to 355 K.C., the second set to 375 K.C. and the third to 395 K.C.

When realigning or changing the control frequency of the Mystery Control circuit, a Philco Model 077 Signal Generator with a coil of wire (about 4 or 5 turns -12" in diameter) attached to the output terminals is required. The leads between the coil of wire and Signal Generator should be long enough so that the coil of wire can be placed near the large secondary inductor in the bottom of the receiver cabinet.

With this apparatus, the Control Frequency is adjusted as follows:

1. With the temporary coil of wire in the center of (or near) the secondary inductor, the control frequency to which the Mystery Control Amplifier is tuned can be determined by tuning the Signal Generator between 350 and 400 K.C. When the Signal Generator is tuned to the control frequency, the Thyratron (2A4G) tube will glow (blue haze). If this frequency is to be used, leave the Signal Generator indicator at this point or turn the indicator to any other frequency desired between 350 and 400 K C.

2. When the control frequency is selected, turn the sensitivity control (117) in Model 116 and (89) Model 55

Schein. No. Description Part No.

1 Antenna Transformer ... 32-3056 2 Tubular -Condenser (.05 mfd.).... 30-4519 3 Tuning Condenser ... .. 31-2311 4 Mica Condenser (250 mmfd.) 301032 S Resistor (32,000 ohm -y, watt) 33-332339 6 Oscillator Transformer 32-2120 7 Compensator 31 6230 8 Resistor (10,000 ohm -1/4 watt) 33-310339 9 Resistor (5.000 ohm -2 watt).. 33-250539

10 Resistor (13,000 ohm -1 watt) 33-313339 11 Electrolytic Condenser (4 mfd.--

250 V.) ........ .... .. 30-2334 12 Tubular Condenser (.05 mfd.) 30-4123 13 1st I.F. Transformer Assembly 32-3089 14 2nd I.F. Transformer Assembly 32.2645 15 Mica Condenser (110 muid.) 30-1031 16 Resistor (2.0 meg.) 33 520339 17 Resistor (1.0 meg.) 11 510339 18 Tubular Condenser ( 01 mfd.) .... 30-4479 19 Mica Condenser (50 mmfd.) 10.1029 20 Resistor (70,000 ohm) 33-370339 21 Volume Control (2 meg.) 33-5300 22 Tubular Condenser (.004 mfd.) 30 4334 23 Resistor (1 meg.) .... 33 510339 24 Tubular Condenser (.015 mfd.) 30-4358 25 - Tone Control (3.0 meg.) 33-5287 26 Tubular Condenser (.02 mid.) 30-4481 27 Resistor (99,000 ohm) . .. . 33-399339 28 Resistor (330,000 ohm) 33-433339 29 Resistor (490,000 ohm) 33.449339 30 Tubular Condenser (.03 mfd.) 30-4517 31 Tubular Condenser (.01 mfd.) .. 30-4501 32 Resistor (3500 ohm) .. 33-235339 33 Tubular Condenser (101 mfd.) 30-4501 34 Output Transformer 32-7997 3S Voice Coil & Cone Assembly (Spkr

No. 36-1450) 36-4089 36 Tubular Condenser (.01 mfd.) 30-4501 37 Resistor (3,000 ohm -1/4 watt) 33-230339 38 Tubular Condenser (.1 mfd.) 30-4499 39 Resistor (1 meg.) 33-510339 40 Electrolytic Condenser (25 mfd.--

300 V.) 30-2360 41 B.C. Resistor 33-3361 42 Electrolytic Condenser (18 mid. -

475 V.) 30-2200 43 Field Coil Replace Speaker

No. 36-1450 44 Power Trans. (115 V., 50 to 60

cycles) 32.7999 Power Trans. (115 V., 25 to 40

cycles) 32-8013 45 Condenser (.05 mfd.) (HO V. Plug) 30-4576 44 Pilot Light Bulb (Bullseye) 34.2210 47 Pilot Light Resistor (16 ohm -1

watt) 33016431

MODEL 39-55 Parts

located on the left rear of the chassis -towards the position marked "extreme." Using the 2A4G Thyratron tube as a resonance indicator, adjust padders (103), (115), (119) in Model 116 and (74), (85), (90) in Model 55 for maximum signal. This will be indicated by the brilliance of the glow in the 2A4G Thvratron tube. As the padders are adjusted, gradually turn the sensitivity control to the "near ' position or reduce the output from the Signal Generator. When the padders are correctly adjusted to maximum, the Thyratron will glow with the sensitivity control (117) at the "near" position and with a very weak signal from the Signal Generator.

3. Next, adjust the padding condenser (121) in Model 116 and (92) in Model 55 on the secondary inductor located in the bottom of the receiver. The padding condenser is located in 'one corner of the secondary inductor and is encased in a cardboard container. This padding condenser should be carefully adjusted for maximum glow in the 2A4G tube. Use the weakest signal possible from the Signal Generator that will cause the 2A4G to glow. Also, have the sensitivity control as close as possible to the "near" position. Extreme care should be used in adjusting the padder to the exact point of resonance, as the secondary inductor is a very sharply- tuned circuit. After adjusting the circuit, remove the Signal Generator and loop from the receiver.

4. The Mystery Control unit is now adjusted as follows A. Dial any one of the stations indicated on the remote

unit by pulling the selector to the "Stop" position. Then, as the dial is released at the "Stop," press the "Stop" down and hold it in this position.

B. Holding the "Stop" in this position, bring the Mystery Control unit close to the receiver. Using the padding wrench, tune the padding screw (126) located on the bottom of the unit until the 2A4G Thyratron in the receiver glows at full brilliance.

Now, turn the sensitivity control on the receiver towards the "near" position until a point is reached where the 2A4G tube almost stops glowing. Then readjust the padder (126) of the unit again for maximum brilliance in the 2A4G tube. The Mystery CoA- trol unit should now he adjusted to the same frequency as the control frequency ;n the receiver.

Replacement Parts Sc he m.

Vo. Description Part No. 48 Filament Transformer (I15 .V.. 50

to 60 cycles) 32-7993 Filament Trans. (115 V., 25 to 40

cycles) 32.8016 49 Pilot Lamp Bulbs (Dial) 34-2064 50 Motor Trans. (115 V., 50 to 60

cycles) 32-7990 Motor Trans. (115 V.. 25 to 40

cycles) 32.8015 51 Volume Control Motor Assembly 35-1151 S2 Rotary Switch 42-1468 53 Resistor -Bias 13.3363 54 Pilot Lamps (Station Indicator) 34-2064 55 Resistor (150 ohm) 33-115339 56 Volume Control Switch (Motor Con-

trol)

57 Tubular Condenser (.1 mfd.) 42-146930.4499

58 Condenser (.1 mfd.) 30-4499 59 Electrolytic Condenser (30 mid.-

30-2361 60 Push Button Compensator Strip 316264 60A Compensator No. 1 (540-1030 K C.C.) 608 Compensator No.2 (540-1030 K.C.) 60C Compensator No. 3 (670-1160 K.C.) 600 Compensator No. 4 (670-1160 K.U. ) 60E Compensator No.5 (900--1470 K.C.) 60F Compensator No. 6 (900-1470 K.C.) 606 Compensator No.7 (1170-1600

K.C.) 60M Compensator No. 8 (1170-1600

K.C.) 61 Electric Push -Button Coil Assent.

blr 32.3091 61 A t tscillator Coil No. I

(540-1030 K.C.) 32-3042 618 Oscillator Coil No. 2

(540-1030 K.C.1 32.3042 61C Oscillator Coil No. 3

(670--1160 K.C.) 32.3042 61D Oscillator Coil No. 4

(670-1160 K.C.) 32-3042 61E Oscillator Coil No. 5

(900-1470 K.C.) 32.3041 61F Oscillator Coil No. 6

(900-1470 R.C.) 32-3041 61G Oscillator Coil No. 7

(1170-1600 K.C.) 32-3041 61I4 Oscillator Coil No. 8

32-3041 (1170-1600 K.C.) 62 Silver Mica Condenser (370 mmfd ) 30-1110 63 Silver Mica Condenser (370 mmfd ) 30-1110 64 Bakelite Condenser ( 05 mfd.) 3615 -SC. 65 Resistor (150 ohm --wirewnuud) 333,162 66 Electrolytic Condenser (16 mfd.-

200 V.) 30.2356

Schein. No Description Part No. 67 Choke Coil 32 t281 68 Tubular Condenser (.05 mfd.) 30 4123 69 Tubular Condenser (.05 mfd.) 30-4123 70 Tubular Condenser (.1 mfd.) .. 30-4499 71 Tubular Condenser (.5 mfd ) .. 30-4551 72 Resistor (4,000 ohm -'/a watt). . 33.240339 73 Resistor (51 000 ohm -1/4 watt) . . 33.351339 74 No. 3 Control Amp. Coil.... .. . 32-3088 75 Tubular Condenser ( 02 mfd.). 30-4516 76 Resistor (750.00') ohm) 33475339 77 Tubular Condenser (.05 mfd.) 10 412.1 78 Resistor (99.000 ohm) 33 3993.39 79 Mica Condenser (550 mmfd.) 30-1092 80 Tubular Condenser (.05 mfd.)... 30.4123 81 Resistor (99.000 ohm) 3i 3993.39 82 Tubular Condenser (.05 mfd.)... . .10-4444 83 Resistor (1.5 meg.- 1/4 watt) 11.515339 84 Tubular Condenser (.05 mfd.) 304519 85 No 2 Control Amp. Cod.... . . 32-ìO87 86 Resistor (1 0 meg. '1/4 watt) - 33-510339 87 Tubular Condenser (.05 mfd.)..... 304444 88 Resistor (300 ohm) 33-330339 89 Sensitivity Control (50.000 ohm)... 335295 90 No. 1 Control Amp Coil... .. . 32-.3086 91 Silver M:ca Condenser (155 mmfd.) 30-1121 92 Air Padder (Secondary Inductor).. 31.6268 93 Secondary Inductor Cabinet .. . 40-6414 94 Range Switch 42 1454

Miscellaneous Parts Bezel Assembly (Cabinet) 38-9746 Bezel Screws W-1835 ('able (Tuning Drum) ....... .. 31-2315 Cable (Pointer) .......... .... .31-2320 Dial 27.5422 Dial Pointer Sti-1033 Disc (Tuning) 274766 Disc (Volume) 27.4765 Disc (Range Switch) 27-4769 Disc (Tone Control) 27.4764- Pilot Lamp Assembly 389694 Pilot Lamp Assembly 38-9711 Pilot Lamp Assembly 38.9712 Socket (4 Prong) 27-6044 Socket (5 Prong) 27-6035 Socket (6 Prong) 27.60.36 Socket (7 Prong)

ket P Socket (6 Prong)rong) Socket (7

27-6086 27 6099

Speaker 36.1450 Spring (Tuning Cables)... 28-8917 Washer (Keyed Washer Tuning

Diac) 56.1029 W asher (Spring Washer Tuning

Disc) 6717

©John F. Rider, Publisher ©John F. Rider, Publisher www.americanradiohistory.com

l'HILCO PAGE 9-57 l'AGE 9-58 I'HILCO MODEL 39-55 Chassis Layout

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PIIILCO RADIO & TELEV. CORP. Tri rs,Dial Drive "Mystery Control" 1 i Schematic

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P,IJDELS 39-55,39-116 Alignment PIIILCO RADIO & TELEV. CORP.

Alignment of Compensators and Mystery Control Models 39-5 5, 39-116 EQUIPMENT REQUIRED: OUTPUT METER:

The Philco 027 Output Meter is connected to the plate (1) Signal Generator; Philco Model 077. terminals of the type 42 tubes and adjusted for the 0 to 30

V.A.C. scale. After connecting the output meter, adjust the (2) Output Meter, Philco Model 027 Circuit Tester. compensators in the order as shown in the tabulations below.

(3) Philco Fiber Handle Screw Driver, Part No. 27-7059, and Locations of the Compensators are shown in Fig. 4. If the output meter pointer goes off scale when adjusting the corn -

Fiber Wrench, Part No. 3164. pensators, reduce the strength of the signal from the generator.

RADIO RECEIVER CIRCUIT ADJUSTMENTS Model 39-116

Opera-

SIGNAL GENERATOR RECEIVER

InInstructions C nnections to Receiver

Antenna (Note A)

Dial Setting

Dial Setting

Control Setting

Adjust Compensators

1 78 Grid .1 mfd. 470 K.C. 580 K.C. Vol. Max.

Range Switch Brdcst.

38A, 38B Turn Out 33B Full

2 6A8 Grid .1 mfd. 470 K.C. 580 K.C. Vol. Max.


33C, 33A, 33B, 38B Note B

3 Antenna and

Ground 150 mmfd. 1550 K.C. 1550 K.C. Vol. Max.


22, 10B, l0A

4 Antenna and



23 Rollgang

5 Antenna and



22

6 Antenna and

Ground 400 ohms 5.0 M.C. 5.0 M.C. Vol. Max.

Range Switch Police

22A

7

- Antenna and

Ground 400 ohms 18.0 M.C. 18.0 M.C. Vol. Max.

Range Switch Short Wave

22B, 16, 4 Note C

RADIO RECEIVER CIRCUIT ADJUSTMENTS Model 39-55

Opera- uo^

SIGNAL GENERATOR RECEIVER

Special Instructions Out ut

Connections to Receiver

Dumm Antenna (Note A)

Dial Setting

Dial Setting

Control Setting

Adjust Compensators

1 78 Grid .1 tnfd. 470 K.C. 580 K.C. Vol. Max.


14A, 14B Turn Out 13B Full

2 6J8G Grid .1 mfd. 470 K.C. 580 K.C. Vol. Max.


13C, 13A 13B, 14B Note B

3

Antenna and Ground 150 mmfd. 1550 K.C. 1550 K.C.

Vol. Max. Range Switch

Brdcst. 3B, 3A

4 Antenna and



7 Rollgang

5 Antenna and



3B, 3A Note C

NOTE C - SEE PAGE 9-56 FOR NOTE A-The "Dummy Antenna consists of a condenser connected in series

with the signal generator output lead (high .ide). Use the capacity as CONTROL FREQUENCY AMPLIFIER specified inn each step of the above procedure.

NOTE B-Dial Calibration: In order to adjust the receiver correctly the dial must be aligned to track properly with the tuning condenser. To adjust ADJUSTMUZITS FOR /MODELS the dial, proceed as follows: With the tuning condenser closed (maximum capacity), art the dial pointer on the extreme left index line at the low frequency end of the broadcast scale. The arrangement of the drive cable 39x.55 AND 39-116 is shown in Fig. 3.

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Miscellaneous Parts Bezel Assembly (Cabinet) 38-9732 Bezel Screws W.1835 Cable (Tuning Drum) 31-2315 Cable (Pointer) 31-2320 Dial 27-5428 Dial Pointer 38-1033 Dise (Tuning) 27.4768 Disc (Volume) 27-4785 Disc (Range Switch) 37-4767 Dine (Tone Control) 37-4784 Pilot lamo Assembly 38-9894 Pilot Lamp Assembly (Dial) 38-9711 Pilot Lamp Assembly (Tabs) 38-9712

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Rocket (4 prong) 27-6044 Rocket (5 prong) 27.6033 Market (8 prong) 37-8038 Rocket (7 prong) Octal 27-6057 Socket (8 prong) Octal 27-6086 Market (7 prong) Octal 274099 Speaker 38-1450 Storing (Tuning Cables) 28-8913 Washer (Keyed Washer Tuning Disc) 58.1029 Washer (Spring Washer Tuning Dime) 6717

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Mystery Control Unit Bezel 56-1240 Bezel Screws W-2138 Cap Tuning Disc 27-4793 Disc (Tuning) 27-4792 Pulser Assembly 38-9704 Stop (Tuning Disc) ' 27-4794 Rocket 14 prong) 27-8119 Screw (Finger Rion) W-2139 Sparer (Finger Stop) 27-4795

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2 PIER.-DELANE 2.101)E LS PR15M,PR15R,PR15X

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CRYSTAL BAND PASS

COIL

PIERSON-DE LANE CO.

BAND CHANGE SWITCH

CRYSTAL FILTER

TUBE LINE-UP- from antenna or input stage, is as follows:

1-6K7 tube, first RF stage. 5 BAND 9 ANTENNA COIL

2-6K7 tube, second RF stage. 3-6A8 tube, modulator or mixer tube. 4-6K6G tube, electron heterodyne oscillator. 5-6K7 tube, 1st IF stage. 6-6L7 tube, 2nd IF stage and noise silencer injector tube. 7-6Q7 tube, 2nd detector, AVC and 1st audio stage.

6V6G

BEAM OUTPUT

ANTENNA COILS

NOISE SILENCER TRANSFORMER

INJECTOR

I. F. No. 2

OSCILLATOR COILS

®, 000)

5 BAND MODULATOR COIL

8-6K7 tube, noise silencer amplifier. 9-6H6 tube, noise silencer rectifier.

1.0-6N7 tube, automatic threshhold tube 1 1-6V6G tube, output tube (push-pull) 12-6V6G tube, output tube (push-pull) 1 3-6J7 tube, inter -channel noise suppression or relay tube 1 4-6C5 tube, CW beat oscillator tube. 1 5-5X4G tube, rectifier tube.

16 MED.

FILTER

16

MED. FILTER

6 K 7

o FIRST

R. F. COILS

6K6G

ELECTRON HETERODYNE

OSCILLATOR

MODULATOR COILS

PUSH TO TALK JACK

INTER CHANNEL

NOISE

SUPPRESSOR

RELAY

POWER TRANSFORMER

BEAT OSCILLATOR

VOLUME REGULATOR

PSI H SUTTON

TO TRANSMITTER


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Fig

PIN,IIZSO1-1)li. I,ANIi. CO.

1 Fig. 2 Fig 3

BAND PASS FILTER-The band pass feature is equipped with variable selectivity control, which permits continuously variable band width from approximately 10 KC to 2 KC Un -retouched oscillo - grams are shown above. Fig. 1 shows the minimum. band width, while Figures 2 and 3 both show maximum band widths, but with different width screen sweep. The variable selectivity control permits setting of band width at any spot between these two points or widths; also the band pass feature has a rejection position, the oscillogram of which, is shown in Fig. 5. The vertical lines drawn over charts, except Fig. 3, indicate 10 KC per line. IOn Fig. 3 the

Fig. 6 lines indicate 5 KC each to show flat top more plainly.) We highly recommend this filter to the phone man who must operate in the crowded amateur bands, and also .to those DX'ers who require o high degree of selectivity plus high-fidelity. This type of filter also gives excellent single signal response for code work. N

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PR15C,PR15U1I Alignment,Oscill.ogams Filter Data

Fig. 5

CRYSTAL FILTER-Two distinctly different types of crystal filters are built into the PR-15-one the band pass type intended primarily for use in phone work; the other the usual series parallel filter, which gives ideal performance for code work, but may also be used for phone reception.

SERIES PARALLEL FILTER-The series parallel filter is of the usual type with a high degree of effi- ciency. Fig. 4 shows the series position set at maximum selectivity. The .selectivity shown may be decreased considerablyby use of the phasing control. The Series Filter gives the ideal condition of noise

reduction and selectivity for code reception. Fig. 5

and Fig: 6 show the selectivity when crystal is not m use

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PILGRIM PAGE 9-1

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PILGRIM ELECTRIC CORP.

106 /A4

t.77414 - ISM

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JJJ/KNlJ JNONMLO"

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Cl - .005 C2 - .1 C3 - .005 C4 - .1 C5 - .0001 C6 - .02 C7 - .006 C8 - .05

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IF PEAK 456 KC

MODELS DA,DAE MODELS DB,DF MODEL 210 Schematics

0j-1 Ó /OOM

000,

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PILOT RADIO CORP. 1!JDEL X 201 Scheiatic,Socket Irin ners,Chassis Parts



2 PILOT

MODEL X 201 Voltage,AlignLient MJDELS G352,G353 Voltage,lilignment

PILOT

MODEL X-201 SUPERHETERODYNE

Range: 176-557 Meters (1,710-538 kc.) Line Voltage: 115-125 volts, A.C. or D.C. Power Consumption: 45 watts. Undistorted Power Output: 2 watt. Intermediate Frequency: 456 kc. Tube Functions: 6A7 electron emission control, oscillator.

detector. 6D6 I.F. amplifier. 75 amplifier detector. 25L6 Class A power pentode. 25Z5 rectifier

Voltages: resistance measured

Read tube socket voltages with meter having of at least 1,000 ohms per volt. All voltages to chassis.

Type 6A7 6D6 75 25L6 25Z5 Plate 100 100 -* 90 - Cathode 3 3.8 1. 0 100 Screen 64 100 - 100 Heater 6.3 6.3 6.3 25 25 *Voltage measured through plate resistor. Speaker field voltage, 115 volts. Anode grid of 6A7, 85 volts.

REALIGNMENT: Should the receiver require realignment, the procedure outlined below should be followed. In the service information sheet, the location and function of the various alignment capacitors are clearly illustrated. For best results an external modulated oscillator with adequate frequency range, and a visual output meter, should be used.

Before connecting the chassis to the power line, reconnect the speaker cable in its socket at the rear of the speaker.

I. F. ALIGNMENT: When aligning the Intermediate Fre- quency Amplifier, the external oscillator must be set at 466 kc. The Band Switch should be in the position marked "Broadcast". and the tuning condenser should be set at maximum capacity. Connect the "antenna" lead of the external oscillator to the control grid of the type 6D6 tube in the I.F. Amplifier stage through a .1 mfd. fixed condenser. Connect the "ground" lead of the external oscillator to the receiver ground lead. The I.F. alignment capacitors are located at the top of the shielded I.F. Transformers. Rotate the adjusting screw of each capacitor on I.F. Unit No. 2 slowly until maximum output is noted. On completion of this operation, remove the external oscillator leads from the type 6D6 I.F. Amplifier tube and connect it in the seal. manner to the control grid at the top of the type 6A7 tube.

Now rotate each adjustment screw on I.F. Unit No. 1 for maximum output. During these operations, use the least possible input to prevent broadening of the resonance peaks.

In order to obtain the most accurate realignment of the I.F. Amplifier, it is essential to repeat the alignment procese in both I.F. units with the external oscillator leads connected across the control grid of the 6A7 tube.

WAVE TRAP ADJUSTMENT: With the oscillator still set at 956 kv., connect the oscillator to the antenna through a 200 mmfd. condenser. Then adjust the wave trap condenser for minimum deflection on the output meter.

BROADCAST ALIGNMENT: After the wave trap is adjusted, place the tuning control pointer at the 1400 kc. mark. Adjust the broadcast band oscillator trimmer to maximum response. Adjust the detector trimmer in the same manner.

Next adjust the 600 kc. padder condenser. Set the external oscillator at 600 kc. Rotate the receiver tuning control until resonance is indicated. Then rock the tuning control back and forth about this resonance position, and at the same time adjust the padder condenser for the highest resonance peak.

Now repeat the 1400 kc. trimmer adjustment, following in every detail the procedure previously described.

Connect the blue wire at the rear of the chassis to

your antenna and the black wire to the ground. If

you are not experienced in erecting antennas, we

strongly advise having this done by your radio service

man. If you use an ordinary single -wire antenna, put

up a single wire 50 to 100 ft. long, and as high above

surrounding objects as possible, bringing a lead from

the nearer end down to your set. For best reception,

however, use a Pilot DX10 Antenna.

RADIO CORP.

MODEL G-352 SUPERHETERODYNE Range: 16-52 Meters (18,800-5,700 kc.)

178-550 Meters (1,680-545 kc.) MODEL G - 353 SUPERHETERODYNE Range: 178-550 Meters (1,680-545 ,kc.)

789-2,142 Meters (380-140 kc.) (Available for sale outside of North America)

Line Voltage: 115-125 volts, A.C. or D.C. Power Consumption: 45 watts. Undistorted Power Output: 2 watt. Intermediate Frequency: 456 kc. Tube Functions: 6A7 electron emission control, oscillator -

detector. 6D6 I.F. amplifier. 75 amplifier detector. 25L6 Class A power pentode. 25Z5 rectifier

Voltages: resistance measured

Read tube socket voltages with meter having of at least 1,000 ohms per volt. All voltiges to chassis.

Type 6A7 6D6 75 25L6 25Z5 Plate 100 100 -* 90 - Cathode 3 3.8 1. 0 100 Screen 64 100 - 100 - Heater 6.3 6.3 6.3 25 25 *Voltage measured through plate resistor. Speaker field voltage, 115 volts. Anode grid of 6A7, 85 volts.

REALIGNMENT: Should the receiver require realignment, the outlined procedure below should be followed. In the service information sheet, the location and function of the various alignment capacitors are clearly Illustrated. For best results an external modulated oscillator with adequate frequency range, and a visual output meter, should be used.

Before connecting the chassis to the power line, reconnect the speaker cable in its socket at the rear of the speaker.

L F. ALIGNMENT: When aligning the Intermediate Fre- quency Amplifier, the external oscillator must be set at 466 kc. The Band Switch should be in the position marked "Broadcast". and the tuning condenser should be set at maximum capacity. Connect the "antenna" lead of the external oscillator to the control grid of the type 6D6 tube in the I.F. Amplifier stage through a .1 mfd. fixed condenser. Connect tie "ground" lead of the external oscillator to the receiver ground lead. The I.F. alignment capacitors are located at the top of the shielded I.F. Transformers. Rotate the adjusting screw of each capacitor on I.F. Unit No. 2 slowly until maximum output la noted. On completion of this operation, remove the external oscillator leads from the type 6D6 I.F. Amplifier tube and connect it In the same manner to the control grid at the top of the type 6A7 tube.

Now rotate each adjustment screw on I.F. Unit No. 1 for maximum output. During these operations, use the least possible input to. prevent broadening of the resonance peaks.

In order to obtain the most accurate realignment of the LF. Amplifier, it Is essential to repeat the alignment process in both I.F. units with the external oscillator leads connected acro=s the control grid of the 6A7 tube.

WAVE TRAP ADJUSTMENT: With the oscillator still set at 466 kc., connect the oscillator to the antenna through a 200 mmfd. condenser. Then adjust the wave trap condenser for minimum deflection on the output meter.

BROADCAST ALIGNMENT: After the I.F. amplifier is completely realigned, connect the external oscillator leads to the receiver antenna and ground leads with a .0002 mfd. condenser in the antenna lead. Set the Band Switch in the "Broadcast" position and place the tuning control pointer at the 1400 kc mark. Adjust the broadcast band oscillator trimmer to maximum response. Adjust the signal section trimmer to the same manner.

Next adjust the 600 kc. padder condenser. Set the external oscillator at 600 kc. Rotate the receiver tuning control until resonance is indicated Then rock the tuning control back and forth about this resonance position, and at the same time adjust the padder condenser for the highest resonance peak.

Now repeat the 1400 kc. trimmer adjustment, following in every detail the procedure previously described -

SHORT -WAVE ALIGNMENT: The procedure in aligning the short-wave bands is identical with that for the broadcast with the exception of the adjustment of the Dodder condenser. The alignment frequency Is 16.8 Meters-(17,800 kc.) Turn the Band Switch to the right. Tune the external oscillator to 16.8 meters. Tune the receiver so that the dial pointer is in a position co- incidental with the 16.8 meter indication on the dial scale. Adjust the short wave oscillator trimmer for maximum response. Next adjust the signal circuit trimmer fpr maximum resonance. Repeat all adjustments to assure correct alignment, roeldng the gang condenser to right or left for maximum gain.

THE LONG WAVE ALIGNMENT: Procedure in the Model la similar to the Broadcast section of that receiver. Align

at 876 ke. Adjust the padder at 160 ke. Should it be necessary to remove the band switch amemFy,

it is advisable to realign the receive! alter reinstalling.



PILOT PAGE 9-3

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1BDDEL G 284 Alignment Notes

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Tranex AC -DC Model G-284,

Three tuning bands covering 12-94 m. REMOVAL OF CHASSIS FROM CABINET:

To remove the chassis from the cabinet proceed as follows:

Be certain that the line cord is removed from the power outlet socket.

Remove the "slip-on" knobs and felt washers from the controls and loosen the set screw on the tuning knob.

Remove the speaker plug from its socket.

Remove the four mounting screws, located underneath the cabinet.

Remove the tuning beam plug from the socket at the front of the chassis.

REALIGNMENT: Should the receiver require realignment, the procedure outlined below should be followed. For best results an external modulated oscillator with adequate frequency range, and a visual output meter, should be used.

Before connecting the chassis to the power line, reconnect the speaker cable in its socket at the rear of the chassis.

The R. F. alignment trimmer condensers are mounted on the side of the coil shields.

I. F. ALIGNMENT: When aligning the Intermedi- ate Frequency Amplifier, the external oscillator must be set at 456 kc. The Band Selector Switch should be in the position marked "Broadcast", and the tuning condenser should be set at maximum capacity. Connect the "antenna" lead of the external oscillator to the control grid of the type 6K'7 tube in the I. F. Amplifier stage through a .1 mfd. fixed condenser. Connect the "ground" lead of the external oscillator to the receiver ground lead. The I. F. alignment capacitors are located at the side of the shielded I. F. Transformers. Rotate the adjusting screw of each capacitor on I. F. Unit No. 2 slowly until maximum output is noted. On completion of this operation, remove the external oscillator lead from the type 6K7 I. F. amplifier tube and connect it in the same manner to the control grid at the top of the type 6A8 tube.

Now rotate each adjustment screw on I. F. Unit No. 1

for maximum output. During these operations, use the least possible input to prevent broadening of the resonance peaks.

In order to obtain the most accurate realignment of the I. F. amplifier, it is essential to repeat the alignment process in both I. F. Units.

CAUTION: When making repairs on the receiver, use only ROSIN CORE SOLDER. NEVER USE SOLDERING PASTE OR ACID FLUXES OF ANY TYPE.

for 110-125 V. (50-60 Cycles)

(25,000-3,200 kc.) and 187-560 m. (1,600-535 kc.)

BROADCAST ALIGNMENT: After the I. F. amplifier is completely realigned, connect the external oscillator leads to the receiver antenna and ground leads. Insert a 200 mmf. condenser in series with the antenna lead. Set the Band Selector Switch in the "Broadcast" position and place the tuning control pointer at the 1500 kc. mark. Adjust the broadcast band oscillator trimmer.

Next adjust the interstage alignment trimmer for maximum response. Finally adjust the antenna section trimmer in the same manner.

Next adjust the 600 kc. padder condenser, located on the top of the oscillator coil. Set the external oscillator at 600 kc. Rotate the receiver tuning control until resonance is indicated. Then rock the tuning control back and forth about this resonance position, and at the same time adjust the padder condenser for the highest resonance peak.

Now repeat the 1500 kc. trimmer adjustment, following in every detail the procedure previously described.

ALIGNMENT OF THE SHORT WAVE-BANDS:- The procedure in aligning the short wave -bands is identical with that for the broadcast with the exception of the adjustment of the padder condenser. Insert a 400 ohm non -inductive resistor in series with the antenna lead. The alignment frequencies are as follows:

Band 2: 31.6 Meters-( 9,500 kc.)

Band 1: 12.5 Meters-(24,000 kc.)

When aligning Band 2, set the Band Selector Switch in the position marked "Band 2". Set the tuning control pointer at 9,500 kc. meters. Adjust the oscillator alignment capacitor on Band 2 for maximum output. Next adjust the interstage and antenna section alignment capacitors for maximum output.

To align Band 1, set the Band Selector Switch in the position marked "Band 1". Set the tuning control pointer at the 24,000 kc. meter mark. Set the external oscillator at 24,000 kc. meters. Adjust the oscillator section alignment capacitor on Band 1 for maximum output.

Proceed next to align the interstage section of Band 1.

In doing this, it is essential to rock the tuning control back and forth about the resonance position and at the same time to adjust the trimmer for the highest resonance peak. Next align the antenna section for maximum sensitivity. ANTENNA

If you use an ordinary single -wire antenna, connect the antenna to the blue lead on the set. Connect both the black and yellow leads to the ground, or connect the yellow lead to the ground and leave the black lead free-which- ever gives better reception.

PHONOGRAPH PICK-UP: A jack is provided at the rear of the chassis for plugging in an electric phonograph pick-up, in order that records can be reproduced by the loudspeaker, through the high -quality amplifier with which this set is equipped. The pick-up should be of the high - impedance type.



PILOT PAGE 9-5

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MODELS BG 562, BG563 Voltage,Alignment PILOT RADIO CORP.

SERVICE INFORMATION FOR PILOT MODELS BG -562 AND BG -563

REMOVAL OF CHASSIS FROM CABINET:

To remove the chassis from the cabinet proceed as follows:

Be certain that the line cord is removed from the power outlet socket.

Remove the knobs and felt washers from the controls on the front panel, and loosen the set screw on the tuning knob.

Remove the speaker socket from the plug mounted on the speaker.

Remove the four mounting screws, located underneath the cabinet and pull chassis out.

REALIGNMENT: If the receiver requires alignment, the procedure outlined below should be followed. In the schematic diagram sheet, the location and function of the various alignment capacitors are clearly illustrated. For best results, an external modulated oscillator with adequate frequency range and a visual output meter, should be used.

Before connecting the chassis to the power line, reconnect the speaker cable in its socket at the rear of the chassis.

I. F. ALIGNMENT: When aligning the Intermediate Frequency Amplifier, the external oscillator must be set at 456 kc. The Band Switch should be in the position marked "Broadcast", and the tuning condenser should be set at maximum capacity. When aligning the receiver on all positions, the volume control and the tone control should be turned to the maximum clockwise position. Con- nect the antenna lead of the external oscillator to the control grid of the 6K7G tube in the I. F. Amplifier through a .1 mfd. fixed condenser. Connect the ground lead of the external oscillator to the chassis. The I. F. alignment trimmers are located at the top of the shielded I. P. Transformers. Rotate the adjusting screw of each capacitor on I. F. Unit No. 2 slowly until maximum output is noted. Following this, connect the external oscillator leads to the control grid of the 6A8G tube. Adjust each trimmer on I. F. Unit No. 1 for maximum gain.

During these operations, use the least possible input to prevent broadening of the resonance peaks.

In order to obtain the most accurate realignment of the I. F. amplifier, it is essential to repeat the alignment process in all I. F. Units, with the external oscillator leads connected to the control grid of the 6A8G tube.

WAVE TRAP ADJUSTMENT: With the oscillator still set at 456 kc., connect the oscillator to the antenna through a .0002 mfd. condenser. Then adjust the wave trap condenser for minimum deflection on the output meter.

BROADCAST ALIGNMENT: After the I. F. amplifier is completely realigned, connect the external oscillator leads to the ieceiver antenna and ground through a .0002 mfd. condenser. Leave the Band Switch in the "Broad- cast" position and place the tuning control pointer at the 1500 kc. mark. Tune the external oscillator to 1500 kc. Adjust the broadcast band oscillator trimmer to maximum response.

Next adjust the interstage alignment trimmer for maximum response. Finally adjust the antenna section trimmer in the same manner.

Next adjust the 600 kc. padder condenser, located in the center of the chassis on the under side. Set the external oscillator at 600 kc. Rock the receiver tuning control around the resonance position, and at the same time adjust the padder condenser for the highest peak.

Now repeat the 1500 kc. trimmer adjustment, following in every detail the procedure previously described.

The alignment frequencies are as follows: Longwave Band -800 meters (375 kc.) Broadcast Band - 200 meters (1,500 kc.)

Band 1-16.7 meters (18,000 kc.) BAND 1: Align Band 1 in a similar manner using a

400 -ohm non -inductive resistor in place of the .0002 mfd. condenser. The alignment frequency is 18,000 kc. (16.7 meters).

The alignment of Band 1 requires greater care due to the higher frequencies covered by this band. Rotate the tuning condenser of the receiver until the dial pointer is co -incidental with the 18,000 kc. indication on the dial scale. Adjust the oscillator trimmer condenser for maximum sensitivity. Proceed next to align the detector section. In doing this it is essential to rock the tuning control back and forth about the resonance position and at the same time to adjust the trimmer for the highest resonance peak.

THE LONG WAVE ALIGNMENT procedure in the Model BG -563 is similar to that of the broadcast. Turn the Band Switch to the Long Wave position. The alignment frequency is 375 kc. Adjust the padder condenser at 150 kc. Use a .0002 mfd. condenser in the antenna lead from the external oscillator.

REMOVAL OF BAND SELECTOR SWITCH ASSEMBLY: Should it be necessary to remove the switch assembly, it is advisable to realign the receiver after reinstalling it.

CAUTION: When making repairs on the receiver, use only ROSIN CORE SOLDER. NEVER USE SOLDERING PASTE OR ACID FLUXES OF ANY TYPE.

RECEIVER DESCRIPTION Operating Voltages -115, 125, 150, 220, 240 volts, Alter-

nating Current. Frequency Rating-SO to 60 cycles. Power Consumption -60 watts. Tubes -1 type 6A8G, i type 6K7G, 1 type 6H6G, 1 type

6J7G, 1 type 6F6G, 1 type 5Y3. Undistorted Power Output -3 watts. Intermediate Frequency -456 kc.

Tube Functions -- Type 6A8G: Electron emission control oscillator -

detector. Type 6K7G: I. F. amplifier. Type 6H6G: Duo -diode detector. Type 6J7G: A. F. amplifier. Type 6F6G: Class "A" power pentode. Type 5Y3: Full -wave rectifier for power utpply.

VOLTAGES The D. C Voltages measured at the tube sockets of the set should be

read with a high resistance voltmeter of at least 1000 ohms per volt. OSC. DET. I. F. DIODE A. F. POWER Type 6A8G Type 6K7G DET. AMP. PENTODE

Plate 240 240 Cathode 2.6 2.6 Screen 70 70 Filament 6.3 6.3 Osc. Anode 180

Type 6H6G Type 6J7G Type 6F6G

RECTIFIER Type 5Y3

60. 220 5 310

23 240 6.3 6.3 6.3 5.

*Voltages measured through high resistance. Speaker field voltage 90 volta. All plate voltages measured to cathode. All voltages measured to chassis frame.



l'II.OT PAGE 9-11

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PILOT PAGE 9-13 MODELS H664,H665 Alignment PILOT RADIO CO.

PILOT RECEIVERS OF TILE H-550 SERIES.

SERVICE DATA

Removal of the chassis from the cabinet, when necessary, is done as follows:.

1. Remove the poser supply cord tram the supply outlet. 2. Remove the knobs and felt washers from all shafts on

the front of the cabinet. These ]mobs are of the "push -on" type.

3. Remove the speaker cord from the socket on the speaker. 4. $cove the four mounting screws located under the cab-

inet and carefully slide the chassis out of the cabinet.

deceiver Alignment Equipment Required. 1. Signal denerator. One using fundamental frequencies

for all the frequencies ueed in the receiver is preferred.

2. Output Meter. Generally a copper oxide rectifier

meter is the moat convenient. 3. Dummy Antennas. .1 mfd. condenser

.0002 mfd mica condenser 400 ohm, non -inductive resistor

Aliment Connections There are three wires with.connectora

m the ends, extending from the chassis to the rear of the cabinet. Their colors and uses are:

Blue Antenna Yellow Doublet Connector Black Ground

Connect the black and yellow wires together and to the ground post of the signal generator.

Connect the "hot" post of the generator through the correct dummy antenna or condenser to the appropriate point se noted hereafter.

In all the measurements to follow, the output meter should be connected to the -.late and screen grid terminals of the 8F6-0 tube, through .1 mfd condensers, in any convenient manner.

Procedure The volume and tone controls Should all be turned to the extreme clockwise positions, before starting.

The location of all trimmers is ahem in the ac- cmpaning figure. Always keep the output fron tho signal generator at the lowest value which will give a readable deflection on the output meter.

IF Amplifier Alignment Turn the Band Selector Switch to Bend S and turn the receiver dial pointer to the low frequency end.

Connect the output meter as described under "Con rections", and connect the "hot" post of the signal generator to the grid of the 6K8 tube through the .1 mfd condenser. Then proceed with the alignment as follows: -

1. Adjust the signal generator frequency to 455 kilocycles, and adjust the generator output to the lowest value which will give a readable signal on the output meter.

2. Adjust the screws 1, 2, 3, and 4 (see figure), for maximum reading of output meter. Keep reducing the output fron the generator if the output meter reading increases too much.

If the output of the generator to the receiver is too great, the alignment of the receiver will not be correct, se the AVC action will became too great, and the amplifier will appear broad in tuning.

It will seldom, if ever, be found necessary to more than touch up the alignment of the IF amplifier. Of course, if the amplifier adjustment screws have been tampered with, if the amplifier adjustment serene have been tampered with, it will probably be necessary to completely realign the amplifier. In this case, connect the generator to the grid of the IF amplifier tube, and align the last IF transformer. Always finish the alignment with the signal input to the 6K8 tube.

A cathode ray oscilloscope is not necessary in making the above adjustments. Case may be used, however, if desired. Wave Trap Alignment With the Band Selector Switch set an the Broadcast Bendreplace the .1 mfd dummy antenna with the .0002 mfd dummy antenna. Set the generator frequency at 455 ko and time trimmer #11 for minimum reading of the output meter. There must be sufficient output from the signal generator to always have a reading on the output meter, do not allow the meter go to zero and call that the correct adjustment point.

R.F. Alignment

Band 3 (Model 555 Long -Rave) Connect the "hot" terminal of the generator to the blue wire and clip through the .0002 mfd condenser.

Set the generator frequency to 300 ke., and with the Band Selector Switch set to Band 3, turn the receiver dial pointer to 300 ko. Adjust trimmer #5 for maximum reading of the output meter. Do likewise with trimmer #13. Then set the generator frequency to 175 kc and the receiver dial pointer to approximately the same. Adjust trimmer #6 for maximum reading of the output meter, while "rocking" the gang condenser carefully back and forth. Then go back and repeat the 300 ko alignment.

Bead 2 (Model 555) Bend 3 (Model 554) (Standard Broadcast) Connections are the same for the alignment of

thie band as they are for the long -wave band. Set the generator frequency to 1500 kc., and the

receiver dial pointer to the same frequency, with the Land selector switch set appropriately. Adjust trimmer #7 for maximum reeding of the output meter, (This trimmer is adjusted by moving the brass rod in or out, with a hooked wire, and with

MODELS H55.4H555 Voltage,Al.ignment

a twisting motion. First loosen the lock nut). Then without

touching any tuning controls adjust trimmer #12 for maximum read-

ing of the output meter. Next, set the generator frequency to 600 kc., end

accurately set the receiver dial pointer to the 600 kt. mark. Then adjust trimmer #15 for maximum rending of the output meter. Do not move the tuning control while making this adjustment. Finally return and repeat the 1500 kt. adjustments and then tighten the lock nut on truer #7.

Band 1 (Model 555 Short -Wave) Remove the .0002 mfd dummy antenna used in align-

ing the lower frequency bands and substitute the 400 oies resist-

or. Before aligning this band refer to the paragraph

headed "Image Frequency". Set the generator frequency to 18 mc. and also set

the receiver dial pointer to this frequency. Carefully adjust trimmer #8 for maximum reading of the output meter, be careful you do not tune in at the Image Frequency.

Then adjust trimmer #14 for maximum output meter reading, wile slightly "rocking" the gang condenser. Readjust trimmer #8 if necessary to keep the calibration correct. These

are the only adjustments on this band.

Band 2 (Model 554 Short -Wave).) Connections and dummy antenna same as on Bend 1

above. Before aligning this band refer to the paragraph

heading "Image Frequency". Set the generator, and the receiver dial pointer

to 9 me. Adjust trimmer #9 for maximum reading of the output meter, be careful you do not tune in at the Image Frequency.

Then adjust trimmer #13 for maximum reading of the

output meter, while slightly "rocking" the gang condenser. Re-

adjust trimmer #9 if necessary to correct the calibration.

Band 1 Alignment (Model 554 Short -Wave) Connections and dummy antenna are the same as an

Band 2 of model 554. Before aligning this band, refer to the paragraph

headed "Image Frequency". Set the generator frequency to 24 me. and the

receiver dial pointer to 24 me. Adjust trimmer #10 to 24 me. for maximum reading of the output meter. Be careful that the receiver is not adjusted to the Image Frequency. Then adjust trimmer #14 while "rocking" the gang condenser, for maxim.m

reading of the output meter. Reset trimmer #10 so that calibration is correct if necessary,

/:age Frequency All bands in these tee models muet be aligned with

the oscillator frequency higher than the signal frequency. There can be no error in doing this on the Long -Wave and Broadcast Bands. However, on the higher frequency bande it is possible to incorrectly adjust the alignment in this respect, end end up with the receiver aligned on whet should be tho Image Frequency.

The chances of doing this may be eliminated by adjusting the generator to the correct aligning frequency, and with sufficient output from the generator to pick up two signala with the receiver, separated by twice the Intermediate frequency, set the receiver dial pointer to that one which comes in at the higher frequency marking on the receiver dial pointer.

D.C. SOCKET VOLTAGES

All voltages are those between the indicated tube terminal and

the chassis, and are made with a 1000 ohm per volt voltmeter.

Make measurements with no signal input to the receiver and with

the volume control set at minimum volume.

'lake sure that the A.C. supply voltage is correct for the trans-

former tap being used at the time of measurement.

Socket Terminals

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Miscellaneous Service Notes If a howling noise (sometimes referred to sa Micro -

phonic howl) is heard, it is very probably because the four red

screws under the cabinet have not been removed, along with the

two narrow metal strips between the chassis and the bottom of

the cabinet. These strips end screws are only intended as add.

itional bracing during shipment and must be removed before the

receiver ie put in operation. The howl can also be caused by a defective tube,

or when some part of the receiver which is rigidly fastened to

the chassis rubs against the cabinet. The remedy is obvious.



14 PILOT

NDDELS 11594,11597 Voltage,Alignment PILO'l' RAI)IU CO.

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16 l'II,O'r MODELS H594,H597 Socket,Triruaers

Specifications PILOT' 1-L I)IO CO.

PILOT RADIO CORPORATION I ,N, iSi Awn C irv N Y U S A

TRIMMFT' LAYOUT

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PILOT PAGE 9-17

'7) o c.. .7

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PILOT RADIO CO.

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MODELS H664,I1665 Soheaatio ,Par ts

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l'AGE 9-18 PILOT

MODELS H664,H665 S ocket, Tr inmiers Voltage,Specs.

PILOT RAllIO CO.

D.C. SOCBET VOLTAGES

All voltages are those between the indicated tube .terminal and the chassis, and are made with a 1000 ohm per volt voltmeter. Make measurements with no signal input to the receiver and with the volume control set at minimum volume.

Make sure that the A.C. supply voltage is correct for the transformer tap being used at the time of measurement.

SOCEET TERMINALS

Tube 1 2 3 4 5 6 7 8

688 - - 240 95 - 110 - 2.8 687 - - 240 95 3.3 - - 3.3 6Q7 - - 105* 1.4 6F6 -G - - 225 245 - - - 16 5t3 -G - - - - - - 340 340

*Not true voltage but as measured with voltmeter

2 "./. F. 1ST' 1.p.

FOR ALIGN- NT e W SEE INDEX

0

ti

o

AD. AT 455 K.0

ADJ. AT 600K .0

VIEW OF CHA55/5

O o

ti

TRIMMER LAYOUT

o...... etv

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0...6 -24 -Tg -

27'2.5/ 9l

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MODEL HF -1 Schematic Fidelity Switch Data

E

.:y cm

W _ E 7

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= O V u9 ; C3 >(5

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= O o

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Li

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= K LAI x 0 tz' ú

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= E « %,:-.

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z z z z z zó

j'AGE 9-2 RCA

IE EL EF-1 Sooket,f imera, Voltage ChL3sis W ring,SpeosNotee

Frequency Range 540-1,550 kc 2 Stations between approx. 540.1,160 kc (buttons 7 and 8) 3 Stations between approx. 630-1,230 kc (buttons 4, 5, and 6) 3 Stations between approx. 780-1,550 kc (buttons 1, 2, and 3) Intermediate Frequency 455 kc A socket is provided for an RCA -605 or 6G5 "Magic Eye" Tun- ing Tube, to lacilitate adjustments for electric tuning.

Pilot Lamp Mazda No. 46, 6.3 volts, 0.25 amps. I 'oWER SUPPLY RATINGS Rating A 105-125 volts, 50-60 cycles, 115 watts Rating B 105-125 volts, 25-60 cycles, 115 watts POWER OUTPUT Undistorted 10 watts Maximum 12 watts LOUDSPEAKER Type 12 -inch Electrodynamic Impedance (v.c.) 2.25 ohms at 400 cycles

360:

514 RECTIFIER

CATHODE CURRENTS (u 6A8..-_. _-._122 M A. 121 6NT..._...

_ _-.5.6 M.A (31 EAT 0.63 MA Si 615 ...... .. _ 0.95M .A. UI 615 ..- 495M A.

360V 161 Ara .. 256MÁ AG 01 6E6 25Á M A

66 ST4 .07.5M f.AN NOT 6E MEASURED ll T SOCKET

6F6 OUTPUT

zazo- ,

35TV ---

L3qpy.J

6E6 OUTPUT

I^nv') 0.6V.

AC ere _ F2f V.1

6.Ae

RCA MFG. CO., INC.

1i6V )1r -say `-

se -

6A8 YT DET, OSC.

Precautionary Lead Dress and Replacement of Parts

1. The green lead from the antenna coil to the switch, and the green lead from the link coil to the switch, should be dressed away from the oscillator coils, and free of other leads, chassis, and parts.

2. When replacing a dual trimmer, it must be installed so that the top plate (to which the adjustment screws make contact) is the ground side. This is particularly important on C39 -C40, and C47 -C48, because the sections of these trimmers are of different capacity range and must be correctly oriented in the receiver. Grounding the top plate takes care of this.

3. Maintain color coding on output transformer (T2) as shown in the schematic diagram. This is necessary in order to obtain correct inverse -feedback action.

1ÁT I. F TRANS.

240 V

ASK

o.av.- SOCKET cot

TUus JINGoRs TUgi

RaV- AC.

6J5 PHASE INVERTER 18001 (60110

DRIVER 766V fibs

6J5 -- 3370 DRIVER

O Ile Go.

F?tV1 OV

BOTTOM VIEW -REAR OF CHASSIS

Figure 5-Radiotron Socket Voltages B Note: Values wjth star (A) are operating voltages.

Values not starred are actual measured voltages. Measurements made to chassis unless otherwise indicated and with Magic Eye in socket. Measurements made with all push buttons out, volume control

VOLUME CONTROL

R 1

RS

STN ,RECT.

T1

'ELECT. CAPACITORS HEI

© RCA MOO. CO.INC. T-TO92J-O

POWER SWITCH

TO ANT (A) TERM. ZERO

BLUE

*2Y

L4 --PM. ADJ.

4551(.C.

--Rtl ADJ. ASS N.C.

1"4 I.F. TRANS.

G.G. ,1 FV9

6K7 1759- -- ).F

-SK 93V_ ` --240V

-838 3M I.F TRANS.

(Ass.)

._EIV.V)

leT 6RT 2 DET.,

A.F. 6 A.V.C.

L12

455K.C.

turned to minimum, using 1,000 -ohm -per -volt meter, having ranges of 10, 50, 250, and 500 volts. (Use range above the specified measured voltage.)

Values should hold within approximately ± 20% for 117 -volt, 60 -cycle supply.

CATHODE RAY OSCILLOGRAPNI VERTICAL - HI - TO THIS TERM. CONNECTIONS VERTICAL 'O -TO CHASSIS.

,--STATION SELECTOR SWITCH - SIO 521 S22 521 S24 SOS 526 SET -T\''1 /1.1s))t{-Af1-,./71=1%-=16,e .s, s1T,

Witt.

519; ORGI . SS I ' rSA -rii t56 ?S7 ni ' as

A6 B 1 i,_1j II' l'li el:l I I- BRIO

LtNNCIRCUIT-- rf- 1

TRIMMERS

111 H E II

r4 M T ANTENNARIMMERS - --

N

8 T I IV - ro- os LILL ATOR

WCOILS äl

ANT. COIL U 4$.

L2

MOUNTING BRACKET -

L1

6F6 --

OUTPUT

Ò-Z7>

1

L2

O,R1

(TúIEuU

LC2I

R24

C19

R26

LINK COIL

®® îr_

6F61 OUTPUT

RI9'R26 R0I R21 Ilse I',ILL._

BOTTOM VIEW- REAR OF CHASSIS

TO

Is

e

GR[CN R

¡On

GREEN

C>

KO COKiLECTIOK

eses R2G

13

YELLOW FIDELITY - SWITCH

SI -S2

SLACK --

6

BLUE mAcs--

CO'

-GREEN- MOUNTING BRACKET

Lt]

aLACK 0+1050. JACK

SOCKET Ieof 1t® FOR SUS ® OR 665 TUNING T

TERM BRO. RI1 -t

® Je © U ® 14 RIO

6J5 ( 9

R6

PHASE INVERTER i DRIVER

C2T

CLLOW

OSC. OIL

ELECT. CAP RIT

Figure 3-Component Parts Location and R -F Wiring Diagram

IATDET. i OSC.

GO 62.8

R

PT I.F TRANS.

ELBE PLACK 2991.F. TRANS.

AJPTe LB

O Q YAM

YELLOW

399 I.F TRANS.

CI.

e© ©4 7 c16

6 KT

CSO

1.F.

Soliti

HAWN

L12 HMII. AO.1

455 KC

6.15 6R7 DRIVER 2RR' OET.A.F,1A.vC.



RCA PAGE 9-3

RCA MFG.

l -F Alignment Procedure Cathode-ray Alignment is the recommended method for Model

HF1. Connections for !lie oscillograph are shown in the chassis

drawing. Output Meter Alignment.-If an output meter is used, connect it

across the voice coil, and turn the receiver volume control to maximum.

Teat-oscillator.-For all alignment operations connect the low side of the test -oscillator to the receiver chassis, and keep the output as

low as possible to avoid a -v -c action. For additional details, refer to booklet "RCA Victor Receiver

Alignment". Push in button 8, and adjust the No. 8 trimmers and core to a

quiet point near 600 kc. Leave the button pushed in for the following operations:

EDEL EF-1 CO., INC. Alignment

Parts, Tuner Adjustments for Electric Tuning

i. Make a list of the desired eight stations, arranged in order from high to low frequencies. It is preferable to select strong local high -quality stations within a radius of 100 miles.

2. Insert an RCA -61J5 or 6G5 Magic Eye tube in the six -prong socket on the chassis. Use an insulated screwdriver or alignment tool (such as RCA Stock No. 31031) for all adjustments. LEAVE THE FIDELITY SWITCH IN POSITION 3 OR 4 WHILE MAKING ADJUSTMENTS FOR ELECTRIC TUNING.

3. Remove the antenna lead-in from the "A" terminal and wrap it once around the green lead to the top cap of the 6A8 tube. (This provides capacity coupling between the antenna and the 6A8 grid.)

4. Push in button No. 1 and turn oscillator core No. 1 to bring in the first station on the list. Adjust the core carefully for peak

output as indicated by the Magic ye. Adjust link trimmer No. 1

for max. output. 5. Remove the antenna lead-in from the 6A8 grid lead and con -

Connect thenect Tune djust

thep followingann the lead-in to the "A" terminal. Adjust antenna trimmer No,

rid link trimmer No. 1 for peak output as indicated by the Magic

Steps high side of

test-osC Turn Fidelity switch to-for e Eye. to the test -oscillator to- to- symmetry- (Clockwise rotation of cores and trimmers tunes circuits

lower frequencies, and counter -clockwise adjustment tunes the cir-

No. 1 6K7 I -F grid cap, in series

with .001 mfd,

455 kc (20 kc sweep)

- - - - L12 and L13 (3rd I -F transf.)

(Refer to curve "A")

cuita to higher frequencies.) 6. Push in button No. 2. Adjust oscillator core No. 2, antenna

trimmer No. 2. and link trimmer No. 2 for the second station in the same manner.

7. Follow the same procedure for the remaining stations.

No. 2 6A8 1st-det. grid cap, in series with

455 kc (20 kc sweep)

Position 4 (from left)

Turn L4 and L5 (1st I -F) out as far as possible. Peak LB and L9

8. After tuning in eight stations as specified above, leave the antenna lead-in connected to the "A" terminal, and carefully re - adjust each of the oscillator cores for peak output on the respective

.001 mid. (2nd I -F), and then L5 and L4. Readjust

stations. 9. After the set is installed and connected to the customer's an -

L8 and L9 slightly if necessary.

teina, make a final readjustment of the antenna and link trimmers. 10. The Magic Eye should be removed from the chassis after

(Refer to curve "B") completion of the electric -tuning adjustments.

No. S Turn selectivity switch to position 5. Response should be like curve t i \v RETURN

RACE

No. 4 Turn selectivity switch to position 6 (full clockwise). Response should be like curve "D".

i \ _A No. 5 Follow "Adjustments for Electric Tuning". The No. 6 position (knob turned full clockwise) on the fidelity Curve "A" Curve "B" Curve "C' Curve "D"

switch provides minimum selectivity and maximum fidelity. This Input to I -F Input to 1st- Input to Ise- Input to 1st - position of the switch may be used tor tun -range reproduction of the grid. det. grid, det. grid, det. grid, majority of local stations, but occasionally (due to the present 10 fidelity switch fidelity switch fidelity switch kc station spacing), an adjacent channel signal will cause a 10 kc at position at position at position beat or "monkey chatter." Turning back the fidelity switch to pad- 4 (from left). 5 (from left). 6 (full clock - ion 5, 4 or 3 will eliminate this condition, at the expense of high- wise).

"monkey is fidelity reproduction. (An example of possible chatter" Figure 1-A rO.ritnnf¢ I -F Res Ons¢ Curvesfound in the case of WOR at 710 kc. and WLW at 700 kc.) 9 pp p

STOCK No. DESCRIPTION

Unit List PricePrice STOCK No.DESCRIPTION

Unit List

RECEIVER ASSEMBLIES 13730 12013

Resistor -1 meg., I watt (R18) Resistor -1 meg., 1'10 watt (R7)

.20

.15

13216 Board-Antenna and ground terminal board... .25 31056 Resistor -1.2 meg., 1,10 watt (R9) .15

30314 Cap-Grid contact cap .09 12679 Resistor -2.2 meg., I watt (R17) .20

12581 Cap cap for first or third I.F. trans- 13601 Resistor -10 meg., * watt (R24) .20 -Shield formers .25 12007 Spring-Retaining spring for core Stock Nos.

12607 Cap-Shield cap for second I.F. transformers .20 12006 :md 30846 .15

30750 Capacitor-Adjustable dual trimmer 30-180 12110 Shield-Radiotron shield cap .14

Mmfd. (C41, C42, C49, C50) .45 14278 Socket-Phonograph socket .25 31066 Capacitor-Adjustable dual trimmer 30-180 14171 Socket-Pilot lamp socket .40

Mmfd. and 65-280 Mmfd. (C39, C40, C47, 4786 Socket-Adjustment eye socket .25 C48) .45 11196 Socket-Radiotron socket (B -contact) .25

30764 Capacitor-Adjustable dual trimmer 65-280 Mmfd. (C37, C38, C45, C48) .45

31(81 S St h-Selectivity and tone control switch (S1, .95

30765 Capacitor-Adjustable dual trimmer 120-470 31070 Switch-Staticn selector and on -off switch-less Mmfd. (C35, C36, C43, C44) .50 push buttons (S3, S4, S5, S6, S7, SB, S9,

30769 Capacitor -105 Mmfd. (C26) .40 510, S11, S12, S13, S14, S15, S16, S17,

30904 Capacitor -105 Mmfd. (C11) .25 S18, S19, S20, S21, S22, S23, S24, S25,

12404 Capacitor -120 Mmfd. (C4, CO, C6. C8, CO, 526, S27) 4.60

C10) .30 31063 Transformer-First I.F. transformer (L4, L5, 13003 Capacitor -180 Mmfd. (C3) .25 L6, L7, C5, C4) 2.25

12952 Capacitor -330 Mmfd. (C16) .25 31064 Transformer-Second T.F. transformer (LB, L9, 5107 Capacitor-.0025 Mfd. (C17, C20) .20 L10, L11, Co, CB) 2.25

4838 Capacitor-.005 Mfd. (C1S) .25 31065 Transformer-Third I.F. transformer (L12, 14393 Capacitor-.01 MEd. (C12, C14, C15, C22) .30 L13, C9, C10, Cll. R3, R4) 2.50

11315 Capacitor-.015 Mfd. (C7) .20 31062 Transformer-Output transformer (T2) 2.30

4886 Capacitor-.05 Mfd. (C1) .20 11211 Transformer-Power transformer 105-120 volts. 4839 Capacitor -0.1 Mfd. (C2, C21, C27, C30) .30 50-60 cycle l T1) 8.00

12484 Capacitor -0.25 Mfd. (C18, C19, C2B, C29).. .30 11212 Transformer-Power transformer 105-120 volts, 30105 Capacitor -16 Mfd. (C25) 1.55 25-60 cycle (T1) 11.65

5212 Capacitor -16 Mfd. (C24) 1.95 31060 Volume Control (R8) 1.50

14531 Capacitor -25 Mfd. (C23) 1.55 31068 Coil-Link coil (LS) .60 REPRODUCER ASSEMBLIES 31069 Coil-Antenna coil (L1, L2) .85 (Speaker RL70E-4) 30749 Coil-Oscillator coil (L15, L16) .80 13866 Cap-Dust cap for center cone3.85 .03 30748 Coil-Oscillator coil (L17, L18, L19) .60 11234 pu Coil-FieldCoil-Neutralizingcoil (L25)coil 30747 Coil-Oscillator coil (L20, L21, L22-) .80 11469 (L26) .85 31067 Coil-Oscillator coil (L23, L24) .80 12667 Cone-Reproducer cone, voice coil, center sus - 5040 Connector -4 -contact female speaker connector .90 pension, and dust cap (L14) 1.95

30846

12006

Core-Adjustable core and stud for oscillatorcoils

Core-Adjustable core and stud for I.F. transformers

.30

15

5039 31072 14357

Plug -4 -contact male plug for reproducer Reproducer complete Washer-Spring washer to hold field coil securely

.30 10.35

.06

5226 Lamp-Pilot lamp .17 MISCELLANEOUS ASSEMBLIES 30865 Resistor-Voltage divider comprising one 1,500

ohm, one 2,100 ohm, one 2,900 ohm, two 31074 Button-Push button foe on -off switch .07 15 ohm, and one 165 ohm sections (R19, 30981 Button-Push button for station selector switch .10 R20, R21, R22, R23) 1.10 13103 Cap-Pilot lamp cap.....................i5

14284 Resistor -22,000 ohms, 1/10 watt (RS) .15 31095 Discs -10 celluloid protector discs for call -letter 12266 Resistor -39,000 ohms, } watt (R5) .20 markers . .10 12286 Resistor -56,000 ohms, * watt (R25) .20 31073 Escutcheon-Push button escutcheon .85 12719 Resistor -82,000 ohms, 1/10 watt (RI0) .15 14269 Knob-Volume control or selectivity and tone 14560 Resistor -100,000 ohms, } watt (R1, R2, R13, switch knob....

R15, R26) .20 31028 Marker-Station call letter markers for push 13698 Resistor -180,000 ohms, * watt (R6) .20 buttons .40 11398 Resistor -220,000 ohms, 1/10 watt (R4) .15 31048 Plus -2 -contact male plug for phono jack .15 12199 Resistor -270,000 ohms, } watt (R11, R12,

R14, R16) .20 14270 Spring-Retaining spring for knob Stock No

14269 .05

ALL PRICES ARE SUBJECT TO CHANGE OR WITHDRAWAL WITHOUT NOTICE.



j..WE 9-4 RCA MODELS HF-2,HF-451)130 Tuner Adjustments Specs.

RCA MFG. CO., INC.

Pilot Lamps: (4) 3-6.3 V., 0.25 POWER SUPPLY RATINGS (Model U -13(i) Rating A6 Rating A Rating B2 Rating C6 Rating C POWER SUPPLY RATINGS (Models HF -2 and HF -4) Rating A 105-125 volts, 50-60 cycles, 125 watts Rating B

Rating C

Amp. Mazda No. 44; 1-6.3 V., 0.15 Amp. Mazda No. 47

Radio Only Total 105.125 volts, 60 cycles, 125 watts 150 watts 105-125 volts, 50-60 cycles, 125 watts 150 watts 105-125 volts, 25 cycles, 125 watts 150 watts.

105.130/140.160/200.250 volts, 60 cycles, 125 watts 150 watts 105.130/140.160/200.250 volts, 50.60 cycles, 125 watts 150 watts

105-125 volts, 25- cycles, 125 100.130/140.160/195.250 volts,

cycles, 125

watts 50-60 watts

ADJUSTMENTS FOR ELECTRIC TUNING

POWER OUTPUT

Undistorted Maximum

vEAGIC_ YE

I I 3.

4.

RAnGE 5. 1NDICATOR

6.

IJ ,J

The

. aLOUD

DOW ER -VOLUME

rent. IL A mi

FIDELITY CONTROL CONTROL

Figure 1 -Location of Controls

)I

51T TUNING RANGE

SELECTOR

left-hand push-button is a Victrola-Attachment switch. The right-hand push-button is for dial tuning.

1. Make a list of the desired eight stations, arranged in order from low to high frequencies.

2. Turn range selector to "A" band, turn power on, and allow a few minutes for warming up.

10 watts 12 watts

Turn Fidelity Control maximum counter -clockwise.

Press down the "dial -tuning" (right-hand) button.

Manually tune in the first station on the list, using the "Magic Eye" for accurate tuning.

Hold down the "dial -tuning" button, and press down station button No. 1 (second from left). Both buttons will stay down, central dial lamp will light brightly or dully, depending on which side of disc, contact is. Move station -setting contact No. 1 to the insulating line on the disc at rear of gang. When the contact is correctly centered on the insulating line, the central dial lamp will go out.

'7. Press down any other button in order to release the dial -tuning button and station button No. 1. Then press down station button No. 1 again. The electric tuning mechanism will function to tune in the station, and the central dial lamp will stay on.

8. Repeat this process for the remaining stations.

nnnnmgmrlirnnnmgnnmipmmgnnlnnrnllnnnnlmqnnlnnpminnpminrqmimqmilnnmllnnnnmqmilmqnulnnpml

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170_ 180

err-,

19eee Mc

11(111 OIL LIMA PON 60 11 ACM IMO. M N 41/11111 NMMOSCOW

10180011 YIOC 101100 010111. 1.MI111 Noll 101000E M ON LONDON 1C M1 Y 01010111 - - . .

15.10 15.15 15.20 15.25 15.30 15.35 Mc

_

19

MC

MYNA 011110110. E11111.11 MY 1011° LONDON IN AGO. LONDON 11I11ICO 011 PAINS MAIM 100000 01 0 L01 N 0011011 IOI 1000 0401111 11111.11111.0411104N AM)

11.70 11.75 11.80 11.85 11.90 MC

5

A STANDARD BROADCAST roIKE

A 55 60 70 80 100 120 140 1601

31 MC

MNKO COY (O111110111 011800 MINI 1001°001 NONCOM CONTAGION 11.55A MADRID LONDON SCN0N'1 YNACIUI SIT'LD MALA N.A4 CI?! NOMI 0111001 AIMS - _ -31

9.50 9.55 9.60 9.65 C 4011101611 CITY AOAY 100001 (010.10 1010110 100000 001100 MINO Olt

MARAC AIDO VATICAN COY RNNO OIL 0NÚ1. N1100 OILL 1 10(460 (111(100 0 AMI N111'E t (111/1410 Lo L LA CELLA

49 MC 5.95 6.00 6.05 6.10 6.15 6.20 Mc

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180

Il tilüiilii liiiilliüliililülililiililiiliilillüilüI,Ilii,Ii iiIiittIllliIitiii,iiiIlüiIiiiiIiiuhüiIiiliillliIiiuIiIlililiillillltiilliilIliliilii,ililiilliülulilli1iI

Figure 2 -Reduced Reproduction of Receiver Dial, and Corresponding 0-180° Calibration Scales The corresponding position of the dial indicator for any setting Of the calibration scale can be determined by draw-

ing a line from this point on the bottom calibration scale to the same point on the top calibration scale. For example 90° on the calibration scale corresponds approximately to 11.8 me on the 25 -meter band, and 940 kc on "A" band, etc. Read instructions under "Alignment Procedure."



RCA PAGE 9-5

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RCA MFG. CO.. INC.

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YODELS HF-2,HF-4,1í130 Schematic

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6 RCA MODELS HF -2,F -F-4,11.30 Chassis Wiring,Voltage Transformar Data,Lead Dross

RCA MFG. CO.. INC.

Measurements made to chassis unless otherwise indicated, with set tuned to quiet point and volume control at minimum. Values should hold within approximately ±20% with 117 -volt a -c supply.

VVIYCIA NOVI!

140111).

'JOTS

RED TO POWER SUPPLY -SLACK REO- 10EDTR BLAC1

TOT.L. BLACK

040 RED ELLO

AEO YELLOW BLUE B EN ( TAPED) ELIOW

MOTOR- NOTE INNERT CON YELLOW- TwTER)AÑOD CONTACT BLACK - CORREEPONOINo t0 .LING POWER lUVPIY RATZ NGva

UNIVERSAL TRANS. CONNECTIONS

FGREEN - RECT FIL

GREEN DROWN -

FLEET .PLATE

SLACK BR OWN

BROWN- BLO E - MP GIL

Above - Universal Power Transformer Connections. (110 -volt supply for a Vic - trola Attachment may be obtained by connecting the motor to the red and the red - black leads.)

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HF -2, HF -4, U-130 www.americanradiohistory.com

RCA PAGE 9-7

IOU DSPEA KER

Type

RCA MFG. CO., INC.

12 -inch Electrodynamic Voice Coil Impedance 2.2 ohms at 400 cycles :

arc AD,. DETECTOR

488 KC. A'C

ANT. C4 R000KC

OCT CIO Oa08NC

05C. C311 1500110

ANT. C3 ISOON C

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CC.

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OUTFUT`1®

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A3 AEAIG I

1,

A07. 488 KC API 45.5KC

CAUT IOW THIS ADJ. SCREW MUST PROJECT AT LEAST 3/4` FROM TOP OF CHASSIS TO PREVENT SHORTING +B.

Figure 3-Tube and Trimmer Locations

, INOICRTOFA oRwC CORO.3aJy PIJLL& V 3I26Ó

SPRING 13036

TUR1LLCvNING K 312'11

JII

3 TUONS

ISN 870 (TUNING CONDENSK IN PILL meeA POSIT

LJNI

MODELS HF-2,HF-4,13130 Socket,Trimmers,Tuner Dial Drive Data,Notes

Loudspeaker.-Centering of the loudspeaker is made in the usual manner with three narrow celluloid or paper feelers after first removing the front dust cover. This may be removed by softening its cement with a light application of acetone, using care not to allow the acetone to flow into the air gap. A dust cover should be cemented in place upon corn, pletion of adjustment.

NOTE: Due to inverse feedback used on these models, it is very important to connect speaker, speaker cable, and feedback cable, exactly a3 shown in the schematic diagram.

Victrola Attachment.- A jack located near the "Magic Eye" tube is provided for connecting a Victrola Attachment into the audio -amplifying circuit. The cable running from the Victrola' Attachment should be terminated in a Stock No. 31048 plug to fit the jack. PHONOGRAPH (Model U-130 only) Type Automatic Record Capacity Eight 10 -inch, or Seven 12 -inch Turntable Speed 78 r.p.m. (Adjustable) Type Pickup Crystal Pickup Impedance 80,000 ohms at 1,000 cycles

Lllß IAEIIEII

O 80DY

73P1R 230

ff/NAI

FIERE BODY TIP VAIOLO 31221 31232E

WINI ESN

3N-aaa

Figure 6-(Above) Component Parts of Station -Setting Contact

INDICATOR DRIVE CORD 31201

TUNING kNDe SHAFT PULLEY 31271

3N -sas 3 TURNS

SPRING 31275

ON DENSER DRUM DRIVE

CORD 91283 N FRONT GROOVE

OF DRUM) ,,,,. TUNING CONDENSER IN FULL MESH POSITION)

Models HF -4, U-130 Model HF -2

Figure 9-Drive Cord Arrangement for Tuning Condenser, Dial Indicator, and Band Switch

This illustration shows connections for a G8A Armchair Control Unit. This unit is not supplied with the receiver but may be added as

an accessory.

Color of Lead Station To Station -Setting Button Contact No. 1 Black No. 2 Brown No. 3 Blue No. 4 Green No. 5 Red No. 6 Red -black No. 7 Brown -black No. 8 Red -yellow

STATION - SETTING CONTACTS

SBELÉCTÓR `.F,'-`1- ¢,'1 DISC

S

INSULATION LINE

Figure 7-Station-Setting Contacts and Selector Disc

Lubrication

Motor bearings and gear bearings; use light machine oil.

Gar faces; use "Pure Oil No. 611" or petroleum jelly. Dial -indicator pulleys and rails; use "Castordag" or petro-

leum jelly.

CONTACT

31231 0

INDICATOR - 31277 STAID

CORD 31276

BAND -SWITCH SHAFT PULLEY 31272

SAND INDICATOR DRIVE CORD

ARMCHAIR CONTROL

UNIT

SOLDER TO STATION - SETTING CONTACTS

Selector disc; apply thin film of petroleum jelly.

Friction leather on flywheel; apply "neats-foot" oil. When

replacing leather, soak it for at least 24 hours in neats-foot

oil, and insert in flywheel while dripping.



JAGE 9-8 RCA 14)DEIS HF -2,11F-4,0130 Alignment,Tuner Data Antenna

RCA MFG. CO., INC.

Steps Connect the high aide of estoeilhator to- Tune Test-

Oscillator to- Range

Selector Set Tuning Gang to-

AO. the following for mas peak output

TNo. 1 Tern Fidelity Control to Maaimtnm Cometerolockwise position.

No.9 1)R7 2nd I -F grid cap in aeries with .01 mfd 466 lest "A"

Point between L26, L27

(,- a .-F transformer)

Na II 6%7 se

Ut I -F grid cap in rfea with .01 mfd k. 466

"A Quiet Point

660-760 fie

L17, Lis (2nd I -F transformer)

4 Nan SAS he aerie. with p 456 kc "A" (1st I -F itraodorma)

6 AR in series with m 100 qL A3 to Chassis. 1,000 lest "A" 3,600 lee

(1613°) CIIO (me.)(me.)No.

COS (der)

No B AS. in aerie. with

100 mud. AII to Chassis 600 "A" SOO kc (30.0°) L26 Nu.)

No. 7 100 mmL AII to CiRuis 1,600 lee "A" 00 kc

(1616°) CM (ose.)

No. g AlAil

Connect to clsassis 6,100 kc "40M" 6,100 e

(106°) L24 (wc)

Nap Alt 9,600 kc "STY" 9,I00h L2S (osr.)e. ce cm.) C10 (der)

No. 10 AIL Connect Al toeLassis. 11,800k. "ffiY" 11200 kc °) L22 (0..)."

No. 11 Al Connect36,800 k. "1816" kc (7000°) Lai (ono)"

Use maximum inductance peak (plunger be if two peaks can be obtained. e Use tmnimum inductance peak (plunger out) H two peak. can be obtained.

Note that oscillator tracks above signal frequency on al bands except "49M" where it tracks below.

üthod.R.y Alignment is the preferable method. Conn«. sione for the oscdlograph are shown in the chased drawing.

Output Meter Alignment-If this method ie used, connect she meter across the voice coil, and turn the receiver volume control to maximum.

TastOdcillaor.-For all alignment operation, connect the low side of the testodtllator to the receiver thiada, and keep the output as low a possible to avoid avc action.

Calibration Sole on Indiraeae-DtivnCod Drum-The tun. ing dial ú fastened in the cabinet and canna be used for ref erence during alignment therefore a calibration scale is at. tacked to the rear of the indicatordrivecord drum which ill mounted on the front shaft of the gang condenser. The set. tingg of the gang condenser is read on this scale, which e calibrated in degree*. The correct setting of the gang in de. greet for each alignment frequency, is given in ehe align. meet able.

As the first step in rf alignment, check the position of the drum. The 'b" mark on the drum scale must be vertical, and directly over the center of the gangcondeneer shaft when the plates are fully meshed. The drum is held to the shaft by means of two set screws, which must be tightened securely when the drum is in the correct poston.

To determine the corresponding frequency for any Betting of the calibration scales, refer to the accompanying drawing which shows the dial with L 180° calibration dales drawn at top and bottom.

Pointe foe Cah'beatioss Soule.-Improvise a pointer for the calibration dale by fastening a piece of wire to the gang. condenser lame, and bend the wire w that it points to the "0" mark on the calibration dale when the pates are fully meshed.

Dca latte Adjustment ent-Afar fastening the chassis in the cabinet, attach the dial indicator to the drive cable with indicator at the 530 lest mark, and gang condenser fully meshed. The indicator has a spring clip for attachment to the cable.

Spread -Band Alignmee most dtie(actory method of aligning or checking the epreadband rang« ú on actual reception of short-wave nations of known frequency, by adjusting the magnetite -core oscillator coil for each band so that the« stations come in at the correct points on the dial.

In exceptional case., when the set it being divined in a

location where then node level is high enough to prevent reception of short-wave station., a lator may be used for alignment, but an extremely highgh degree of accuracy ie required in the frequency «dings of the temoscillator, as slight error will produce considerable inaccuracy on the spread -band dials. The frequency se of ttings the tesPoecillator

methods: be checked by one or both of the following methods: I. Determine the exact dial semngs of the rest ator

(for frequencies at or clod to the specified alignment frequencies) by serog the test -oscillator against h ve lotions of known frequency.

2. Usese harmonica of the eandard. roadcad range of a

this ranllstor, first checking the frequency tongs on this range by means of a crystal calibrator (RCA Stock No. 9572), or by aermbeating aganet standardstandardbroad,

Whenr stations.

a red oscillator is employed for spread -band alignment, a final check should be made on actual reception of shortwave nations of known frequency, and the magnetite -

core amillamr coil for each band should be r-djused se

that the Nation. come at the erect point* the disc For additional information, r. fer to booklet "RCA Victor

Receiver Alignment' Using RCA Stock No. 170 Ts Oddl.ter,-When wing

this oscillator for spreadbard alignment, insert an open -

circuit 't plug in the "EXT. MOD. jack, and set the teen oscillator dial 800 kc lower than the desired frequency for the four lower frequency rangea, and 800 kc higher than the desired frequency for the two high ranges. This provides an n oduared signal of the desired frequency and the MagiciEye may be used as an output indicator for thm un modulated signal.

Armchair Control Unit

When a Model GOA Armchair Control is connected to the receiver N shown in figure 7 it duplicates 'the action of the push-button on the front panel when No. 1 button is

pressed down. The black lead from posh.button No. I is

unsoldered from No. I wtion-fitting contact and soldered

to a terminal board which is to be 'mounted on the frame of rejector mechanism. In one

e of the other n

sanon buttons on some

the ate be used place of No.I button for the operation of the Armchair Control.

This arrangement allows the use of only seven of the

eight button. when tuning in wtion at the set, but allows the use of she entire eight buttons on the Model GOA Arm- chair Control. In operating the G8A Armchair Control the

puhbunon must be held down until the station has been

tuned in. Care must be taken not to hold two of the wtion buttons down at one time as both winding. of the motor may be engaged simultaneously causing the motor to be in onentive and overheated.

LUBRICATE GEARS WITH PETROLEUM JELLY. USE LIGHT MACHINE OIL ON GEAR KARINGS

DRIVE GEAR MOUNTING SUPPORT AND STUD ASSEMBLY, 3123G

DRIVE GEAR CLUTCH AND PINION GEAR 91297 Stj/so CYCLES) 51644 25 CYCLES)

Antenna Connections RCA Victor Master Antes KM-Connect the twisted

pair tranemúelon line ro terminals Al and A2 on the terminal hoard at rear of chaule. Connect the caunterpoise to Al. Terminal G may be connected to ground, but this connection is not necessary for correct °pennote.

NodeRduting Adjustment-After the RCA Victor Mae.' ter Antenna Kit is connected to the receiver, tune the re ceiver to a point near 900 kc where no station is heard. Turn volume control clockwise until noise is heard.. If no noise of a regular character ie audible, start any bruhrype motor- driven appliance, such as a vacuum cleaner, electric naor, refrigerator, ex., but do not bring it too near the rer. This will generate noise as communal. tinun caflkling, orbumbu Adjust CI to a poin where this noise in reduced to a mini. MUM.

Adjumment of the noise reducing trimmer CI should be made in the customer's home, with the RCA Victor Mauer

Antenna connected to the receiver.

This adjustment is effective 'only when the RCA Victor Master Antenna is lased. For all other types of antenna, the nurse -adjustment trimmer Mould be Dewed all the may down.

Other Anrennm.-Use terminals Al and A3 on the rc ceiver terminal board as antenna and ground connecung point. respectively. Terminal A3 may be connected to terminal G, unless this causes interference, in which cad this connection should be omitted.

GEAR -MESH ADJUSTMENT STUDS (SET FOR MINIMUM B ACK -LASH ANO FREEDOM FROM BINDING BY ROTATING STUDS)

KNOB SHAFT

KNOB SHAFT

--:677 PULLEY. 91271

CONDENSER DRUM ..../DRIVE cono, 91269

.'

MOTOR MOUNTING SUPPORT ANO STUDS 91244 (scrGo evcL 9)I H 91245 2 CYCLES 314139 60 CYC LEB))))) U-'3e

ROTOR SPRING USED OR NF -2, HF -4 ONLY

a MOTOR I31293(SCyIGO CYCLES) Lo 124G(26 CYCLES)

ROTOR la FILLED FORWARD WHEN MOTOR es ENERGIZED AND THE ENGAGING ARM ENGAGES WITH CLUTCH.

FLYWHEEL 31240

NEARING ARM

I "WASHERS

MOTOR SHAFT ANO PINION SHAFT MUST SE IN LINE

KNOB -SHAFT DRIVE GEAR /AND HUB, 31236 INTERMEDIATE DRIVE GEAR AND PINION 31296 50/GO CYCLES) 31545 2 CYCLES)

L.I I LAY

[email protected].:3,4.: !.'1 : f fi gR

.

I/¡ wF

.y 71Kk. ,`".,{

FRICTION ADJUSTING SCREW SEAL WITH HOUSEHOLD

CEMENT.

det

31491 BRACKET MODEL U-130 ONLY

3 VERTICAT L DOSITIOREW f ((ORIV[éND UPWARD UNTIL THE ROTOR

UPT SCREW f5 TURNA UPWARD

DNO3 LOCK I N PLACE WITH NUT.

LUBRICATE KNOB SHAFT KARIPSS WITH PETROLEUM JELLY

USE LIGHT MACHINE OIL AT MOTOR BEARINSS

"C" BYAMMER WASHER

SPRING 31404 (25 CYCLES) 31493 coo CYCLE$) MODEL U-130 ONLY

Figure 8-Motor and Gear Mechanism

There mum be I/32.inch clearance b tty n the end of the engaging arm-and he face

kf the intermediate fear when tho is s fowad position

Electric Tuning Mechanism

The circuit of the electric tuning mechanism is shown in

the schematic diagram, and the mechanical details are illuv tasted bellow.

The action can be understood by following a cycle of operation:

When a station button is pushed in. it completes the 24 volt circuit through the corresponding sationrning contact and one.half of the brass selector dix, which is connected

n

to one side of the motor field coil. This energise. the motor, and the rotor is pulled forward. engaging with the gear

train that drives the tuning condenser and selector disc. The condenser and disc rotate until the insulation line come. under the particular stationuetung contact. and the motor circuit is broken. Inertia

r

s the insulation line peat the

station -setting contact which then makes contact to the other half of she disc: This completes the circuit to the other aide

of the motor field cod, causing the motor to reverse. Thy floating flywheel is still turning in the original direction and

therefore dims down she re venal movement of the motor; as a result the selector did is moved slowly back until the

insulation line is under the sationrtting contact, when the

circuit is broken and the mechanism stops.

Adjustment of Flywheel Friction

In normal operation, the motor driva the tuning condenser and selector disc und the insulation line fuse pave. the particular sationsetting contact: The motor then recessee and moves the did slowly in the opposite direction until the

eneulamn hoe launder the contact and the mechanism stops.

In some cases, particularly tenth high line -voltage, the did may make two or three reversals before topping.

The flywheel friction adjustment drew should be set to give the

l st number of reversals with the chassis in normal

h

Adjustment of Selector Die

The brass selmior Mac s fastened to the rear shaft of the

n tuning condenser by m ( NM ensscrews. When the condenser is at maximum (plates fully meshed) the insola non line should be honsonW. with the operatingc d at the left (viewed from rear). The pen na -e d has dark insulating matenal and the bau is beveled t this end.

The selector disc should be set x that the conaccnp plungers in the station.dtting contacts project not more than 1/1tren. from the body of the m"tua.

Muting Circuit

When the electric tuning mechanism ie in action, the

motopeupply volage is fed into a diode rectifier circuit which

applies a high "bid to the IF finoaudio and second -audio

tubes. This pre enta audio amplification and makes the set

quiet or mute while ehe mechanism ie operating.



MODELS 910KG,U126 U128

Automatic Record Changer

géñ9lr211. éiE:nlerme=8a: éu 44Aé

5üC2ä$2

RCA PAGE 9-9

ZdODELS HF-2,EF-4,11130

MODELS HF-6,IiF-8, U132,U134



10 RCA MOnFLS HP -2,11F -4,1;130 Parts List RCA MFG. CO., INC.

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RCA PAGE 9-11



12 RCA MODEL 5U Chassis wiring Coils

RCA Mh'G. CO., INC.

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RCA PAGE 9-10 MODEL 513

RCA MFG. CO-., INC.

WHITE

R

SH I LD\ 36

o BLUE

LACK RED

PHONOG. VOLUME CONTROL

FIDEL.CONTROL SWITCH

1RSE

LUE

POJJER CORD

TUNING TUBE

0EB

FiMPLIFIER

ATD GONER I 5' PALM

SKI EL

YELLOW

R32 EMEG

ITE

BLUE

RFDIO-PHONO. SWI

Assembly Wiring

EMEO. FOR 50 ( DO -MOTOR I C74 54614 511488

BR GEEN I B -CK

1 -BLACK

BRAKE SWITCH

PILOT LAMP

MOTOR BOARD

RED REEN ELL.

RE CREE BLACK

OMPLTMENT

BROWN

S 14430

MOTOR MI

YELLOW TOGGLE SWITCH

s8 auk

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BLACK.

5441? s`46T+ INPUT TRANS. PACK BLACK

CONNECTIONS REEN RED ED Low

GAI. BLACK 104

SHIELD

5..1146e }YEL11T

5.4573 6150n F\\

SIILD HfLUé

SPEAKER

THE` S NUMBER RDJRCENT CABLES AND PLUGS INDICATES STOCK NUMBER nu_ CABLES COMPLETE WITH PLUGS UNLESS OTHERWISE NOTED ADJACENT C NUMBER

Figure 12-Assembly Wiring

COMPENSATOR PACK CONNECT IONS

32504 ` 5250k CCMIECT GREEN LEADS TOGETHER

RCK



14 RCA YODEL SU S ooket, Tr immer s

Piok-+up,Motor Details

Phono.Assembly Wiring

- - - - TO REMOVE TURNTABLE UTMO IT- LOOSER NUT, PUBN STOP UP OUT OP SLOT Mq ROTATE eo-

REMOVE BURRS FROM POLES OP STATOR APO ROTOR MYTH PME EMERY ELOTR

261e2,. PEO

IIO VOLTS-5OCYCLES I10VOLTS-25CYCLES

_UE YELLOW L. -SHIELD EXT.



RCA PAG E 9 15 MODEL 5U

RCA MFG. CO., INC. Voltage,Resistance Speaker Wiring

ELECT. CAP. C35

--376iL-

I,' -Oa--- 1

11¡ 1 I ,Ïa 4

l' v-0 474000.

OUTPUT 42

RR: RK RESISTOR "M Rwf R" T ASSEMBLY

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COIL

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r 165RPOWERATINGA6 iill OTNlR RATINSS 3RR fOIÇAMTIÇ OIAORAM

® RCA MIR. co., INC.

TONE CONTROL 4, POWER SWITCH

BOTTOM FRONT OF CHASSIS

2"a I. F.

PHONO.TERM.BRD. 2T5,0002I. TRANS.

2.144EGS. I 2'4°. OCT. r-.- 31 1 I .- 75 8'-6T

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220,000A

8.6,. J

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------T 54,000.

' n 8.6. 13.1I

8.6n 1sT DET. LJG 8OSC. 1.* t.r

6A7 TRANS.

a-12919-1

Figure 5-Resistance Diagram

Power supply disconnected-Radiotrons in sockets-Tuning condenser in full mesh- Range selector "Standard broadcast"-Radio--Phono "Radio"

Volume control maximum

114.1-i ii

' CRESISTOR RSSE`NLp 16K T -

8,7_RG

s6K j iau*r II

OUTPUT 45

r

REGSTOIrEr.

'----318V.

---- -340v. R.C.-

ANT. COIL

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1

340V. R.C.

1

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r r

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°L12 II v Oro

101/

1---340V.---

100V.---

-0 V.-

CCi.iawi c.

Figure 6-Radiotron Socket Voltages, Coil and Trimmer Locations.

Measured at 115 volts, 60 -cycle supply-Tuned to approximately 1,000 kc ("Standard broadcast")- Radio-Phono "Radio"-No signal being received-Volume control minimum

Note: Two voltage values are shown for some readings. The value shown in parentheses with asterisk (*) indicates operating conditions without voltmeter loading. The other value (generally lower) is the actual measured voltage and differs from the value shown in parentheses because of the additional loading of the voltmeter through the high series circuit resistance.

:I¡ Radiotron Plate Current Readings Measured with Milliammeter Connected at Tube

Socket Plate Terminals Under Conditions Similar to Those of Voltage Measurements

(1) RCA -6A7 -1st Det.-Osc. 11 ma. (2) RCA-6D6-I. F. Amp. 10 ma. (3) RCA -75 -2nd Det., A.V.C. and A. F. 0.22 ma. (4) RCA-42-Power Amp. 42 ma. (5) RCA-80-Rectifier 63 ma.*

Figure 4-Loudspeaker Wiring (*Cannot be measured at socket.) c;:22!.",.1



16 RCA MODEL 5U Alignment,PhonoData Parts

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RCA PAGE 9 -

MODEL 5U

RCA MFG. CO., INC. Parts List,Part 2

Stock No. DESCRIPTION List

Price Stock No. DESCRIPTION List

Price

11364 Resistor -33,000 ohms, carbon type, 1/4 12083 Motor -105 -125 -volt, 50 -cycle motor watt -Package of 5 (R7) $1.00 (M1) $11.10

5029 Resistor -56,000 ohms, carbon type, % 9733 Motor -105 -125 -volt, 25 -cycle motor watt -Package of 5 (R1) 1.00 (M1) 11.00

11282 Resistor -56,000 ohms, carbon type, 1/10 9734 Motor -200 -250 -volt, 50 -cycle motor watt -Package of 5 (R5) .75 (M1) 10.50

11365 Resistor -82,000 ohms, carbon type, % 4456 Motor accessories -Comprising three watt -Package of 5 (R12) 1.00 nuts, one shield and one screw .10

5145 Resistor -100,000 ohms, carbon type, 1/4 12048 Turntable -Turntable assembly complete watt -Package of 5 (R9) 1.00 with rotor laminations, 60 -cycle opera -

11398 Resistor -220,000 ohms, carbon type, tion 4.80 1/10 watt -Package of 5 (R6) .75 13084 Turntable -Turntable assembly complete

11323 Resistor -270,000 ohms, carbon 'type, % with rotor laminations -25 -cycle opera - watt -Package of 5 (R10) 1.00 tion 5.45

11847 Resistor -390,000 ohms, carbon type, 1/4 12049 Turntable -Turntable assembly compelte watt -Package of 5 (R11) 1.00 with rotor laminations, 50 -cycle opera -

11626 Resistor -2.2 meg., carbon type, 1/4 watt tion 4.80 -Package of 5 (R3) 1.00 4083 Washer -Leather washer -Package of 10 .20

12651 Shield -Antenna coil shield .22 4084 Washer -Metal washer -Package of 10 .26

13311 Shield -Chassis end shield and rubber PICKUP AND ARM ASSEMBLIES mounting foot assembly -Package of 2 .80 3812 Armature -Pickup armature (L50) .... .32

12607 Shield -First I. F. transformer shield top .30 13568 Coil -Pickup coil .60 12008 Shield -I. F. transformer shield .28 4543 Damper -Damper block complete with 12799 Shield -Oscillator coil shield .15 damper clamp, washer .10 12581 Shield -Second I. F. transformer shield 13567 Pickup and arm assembly complete 7.10

top .36 3811 Screw -Needle holding screw -Package 3682 Shield -6A7 or 75 Radiotron shield .22 of 10 .46 3950 4794

Shield -6D6 Radiotron shield Socket -4 -contact 80 Radiotron socket

.26 .15 REPRODUCER ASSEMBLIES

4786 Socket -6 -contact 6D6, 42 or 75 Radio- 12641 Board -3 -contact reproducer terminal tron socket .15 board .15

4787 Socket -7 -contact 6A7 Radiotron socket .15 12640 Bracket -Output transformer mounting 11199 Socket -Dial lamp socket .14 bracket .18

12007 Spring -Retaining spring for Stock Nos. 12012 Coil -Field coil (L16) 1.85

12006 and 12664 -Package of 10 .36 11469 Coil -Neutralizing coil (L14) .20

12796 Switch -Range switch (S2) 1.00 12642 Cone -Reproducer cone and dust cap 13309 Switch -Tone control and power switch (L15) .94

(SI, S3) .55 5118 Connector -3 -contact male speaker 12801 Transformer -First I. F. transformer cable connector .25

complete (L10, Lii, C10. C11) 1.70 9699 Reproducer -Complete 6.38

12653 Transformer -Second I. F. transformer 11253 Transformer -Output transformer (T2) 1.56

complete (L12, L13, C13, C14, C15, 11886 Washer -Spring washer to hold field coil R5, R6) 2.06 securely -Package of 5 .20

13392 Transformer -Power transformer, 105- MISCELLANEOUS ASSEMBLIES 125 volts, 50-60 cycles (T1) 4.95 13564 Cable -3 -conductor shielded input cable,

13566 Transformer -Power transformer, 105- approximately 321/2 inches long, con - 125 volts, 25-50 cycles (T1) 4.80 nects receiver to radio -record switch .50

13393 Transformer -Power transformer, 110 4840 Capacitor -0.25 Mfd. (C51) .30 and 220 volts, 50-60 cycles (T1) 4.95 12785 Crystal -Station selector escutcheon and

12654 Trap -Wave -trap complete (L1) .75 crystal 1.00 13144 Volume control (R8) 1.00 12699 Knob -Large station selector knob -

MOTOR ASSEMBLIES Package of 5 .68

10194 Ball -Steel ball beari Packa a of 20 fig- g .25 12700 Knob -Small (vernier) station selector

knob -Package of 5 .58 11740 Base -Motor base and bearing assembly 1.45 11347 Knob -Volume control, tone control, 11733 Coil -Stator assembly, comprising coil range switch or radio -record switch

and laminations, 105 -125 -volt, 60 -cycle knob -Package of 5 .75 operation ... 2.96 11377 Screw -Chassis mounting screw assem-

11734 Coil -Stator assembly, comprising coil bly, comprising one screw, one washer and laminations, 105 -125 -volt, 50 -cycle and one lockwasher-Package of 4 .12 operation 3.08 11869 Screw -Motor mounting screw assem-

11735 Coil -Stator assembly, comprising coil and laminations, 105 -125 -volt, 25 -cycle

bly, comprising one screw, three metal washers, two rubber washers, one lock -

operation 3.08 washer, two spacers and one nut - 13081 Coil -Stator coil assembly, comprising Package of 3 .32

coil and laminations, 200 -250 -volt, 50- 11349 Spring -Retaining spring for knob, cycle operation 4.60 Stock Nos. 11347 and 12700 -Package

11748 Damper -Motor damper assembly, corn- of 5 .25

prising one damper, one damper plate, 4982 Spring -Retaining spring for knob, one screw, two rubber washers and Stock No. 12699 -Package of 10 .50

one "C" washer .20 13563 Switch -Radio -record switch (S10) .... 1.05

12082 Motor -105 -125 -volt, 60 -cycle motor 13565 Transformer -Phonograph input trans - (M1) 11.10 former (T10, C50, C52, R50, R51, R52) 2.95

Prices quoted above are subject to change without notice.



18 RCA MODELS HF-6,FIF-8,

Ú132,U134 liotor,Gear Mechanism

KNOB SHAFT PULLEY, 31271

CONDENSER DRUM DRIVE CORD, 31283

KNOB -SHAFT DRIVE GEAR ANO HUB. 31239 INTERMEDIATE DRIVE GEAR AND PINION 31238 (50/60 CYCLES) 31545 (25 CYCLES)

LUBRICATE KNOB SHAFT BEARINGS WITH PETROLEUM JELLY

ROTOR SPRING

RCA MFG. C'O., INC.

KNOB SHAFT

S12

C wASNERs

TT -r__944

ENGAGING ARM

USED ON MODELS HF-6,HF B

e3I235(50/60 CYCLES) MOTOR 31246(25CYCLES)

ROTOR IS PULLED FORWARD WHEN MOTOR IS ENERGIZED AND THE ENGAGING ARM ENGAGES WITH CLUTCH.

FLYWHEEL 31240

GEAR -MESH ADJUSTMENT STUDS (SET FOR MINIMUM BACK -LASH ANO FREEDOM FROM BINDING BY ROTATING STUDS)

DRIVE GEAR MOUNTING SUPPORT ANO STUD ASSEMBLY, 31680

O O

FRICTION ADJUSTING SCREW 3124I SEAL WITH HOUSEHOLD

CEMENT.

31491 BRACKET MODELS U-132, U-134 ONLY

ADJUST SCREW WHEN MOTOR 15 IN VERTICAL POSITION(DRIVE-END UPWARD) UNTIL THE ROTOR IS MOVED UPWARD 1/32; THEN BACK UP SCREW 1/2 TURN AND LOCK IN PLACE WITH NUT.

WW

LUBRICATE GEARS WITH PETROLEUM JELLY. USE LIGHT MACHINE OIL ON GEAR BEARINGS

-DRIVE GEAR CLUTCH AND PINION GEAR 31237 50/60 CYCLES) 31544 (25 CYCLES)

MOTOR SHAFT AND PINION SHAFT MUST BE IN LINE

A. F. C. SHORT I NG S W. (S7)

MOTOR MOUNTING SUPPORT AND STUDS 31678 (50/6OCYCLE5) 31 67 9 (25 CYCLES)

USE LIGHT MACHINE OH_ AT MOTOR BEARINGS

BRASS -C-- WASHER _WASHER

31492 BEARING MODELS U-132, U-134 ONLY

SPRING 31494 (25 CYCLES) 31493 (60 CYCLES) MODELS U-132, U-131

Motor and Gear Mechanism

There must be 1/32 -inch clearance between the end of the engaging arm and the face of the intermediate gear when motor is in its full forward position.

Lubrication

Motor bearings and gear bearings; use light machine oil. Gear faces; use "Pure Oil No. 611" or petroleum jelly. Dial -indicator pulleys and rails; use "Castordag" or petro-

leum jelly. Selector disc; apply thin film of petroleum jelly. Friction leather on flywheel; apply "neats-foot" oil. When

replacing leather, soak it for at least 24 hours in neats-foot oil, and insert in flywheel while dripping.

the

Adjustments

To adjust S12, loosen knob shaft pulley, and adjust it so that when shaft is pushed all the way in, the ends of the leaves of S12 will be deflected 1/32 -inch from their original position. When tuning shaft is released, distance between contacts of S12 should be 1/32 -inch.

S7 should be adjusted so that when motor is in its full forward or upward position, the ends of the leaves should be deflected 1/32 -inch. from their original position.



RCA PAGE 9-19;4)

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2 15M

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RCA MFG. CO.. INC.

6K7 21t2 I F

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C37 2500 MME

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MODEM' EF-6,U132 Schematic

6F6 OUTPUT

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a

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a m a

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I VICTROLA u SW. " a: ti SIo

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I D. F

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1 C 45 IS

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C29 I 470 L30 MME 4.6A

10004. Tc28 C30

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1/VVV).. 56.000A

ELEC. TUNING SW.

FRONT 0.1 * 55 . iio

RIB 560,00011

TUNING 2.4211 - MOTOR

M =. e STATION SETTING

CONTACTS

STATION BLACK

BROWN

SELECTOR SW

1-1

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GREEN

2

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RED

BnTOTAL

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7

3 SELECTOR

DISC.

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RED - YELLOW DIAL TUNING

m

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M

a

a

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C51 0.5

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57 A.F.C.

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6H6 DISCRIMINATOR

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sIo 00

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alb RADIO-VICTROLA

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MODEL U-132 ONLY.

6J5 INVERTER

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R31

C57 470,000A 0.25 MFD.

R 103 -WA`, 2.2MEG,4_

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II

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7002

6F6 OUTPUT

R3

PICKUP SHORTING

SWITCH - T

5101/ Tf 1

CRYSTAL PICKUP

(-4 VaF`'JJJV,i I MOTOR M2 1

S102 -\ 96A 60", 72.3A 50-60", 1052 25n,

1-C

C70 .05 MFD.

IF PEAK 455 KC

C

C

RANGE SWITCH SHAFT C FIDELITY SWITCH SHAFT

NOTE COIL RESISTANCES NOT SHOWN ARE LESS THAN ONE OHM.

Schematic Circuit Diagram -Models HF -6, U-132

BLACK BROWN STATION SELECTOR 8 DIAL LAMP

FIELD

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18001L

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BROWN

195 A 60"' 256n 25'

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TO HEATERS S DIAL LAMPS.

YELLOW-,

BLUE

TO GROUND ON OSC. TUBE

TUNING MOTOR WINDING 24 VOLT YELLOW

L38 10A

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IPOWER !SWITCH

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RCA PAGF, 9-21.22

MODELS HF -8,U134 Schematic

4.4.410

m am m 191

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CG 180

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RCA MFG. CO., INC.

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8000 2500 MME MME MMF

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1213

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C45 15

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A I C29 1 470

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Schematic Circuit Diagram -Models 11F-8, U-134 YELLOW

RCA PAGE 9-23

MODEIS IT -6,U132 - RCA MFG. CO., INC'. Chassis wiring

Voltage

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RCA PAGE 9-25

RCA MIFG. CO., INC. G AI A2 A33,ß.

CAPACITORS C75,C7B 4 C77 ARE MOUNTED t. L25 DSC

HORIZONTALLY IN MODEL 1).132 lK

YELLOW

6,17 OSC

TI

514 RECT

TO VICTROLA JACK

25M 11.601:4«.

13.200K.C. (111)

124 OK.

BIBL

DUDELS HF -6,U132 HF -8,1)134

Socket,Trir¡uners

GR[[

L26 05C. 123 05C31M

V ND j9600K.0 /96Ó0K.C.

LOO A BAND

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BROWNI - BLACK j `'T T

I

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TO TONING/1 I 14Óó MOTOR 'I

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1455 K.0

C3

NOISE TRIMMER

6U5 TUNING INDICATOR C5'..;22;

20,00 B..CC

TO TO lJ VOL CONT CS2

C27 OSC. 'C BAND 0 20,00 K.C.

C9 OCT .% BAND

1300 K.0

COO 05C. 'A BAND 15000 KC

T2 OUT PUT

TRANSFORMER

6J7 CU OSC CONTROL

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V C41

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6L7 1" I.F. 15T DET TRANS.

C13 DET SIM

CS ANT 9600K BAND

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CT ANT 31M

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TO PILOT LAMP.,'

BLACK

h SEC ADJ.

LIA 435 KC

6K7 R. F.

6F6 6.15 OUTPUT INVERTER

6F 6 6J5 OUTPUT 2"OA-F

12 f0 .) SEC ADJ

1.19 435 K.0

\ 2"I.F 6K7 \TRANS.

b l ` /

16H6 6K7 7 DISCRIMINATOR,2"' i. F

SEC ADJ` LOI -

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RED RED -BLACK

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G Al A2 A3 -YELLOW

KKK / AFC OFF" MANUAL TUNING /

SWITCH / TO

OSCILLOGRAPH -HI TO THIS TERM.

SELECTOR DISC LOW TO CHASSIS

Top View-Models HF -6, U-132

CAPACITORS C75 C76, C78.4 C77 ARE MOUNTED HORIZONTALLY IN MODEL U-134

YELLOW

6J7 OSG>

TI

C31 16

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6L6 6J5 OUTPUT INVERTER

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SEC ADJ 119

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6K7 \\TRANS.

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/ OSCILLOGRAPH CHI TO THIS TERM.

LOW TO CHASSIS

SWITCH

Top View-Models HF -8, U-134

RED -YELLOW

©John F. Rider,. Publisher

BROWN- BLOC RED BLACK

YELLOW


26 RCA MODELS HF -6,1;132

HF -8,11134 Specs.,Circuit Data Tuner Data,Notes



RCA PAGE 9-2J MODELS HF -6,U132

HF -8,1134 Tuner Mechanism Transformer Data Tuner Data

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RCA MFG. CO., INC. HF -6,11134 Parts List

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l'AG1'. 9-30 RCA

MODEL 9X Schematic ,Socket Voltage,Specs.

Lead Dress,Notes RCA MFG. CO., INC. Chassis Wiring

Dial Lamp Mazda No. 40, 6.3 volts, .15 amps.

POWER SUPPLY RATINGS A -C Rating 105-125 volts, 50-60 cycles, 50 watts D -C Rating 105-125 volts, 50 watts

CAUTION: The chassis is connected to one side of the power supply. Avoid contact of chassis or parts to external ground when servicing.

Reel up the antenna wire, and keep it away from chassis during alignment. Connect the high side of test -oscillator through an 80 mmfd. capacitor to the antenna terminal. Connect low side of oscillator to receiver chassis through a 0.1 mfd. crapacitor. Turn gang condenser to minimum (full out), tune oscillator to 1,760 kc, con -

Precautionary Lead Dress 1. Dress detector grid lead close to top of speaker chassis. 2. Dress lead from grid of 6K7 to gang condenser away from

detector section of gang, and clear of rotor plates. 3. Dress speaker leads close to, but not touching, cone. 4. Dress pilot lamp leads close to top of chassis, and clear of

rotor.

C2 12-400 MME

C1,

MFD.

ANT. COIL

L1

60n 3

CHASSIS

C3 3-15 NAME

L2 VOL. 5n CONTR.

R1'" '2 50.000n TOTAL -

6K7 R. F.

p © © ,e 1 i

CM DET- COIL

L3 90u

BOTTOM VIEW OF

TUEE SOCKETS

POWER OUTPUT (125 -volt, 60 -cycle supply) Undistorted 1.0 watt Maximum 1.5 watts LOUDSPEAKER Type 8 -inch Electrodynamic Voice -Coil Impedance 8 ohms at 400 cycles nett an output meter across the voice coil, and turn volume control to maximum.

Adjust the two trimmers (C3 and C6) on side of gang condenser for maximum output, using lowest possible output from test-oscilator.

Pre-setting Dial.-With gang condenser rotor plates turned full in for maximum capacity, loosen dial -drum set -screw, and turn drum so that the top edge of dial (low -frequency end) is approximately 1/16 -in, below level of gang frame, and tighten set -screw.

25 -Cycle Operation For 25 -cycle operation, connect a 16 mfd., 150 -volt dry electrolytic

capacitor (Stock No. 31323) in parallel to C13.

UP

1

(ON VOL. 1 CONTR. /

C12 0.25

MFD.

BROWN

'`RED

200e.

SECT.

STOP

C5 I2-400 MME.

2

C4 05 = MFD.

L4 Sn

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C6 I 3-15

MM

R2 10MEG.

025 R3

= MFD. 2.2 MEG.

6J7 DET.

= R 6'

C10 .01 MEO.

Cet 01MFD)

1' R4 1170,000n.

150,

-Al

25L6 OUTPUT

C9 300 MMF.

L5

T1

R5 IMEG.

YELLOWS BLACK

3 HUM NEUT. o COIL d L6 i

C131 FIELD C114 I

® ® _ MFD L7-400 5 16 MFD. _

© / © DIAL LAMP Frequency Range 540-1,760 kc / i Alignment Frequency 1,760 kc (ant., det.)

0

YELLOW WHITE

® (IN POWER.'I 25Z6 \ CORD 1- 1

RECT.

uu

OCT. 6J7, --i

02v >1 (ADV.>) 0.5v 2V.

©RCA 9x

MrG CO. INC. P-84309-á

R7 115n.

LI ,-2/L2

ANT. COIL

CATHODE CURRENTS 8O. 4 5 MA. (VOL.CONTR. M I N.)

1 O. 3 MA.(VOL.CONTR.MAX.) 0. IT MA.

44.0 MA. TOTAL RECTIFIED -B-CUNNENT 54.5 MA.

I05V.'


Figure S-Radiotron Socket Note: Values with (") are operating voltages.

Values not starred are actual measured voltages. Measurements made to chassis unless otherwise indicated. Measurements made with set tuned to quiet point, volume control

at minimum, using 1,000-ohm-per,volt meter, having ranges of 10,


L2

RECT. 25Z6

I- - 25V. A.C.

L_ -

R8 25n

TO GANG CONO. CS -C3"

TO DIAL LAMP

ANT.. TERM.

R. F. 6K7 `

2V. (VOL. MAx) ,1

15V.(VOL.MIN.); / ...

POWER so Voltages, and Location of Parta CORD

50, and 250 volts. (Use nearest range above the specified measured voltage.)

Values should hold within approximately ± 20% for 117 -volt 60 -

cycle a -c supply. On d -c, voltages are approximately 10% lower, except heaters, which remain the same.

O M CAN men Ml.!


RCA PAGE 9-31 MJDEL 82d

GREEN CZ C3 3-30MMF. / 9-365MMF.

L1 2.n

-4 CI

680 MMF.

C4: O.1 MFD.

RCA MFG. CO., INC.

157.0ET.4O5C. I.F. 6ABG 6K7G

L4.N¡.III' L5 -7.2n "

C AIN._ LL .2Q/

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5.6 MMF (06 SOME MODELS)

DIAL LAMP

FUSE SI FI

SPARK CI7 PLATE -,Z

POWER SWITCH L VOLUME CONTROL

OS, COIL

GREEN

1937,

GREEN

TRANS.

2 F

TO ALL HEATERS FIELD

IsT.I.F.

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BLACK

L9 4.8A rC1B--- BLUE

15000A

2MODET,A.F.lyA.V.C. 6QTG

T- 9.6A B

Cl2 470 M MF

VOLU ME CONTR.

R3 CII R4 0.1 500,0004 MFD.

IF PEAK 460KC

0.5 LB J MFD

rL1O-.03n ll

TO - 6X5G I -i: HEATER I YELLOW

OUTPUT 6 N6G

1sT. DET 4 ose.

Note: Two voltage values are shown for some read. ings. The value shown in parentheses with asterisk (') indicates operating conditions without voltmeter loading. The other value (generally lower) is the actual measured voltage and differs from the value shown in parentheses because of the additional loading of the voltmeter.

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I

OUTPUT I I

-1.2V. I -16V. I C22 6.3V.- 6.3V. r -6.3V. - 6E6 -6 I I I I I r C21,<23,L /t-A..T C23

O© - I 2isv zzavi © Ges-- )®- J J i I

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is -T IF TRANS.

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R6 270A

R7 R8 39A 39A

P2 C2O 0.25 MFD.

RECT. 6X5G

0 ® 0

T 2N° I F TRANS.

R14 1200,

Schematic ,Socket Voltage,, Triomiera

OUTPUTChassis Wiring 6KBG

CIS .oI MFD

o o Ci

RIO G 470,00OÁ

C16 .OV5 MFD.

©RCA M FG. CO. I NC M-81929-3

REO

GREEN 45TÁ

T2 I

BLACK -

C2' Z I C22 .L C23 TT6MFD. GUI FO ;IOMFD.

-RED C2z

T VIBRATOR

BLACK

LII

3 EA.

C21

CATHODE RAY OSCILLOGRAPH VERTICAL'HI- TO THIS TERM. CONNECTIONS VERTICAL "O' TO GROUND

N

O Ol i.F o ® 6.06

Búá

© RCA MFG. CO. INC. P-94194-0

-- °c 22 BOTTOM VIEW OF CHASSIS --O c_Kcc5

-ANT 6001w.

-LI - L y SLc ADJ.

FC4MeG.00.,InC 460 KC SN -,793 4A.V.C..

I ----- (-16V.P) 6C1-1-0 6-G il 0.7V.

I 2^P-I.F.TRAN3.

ssv. r , I °RI.

Z CG. I ADJ

L r - 12T.OET., OSC T (-1.TV. ^l; GAB -G -1.7V. ,^^`'^'

--o.rv, f - I F6.3v '' - 6.3V. I ls.. I F TRANS. I ('I.TV,4)

" ; -alv.

Voltage values as specified should hold within ±200 when the receiver is normally operative at its rated line voltage. To duplicate the conditions under which the voltages were measured reqwres a 1,000 -ohm -per -volt d -c

meter, having ranges of 10, 50, 250, and 500 volts. Use the nearest range above the specified measured voltage. A -C

voltages were measured with a corresponding a -c meter. (Measured

c.ß I

F -ow ; .4 PRI O.On. _ I O 1ADJ. L ® -1

...0 RC O.. xtsv (LI) I ' I. F.

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BOTTOM VIEW OF CNASEI6I, 1 t )

21

CATHODE CURRENTS

re.1 . 16.361 No, OMNI

N S. 44.591! R. REEANNOT OE

SECRET. MEASURED

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Figure 4-leadiotron Socket Voltages and Trimmer Locations at 6.3 volts battery supply -Volume control minimum -No signal input)

TAGE 9-32 RCA MODEL 8M Alignment,Specs. Data., Parts

RCA MFG. CO., INC.

Stock No. DESCRIPTION List

Price Stock No DESCRIPTION Lin

Price

RECEIVER ASSEMBLIES 12879 Resistor -2.2 Megohm, insulated, 4 watt (RS) - Package of 5 1.00

11360 Cap -Grid contact cap -Package of 5 80.S5 5129 Ring -Retaining nog for Radiotron shield -Pack - 30837 Capacitor -Adjustable trimmer (C2) .90 age of 5 .15 12406 Capacitor -47 timid. (C10) .25 12418 Screw -No. 8-32 a 3/16 -in. slab -head set screw for 14282 Capacitor -110 Mmfd. (C8, C9) .30 drum, Stock No. 30830 -Package of 10 .25 13894 Capacitor -990 Mmfd. (C14) -Package of 6 1.25 30838 Shield-Radiotron shield .25 30625 Capacitor -390 Mond. (C7) .30 13686 Socket -i -contact vibrator socket .20 30673 Capacitor -470 Mmfd. (C12) .25 11196 Socket -8 -contact Radiotron socket .25 14498 Capacitor -680 Mmfd. (C1) -Package of 5 ' 1.50 30631 Spring -Tension spring for drive cord -Package of

4838 Capacitor -.005 Mfd. (C18) .25 10 .96 30828 Capacitor -.0075 Mfd. (C19) .90 14378 Transformer -First I.F. transformer (1...4, L5, CO. 14393 Capacitor -.01 Mfd. (C15) .30 C9) 2.45 4886 Capacitor -.05 Mfd. (C13) .20 90872 Transformer -Second I.F. transformer (Le, L7, 4839 Capacitor -0.1 Mfd. (C4, C11) .30 C10, C12) 2.10

12484 Capacitor -0.25 Mfd. (C20) .30 30833 Transformer -Vibrator power transformer (T1, Lia, 30634 Capacitor Pack -Comprising two 8 Mfd. and one C18) . 5.00

10 Mfd. sections (C21, C22, C23) 1.50 13888 Vibrator -Plug-in vibrator (L12) 3.35 4958 Clamp -Mounting clamp for capacitor pack, Stock 30828 Volume Control and "ON-OFF" switch (R4, S1). 1.50

No. 30634 .15 30639 Coil -Antenna coil -less shield (L1) 1.00 REPRODUCER ASSEMBLIES (84147-2) 30636 Coil -Oscillator coil (L2, LS) .60 30627 Condenser -2 -gang variable tuning condenser (CS, 30782 Cone -Reproducer cone and voice coil (L11) 1.20

CS, CO) 2.30 Reproducer, complete (L9, Lib, T2) 4.40 30632 Cord -Drive cord -Package of 6 .25

,30781 30783 Transformer -Output transformer (T2) 1.45

30629 Dial -Dial scale and holder .70 30630 Drum -Dial drive drum, complete with set screws .70 MISCELLANEOUS ASSEMBLIES 12415 Resistor -39 ohms, insulated, 4 watt (R7, R8) -

Package of 5 1.00 5025 Capacitor -Generator capacitor .45 30540 Resistor -100 ohms, insulated, 4 watt (Ril, R12) 5023 Fuse -15 limp. -Package of 5 .40

-Package of 5 1.00 30640 Housing -Receiver case only 3.80 13744 Resistor -270 ohms, carbon type, 4 watt (R8)- 4290 Insulator-Foseholder insulating sleeve -Package

Package of 5., 1.00 of 10 .20 6134 Resistor -1,200 ohms, carbon type, 1 watt (R14) 30642 Knob -Tuning or volume control knob -Package

-Package of 5 1.10 of 5 .85 12695 Resistor -15,000 ohms, insulated, 4 watt (R13)- 117135 Lamp -Dial lamp -Package of 5 1.15

Package of 5 1.00 7788 Lead -"A" lead (ammeter end), complete with fe - 14168 Resistor -15,000 ohms, carbon type, 2 watt (R3). .25 male section of fuse holder .40 12286 Resistor -56,000 ohms, insulated, 4 watt (R1)- 30841 Lead -"A" lead (chaisis end), complete with male

Package of 5 1.00 section of fuse holder .30 12199 Resistor -270,000 ohms, insulated, 4 watt (R9)- 30643 Lead -Shielded antenna lead (chassis end), corn -

Package of 5 1.00 plete with female section of connector .30 12285 Resistor -470,000 ohms, insulated, 4 watt (R10)- 30846 Mounting -Complete set of bracket., nub, washer.,

Package of 5 1.00 and screws for mounting receiver .45 13730 Resistor -1 Megohm, insulated, 4 watt (R6)- 30644 Socket -Dial lamp sorbet and lead .30

Package of 5 1.00 5024 Suppressor -Distributor suppressor .40

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RCA PAGE 9-3ÿ$

RCA MFG. CO., INC.

IF PEAK 260 KC

Figure 1-Schematic Circuit Diagram (Model 8311)

Refer to Figure 3 and Note No. 1 in Replacement Parts list before servicing these receivers

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MODEL 8?LL Schematic MODELS 8ML,8M2 Socket,eimmers Voltage

p1

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260 NC PAS. N2.^ DET.%q.VC

14.r.FTRANS.

lST-OET.$OSC

OUTPUT

3 f 6A8 2 0 SCA MFG. CO., IN C.

L.F. OS C. CIO

L 600 NC

SN-TT3

ANT.-C2 1400 NC

Figure 8-Radiotron and Trimmer Locations (Models 8M1 and 8M2)

Z"O I.E TRANS.

LB,16

L9, 16^

YELLOW TO TERN Y' ON i' II TRANS.

----RED TO OR

"'YELLOW TO VOLUME CONTROL

- -BLUE To TUBE NO.3 PLATE

\BUS TO TUBE N0. 4 DIODES

BM I RUN A ONLY (.3TAMPEO TLaT0-I)

2ND I E TRANS

- YEIIOW TO TERM. ïON 1' I.E TRANS.

Q --BLUE TO TUBE NO.3

0 PLATE

/ 1

_ el

- CONTROL

YELLOW TO WLUME

II oils TO TVBE N0. 6 DIODES

RED TO B 8,11 RUN ONLY Ornino 84096-41 "

R e-, Nee-, co, ere

l8, 29^ C9, 29

_TO CHASSIS

Figure 3-Second I -F Transformer Connections (:Model 8M1)

Refer to Note No. 1 in Replacement Parts list.


} AGE J-34 RCA

IF PEAK 260 KC

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MODEL 8M2 Schematio,Changes Power Unit Changes

RCA MFG. CO., INC.

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®John F. Rider, Publisher www.americanradiohistory.com

I

Figure 6-Parts Location for Power Unit (Model 8M2, Run "A")

Refer to Note No. 2 in Replacement Parts list.

RCA PAGE 9-3 c



36 RCA

MJDELS 8Ì,842 Alignment,Parts Specifications ,Data

RCA MFG. CO., INC.

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RCA PAGE 9-37

R.F. C3-3-35 C4 6K7 -G MME. ) 13-360 ri 'JAME/ 2A\

úi

I-ó co 0 660

i=.MMF. C5 .025

CI MFD. 22MMF,

R2 390n

R1 R3 100,000n 22,000n

TO ALL HEATERS

RCA MFG. CO., INC.

13T DET.II,OSC. 6A B

CT 3-35 MMF.

C9 _ ¡

.05 MFD.1 R4

56,000n C8 13-360 MMF.

, C29 1000

\MMF.

V! SI DIAL

'A" HOT FUSE LAMP

C30 SPARK PLATE -

R.F. 6K7 -G 6A8 400-800

C4 L4 CB / MMF.

L2 I1r 13-360 Tn 13-360 L , 2..{II MMF L3yI i `r l

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ol os úr L7-2 I

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ÿ11`6IMt'. ; C51 MFD. t MMF.01tx/ 4n MMF. / / ti

CI 'Mil 56,000a Cll R5 / 1 C20 22 = P.3 3-35MMF. I T.005 '-

---,,<,. MMF. C3 22,OOOn 1600. MEE) -35(( MME l C40'.025MFD. /

C11 3-35 MMF.

©RCA MFG.CO.INC M-81968-3

FIELD YELLOW

T1 YELLOW -7-

L13 .02m 0.1.

C31-. RED- C32 0.5 T BLACK o.5 MFO.i__

BLUE --

O

LE. 6 K7

C16 2NoDET.,A.F.,$A.V.C. 4T MME 6R7 -G

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h S OP

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F390M 66OOp01MFD..a035MFD o R6 MFD. O I C24 \

1y N 220000 rv \35MFD. C14 I r C20-.00smr°. T 109 MMF. u 4 N C25 a

I úo e a' 10 I

MODELS 821&i,82d4

Schematics,Socket Tr irrmer s, Spec s

DRIVER C26 OUTPUT .01 MFD. 6J5YELLOW\T2`` ewe,

MED. U.

CIS \ ió 0.1 MFD` 1BO,OOOw ) I \t\ RI3-4T,000. ?

350,000nSECT.) I \R12 1MEG,

VOL. CONTR. r R:0-3300n. ¡ GREEN-` RB- MEG.

BROWN-BLACK

GREEN > C33

1 L14' 1000. 1

MED. TT C36 T C37 y; a., mpg). 2 BMFD.

C35 1000 MMF.

R2 1000rt

NWVV. R1

100,000n

DIAL LAMP

'A" MOT FUSE Si

C30` SPARK PLATE

1sT DETßOSC. C70

5, LI' ((TOP/

TO ALL ©RCA MFG. CO. INC. HEATERS M-81977-3

C15 iy 0.1 =_ MFD.

W v0 Z-

O

C34 .01 MED.

13

R11-1 MEG.`--RED- BLACK TO HEATERS

0.4n BLACK

2.5 v LIS

BLACK

rit C3B SPEAKER = C39 330 SOCKET 330 MME. MMF.

R17- 1 Oon Figure 1 -Schematic Circuit Diagram (Model 8M3)

I.F. C16 2N0.DET.,A.F.,6A.V.C. DRIVER OUTPUT 6K7 4T GAME. \ 6R7 -G 6J5 6N7 -G

YELLOW 72 LUE

D-le C

29ñ C

C19 390 MM F$4C

R9 6B000n R6 -22o,000

L10 29. OP 4

16 UPa ji t I o d izo

2 ° r 1MMF. 0.3

! ç C ? MFD. ' 035

a MFRIO

ó ó 33/00n y H t

MFD.

1 C25¢

-. 10 n S. N "N ---

Rt R13 C41 47000.

2j

R7 120,000 I 10

350,000nSECT. MFD

VOL.CONTR /= RB R19 MEG. - 2200.

a

` R12

R I 1 MEG.

C29 BAOWN-BLACK RIB .

1000 Ti 100.1 MME.

íL11 YELLOW,.

REO -BLACK LI3

`.02h OAR

111 C31. 0.5D.= C30.5 'T MF = MFD.

Figure 3 -Schematic Circuit Diagram (Model 8M4). BLUE BROWN

General Description

GRE

Model 8M3 consists of a six -tube, superheterodyne auto,

mobile receiver and a six-inch electrodynamic loudspeaker contained in the same housing. Design features include an

rf amplifier stage; magnetite core i1 and antenna trans-

formers; automatic volume control; continuously variable

highfrequency tone control; aural -compensated volume con trol; ignition -suppression filters in both the antenna and

power -input circuits; and a resistance -capacitance coupled

C33

MFD.

18R.

L14 1000n ---.-067)

fC36

=R B I =MFD.= C37=

\C35 == BMFD.

C34 .01

R17-100Á MF0.

C43 330 \ MMF.

1000 MMF. SENSITIVIT

SWITCH S2

1 r R11 I I1 MEG.

REO -BLACK

audio -driver stage feeding into a push-pull, class -B, power -

output stage. Model 8M4 employs a similar chassis to Model 8M3 but

with an eight -inch electrodynamic loudspeaker separately con-

tained in a cylindrical housing. In addition, a sensitivity con-

trol is incorporated which permits the listener to alter the

receiver sensitivity to suit reception conditions. Model 8M3 has a socket on the receiver case for plugging -in an auxiliary speaker, if desired.

TUNING RANGE

POWER OUTPUT RATINGS LOUDSPEAKER

Maximum 9 watts Type Electrodynamic

Undistorted. 6'watts Voice -Coil Impedance 3 ohms at 400 cycles

POWER SUPPLY RATING

Supply Voltage 6.3 volts

Current Drain 7.5 amperes

Fuse Protection 15 ampere

PILOT LAMP Mazda No. 51, 7.5 volts, 0.2 ampere

ALIGNMENT FREQUENCIES I.F., 260 kc; Oscillator, 600 kc and 1,400 kc; Detector, 1,400 kc; Antenna, 1,400 kc

550 to 1,550 kc

6

IC2- -Ñ 1.01MFD. ' \8 uEYELLOW

RE C27-.01MFD.

GREEN RED

470Ms1F C28-0035

MED. t4030. AY1nLYn T3

TO HEATERS

C38 /330 ' \1 1MME

- C42 330 MMF.

TONE FIELD CONTR.

L1 R16 100,000..

á

000 Q

BLACK - C39 330 MME. I

IL

38 RCA YODELS 8M3,8M4 Parts Layouts R-F Chassis Wiring

-I C29

BLACK 31

SMRC3MTL

AP

iRCCN

;mama HEM CII Ióer CIC

CS CA

VIBRATOR TRANS.

T -t L-13 C -3F

YELLOW

GANG CONOENSER

YELLOW

TOP VIEW

BUCK 31

VIBRATOR TRANS.

T-1 LI, C32

RCA MFG. CO., INC.

BOT TOM or

vURATOq

VOLINK CONTROL R -R

R

-L-11T11--

VIBRATOR

2"" DQT,A.F/

kV G. 6R7 -G

:.I OUTPUT. 6N7 -G

/ RN

GTIIOOE MY .NÍ TO THIS !AZ OSCILLOGMPN [ONNFCTg TERM m3

VERTICAL TO CHASSIS

1^ I.F. TRANS.

'DET. Q 056. 6A8

DRIVER 6J5

Figure 2 -Component Parts Location and R -F Wiring Diagram (Mode! 8M3)

1 I.F. TRANS.

® e

YELLOW

GANG CONDENSER

YELLOW CII C7 -CB Olt GREEN

2°n I.F. TRANS.

e

TERM. IRS

CONTROL R-8

-R7

AUDIO

TO T3

TOP VIEW

OrM VIBRATOR

-/e saw "rc cs ,nc

Cgs

cz C2S

BOTTOM VIEW

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RED

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tk4 / RN

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L OUTPUT

6N7 -G

Go® Q

1

CATHODE RAY {VERTICAL 'in" TO THIS 04,,,,,G,,,,, CCNICCTIDMS TTRM

VERTICAL CrTO CHASSIS /

/ / -{ C40 I.-- / I.F / 6K7 /

O: u3

DRIVER 6J5

CO,'

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x

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1^ LE. TRANS.

1^ OCT. Q OSC. 6A8

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C)---

- a

YELLOW

RED CO

TONE SPEAKER CONTROL

RED C4I

Cu C21 C41

SOCKET MOUNTING

Mai

BOTTOM VIEW

Figure 4 --Component Ports Location and R -F Wiring Diagram (Mode! 8M4) Re may consist of two miators connected in aerie having i total valued 1,000 ohms or a single 1,000 ohm resistor. Make replacement.

with Stock No. 14790.

ANT.



CG, 6V.

2V.(BM3) 6.7V.(BM4)

RCA PAGE 9-39

EDDELS 8B3,8144 Alignment,Trinmmers

Voltage,Data

SKT-G Cri. R.E

(Measured at 6.3 volts battery supply-Volume control minimum-No signal input- Sensitivity control (Model 8M4) clockwise)

2"^ DET. +^, 6RT-G OV

u0 GGc'^ 6.6V. (BM3)

roil BV .1 o )B.SV(SMa)

1260KC OQ

Y"s.¡.F.TRANSE

Figure 6-Radiotron Socket Voltages and Trimmer Locations (Models 8M3 and 8M4)

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40 RCA

MODELS 8M3,8M4 Parta RCA MFG CO.. INC.

REPLACEMENT PARTS Insist on genuine Factory -tested parts, which are readily identified and may be purchased From authorized dealers.

STOCK DESCRIPTION Unit List

Price STIOoCK DESCRIPTION

Unit

PriceN

RECEIVER ASSEMBLIES 30800 30303

Capacitor -1,000 Mmfd. (C29, C35) Capacitor -.0035 Mfd. (C28)

.30

.40 13789 Bracket -Chassis mounting bracket and stud as- 4838 Capacitor -.005 Mfd. (C20) .25

sembly-Model 8M4 only .75 4858 Capacitor -.01 Mfd. (C21, C26, C27) .25 13543 Bracket -Chassis mounting bracket and stud as- 13695 Capacitor -Two sections each .01 Mfd. (C33,

sembly-Model 8M3 only .65 C34) .80 30802 Capacitor -22 Mmfd. (Cl) .20 4870 Capacitor -.025 Mfd. (C5, C40) - (C40 in 13141 Capacitor -47 Mmfd. (C16) .25 Model 8M4 only) .20 14262 Capacitor -109 Mmfd. (C13, C14) .30 5196 Capacitor -.035 Mfd. (C24) .20 12404 Capacitor -120 Mmfd. (C17, C18) .30 4886 Capacitor -.05 Mfd. (C6, C9) .20 30832 Capacitor -330 Mmfd. (C38, C39. C42, C43) 4839 Capacitor -0.1 Mfd. (C15, C23) .30

-(C42, C43 in Model 8M4 only) .20 30828 Capacitor -Two sections each 8 Mfd. (C36, C37) 1.60 13894 Capacitor -390 Mmfd. (C19) .25 14902 Capacitor -Comprising two sections, each 10

11978 Capacitor -Adjustable -400-800 Mmfd. (C10) .50 Mfd. (C22, C25)Model 8M3 only 1.10 30433 Capacitor -470 Mmfd. (C44) .30 30829 Capacitor -Comprising three sections, each 10

14498 Capacitor -680 Mmfd. (C2) .30 Mfd. (C22, C25, C41) Model 8M4 only.... 1.30

30793 Coil -Antenna coil and shield (L2) 1.80 30833 Housing -Reproducer housing complete - less 30792 Coil -Oscillator coil -less shield (L5, L6) 1.15 speaker unit and cable 4.00 30794 Coil-R.F. coil -less shield (L3, 1.4) 1.45 9774 Reproducer -Speaker unit only -less case, cable, 30823 Condenser -3 -gang variable tuning condenser and mounting parts 7.65

(C3, C4, C7, C8, C11, C12) 5.25 13797 Screw -Reproducer housing screw .06 12882 Core -Adjustable core and stud for antenna coil .20 12006 Core -Adjustable core and stud for I.F. trans- CONTROL BOX ASSEMBLIES

former .15 Model 8M3 13996 Coupling -Insulated coupling for tuning con-

denser shaft .75 30817 Cord -Dial drive cord -25 ft. length only.... 1.25 13691 Filter -Antenna filter (LI) .75 30820 Cover=Cover shell and spring used on control 30824 Gear -Large gear for condenser rotor shaft 1.25 shafts, beneath knobs .15 30825 Gear -Small worm gear for condenser 1.25 30822 Dial -Oblong etched glass dial .50 13694 Guide -Volume control shaft guide .25 30818 Dial -Round etched glass dial .50 13111 Reactor -Filter reactor (L14) 1.75 30813 Dial Unit -Comprising round dial, escutcheon, 30540 Resistor -100 ohms, insulated, i watt (R17, pointer disc, spring barrel, and cord assembled

R18) .20 -less dial lamp and dial lamp socket 2.50 12281 Resistor -390 ohms, insulated, j watt (R2, R5) 30821 D:al Unit -Comprising oblong dial, escutcheon, -Model 8M3 only .20 pointer disc, spnng barrel, and cord assembled 14720 Resistor -1,000 ohms, insulated, } watt (R2)- -less dial lamp and dial lamp socket 2.50

Model 8M4 only .20 30819 Indicator --Indicator pointer disc .45 12267 Resistor -1,200 ohms, insulated, } watt (R15) .20 11765 Lamp -Dial lamp .23 12194 Resistor -1,800 ohms, insulated, } watt (R5) 30816 Socket -Dial lamp socket and lead .70

-Model 8M4 only .20 30814 Tuning Unit -Comprising knob shaft, bearing, 13716 Resistor -2,200 ohms, insulated, * watt (R19) and gear case -less knob 2.00

-Model 8M4 only. .20 30815 Volume Unit -Comprising knob shaft, bearing, 12312 Resistor -3,300 ohms, insulated, } watt (R10) .20 and on -off switch -less knob 1.30 13669 Resistor -22,000 ohms, carbon type, 2 watt

11646 Resistor -47,000 ohms, insulated, }} watt (R13) .20 CONTROL BOX ASSEMBLIES

12286 Resistor -56,000 ohms, insulated, t watt (R4). .20 Model 8M4 13715 Resistor -88,000 ohms, insulated, * watt (R9,

Rid) .20 13792 Cable -3 -conductor shielded tone and sensitivity 11281 tor -100,000 ohms, carbon type, 1/10 watt Resistor -100,000 30817

cable complete with 4 -prong plug Cord -Dial drive cord -25 ft. length only

1.25 1.25 Rl) .15 30822 Dial -Oblong etched glass dial .50

13734 Resistor -120,000 ohms, insulated, } watt (R7) 30818 Dial -Round etched glass dial .50

13698 -Model only

Resistor -180,000 ohms, insulated, * watt (R7) .20 30821 Dial Unit -Comprising oblong dial, escutcheon,

-Model 8M3 only .20 pointer disc, spring barrel and cord assembled

12264 Resistor -220,000 ohms, insulated, * watt (RO) .20 -less dial lamp and dial lamp socket 2.50

13730 Resistor meg., insulated, j watt (R11, R12) .20 30813 Dial Unit -Comprising round dial, escutcheon,

3584 -1

Ring -Retaining ring for R.F. coil shield .03 pointer disc, spring barrel and cord assembled

13472 Ring -Retaining ring for oscillator coil shield .03 -less dial lamp and dial lamp socket 2.50

13471 Ring -Retaining ring for antenna coil shield... .03 30819 Indicator -Indicator pointer disc .45

6129 Ring -Tube -shield ring .03 30837 Knob -Wing knob .30 3623 Shield-R.F. or oscillator coil shield .20 11765 Lamp -Dial lamp .23

14491 Shield -Antenna roil shield .20 30816 Socket -Dial lamp socket and lead .70

12008 Shield-I.F. transformer shield can .40 30835 Tuning Unit -Comprising knob shafts, bearing, 12218 Shield -Tube shield and ring .20 gear case and sensitivity switch -less knobs 2.95

11196 Socket-Radiotron socket .25 30836 Volume Unit -Comprising knob shafts, bearing,

12241 Socket -Vibrator socket .30 tone control and on -off switch -less knobs.. 3.15

12007 Spring -Retaining spring for core, Stock Nos. 12882 and 12006 .02 MISCELLANEOUS ASSEMBLIES

30796 Transformer -First I.F. transformer (L7, L8, 30839 Case -Receiver case complete -less speaker grille C13, C14) 2.25 -Model 8M3 only 6.25

30483 Transformer -Second I.F. transformer (L9, 30840 Case -Receiver case complete -Model 8M4 only 6.25 L10, C17, C38) 2.25 13109 Capacitor -0.5 Mfd. (C31) 12230 Transformer -Audio transformer (T2, T3)... 5.65 4293 Capacitor -Ammeter capacitor

.70

.60 30827 Transformer -Vibrator power transformer (Tl, 5025 Capacitor -Generator capacitor .45

L13, C32) 3.10 5023 Fuse -15 ampere .08 12236 Vibrator 4.00 30838 Grille -Speaker grille and cloth -Model 8M3 13711 Volume Control (RS) 1.50 only 1.15

4290 Insulator -Fuse holder insulator .02 REPRODUCER ASSEMBLIES (72684-1) 30642 Knob -Tone control knob -Model 8M3 only .13

Model 8M3 7766 Lead -"A" lead (ammeter end) complete with clip .40

12482 12450

Board -Reproducer terminal board Coil -Field coil (L12)

.50 2.00

12445 Lead -"A" lead (set end)_ complete with male section of connector .26

12451 Cone -Reproducer cone complete (L15) 2.00 13806 Ring -Soft rubber ring for speaker mounting - 9687 Reproducer -Complete 5.65

30811 Model 8M4 only

Shaft -Tuning control flexible shaft - approx. .60

25} -in. long 1.20 REPRODUCER ASSEMBLIES 13926 Shaft -Volume control flexible shaft - approx.

Model 8M4 25j -in. long 1.20 12248 Socket -Bracket and socket for speaker cable -

13794 Cable -S -conductor shielded reproducer cable, Model 8M3 only .25 approx. 18 -in. long, complete with 3 -contact 12502 Socket -Bracket and socket for tone control lead male connector 1.10 -Model 8M3 only .30

13795 Coil -Reproducer field coil (L12) for speaker 13804 Socket -Bracket and socket for speaker and con - marked 72947-1 2.25 trol box cables -Model 8M4 only .45

13796 Cone -Reproducer cone and dust cap (L15) for 12254 Stud -Speaker mounting stud, spacer, and speaker marked 72947-1 3.30 washer assembly -Model 8M4 only .45

30834 Cone -Reproducer cone and dust cap for speaker 12448 Stud -Receiver mounting stud, washer, and nut marked 72947-22 (L15) 3.30 assembly .45

11984 Connector -3 -contact male connector for repro- 5024 Suppressor -Distributor suppressor .40 ducer cable .35 12249 Tone Control -(R16) -Model 8M3 only 1.00


O John F. Rider. Publisher www.americanradiohistory.com

RCA PAGE 9-41

RCA MFG. CO., INC.

FREQUENCY RANGE 5501,550 kc

POWER OUTPUT Type Pentode Undistorted 2.1 watts Maximum 4.1 watts

POWER SUPPLY "A" 6.3 volt Auto Storage Battery "B" NonSynchronous Vibrator Current Drain 6.75 amps.

212 N3 0,/i V H WW Z tY V 0 W V _m LL-yt=CC OWZáWp NQ -H11, Q=ó~iaWw UJFOa

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42 RCA EDDEL 9N1 S oc ket, Tr iin ner Chassis Wiring

Mumma Gres: .-The antenna circuit is designed to work

with a low capacity antenna having a total capacity including

the shielded lead-in not to exceed 150 mmf. 1f larger an teams, such as screened top or a double under the running -

board having a total capacity of 200 to 550 mmf. is to be

wed, it will be necessary to reduce the value of the antenna

coupling capacitor C'2 from .01 to approximately 200 mmf.

(.0002). For even larger antenna such as insulated steel

tops, a correspondingly smaller value of C-2 (approximately

125 to 150 mmf.) should be used keeping in mind to use the

largest value possible with which the antenna circuit can be

aligned.

After Mutilation, and with antenna connected, tune in

weak «ado nur 1,400 kc and adjust compensator trimmer

(C-3) for maximum signal output This trimmer is accessible

by prying off the nameplate between the control knobs.

Arden= Filter.-A filter is included in the antenna ciri

cult. Being completely shielded, is preven radiating igni-

tan interference within the set. It also reduces the possibility

of picking up vibrator interference. As. shown in Figure 5,

the filar unit is mounted inside a steel shell which in turn

is welded to the chassis. The shielded antenna lead-in makes

contact with the filter unit within the steel shell and is held

M place by a bayonet type connector.

Pass, Button Tuning Mecluni.m.-The push button tuning

mechanisme used in this r of the mechanical type,

wherein the movement of the button actually turn. the tun-

ing condenser to any pre -determined setting. The movement

is actuated ehro a Push -Arid, Cam, Rocker Plate and Sector

Gear, which meshes with a Scieson Gear directly fastened to

the tuning condenser .haft-(See Figures 1 and 2.) The

scissors gear preventa backlash between the sector gear and

the tuning condenser. Since the sector, gear is mounted directly on the rocker plate abaft, the position of the rocker

SPEAKER ASSEMBLIES plate will accurately determine the pouuon of the tuning (Speaker 04301.3) condenser. {1,71 Cone-Spmker cone and voice càl (L12) 1.25

The cams (Figure 2) which determine the atop points for ei,vt Speaker-Complete 4.00

each button are mounted on the push arms and are locked 3177º Tr.nsioewnr-Output traulormer (rº) I.»

in place by the locking screws and lockshoe., which press

firmly against the came when the locking screws are tightened. IMPORTANT ALIGNMENT NOTES.

to.

t Stake the generator connection to the receiver thru a shielded lead-in having not more than 50 mmf. (.00005) capa-

city with a male connector attached for connection to antenna socket. If C-2 has been changed, as outlined under ss

"Antenna Circuit," for reason of a high capacity antenna, the Dummy Antenna should be the same value as the an- m

tenna itself.go Re -adjust C-3 after installation as outlined under "Antenna Circuit" in "Service Hints."

Each step of the alignment should be repeated in its original order for greater accuracy. Always keep the output t from the generator at its lowest possible value, to prevent the A.V.C. action of the receiver from interfering with accu-

rate alignment Alignment adjustment locations are shown on the top and bottom parts location views of chassis. o.

Only the dummy antenna indicated in the chart for any particular frequency should be tided. Grid cap leads should

remain in place during alignment. C

Oscillator circuit alignment is not required in this receiver at either end of the band; the oscillator coil is pre -

adjusted for inductance in the factory.

Since the oscillator cod is unshielded, the rase has some effect on its inductance. Therefore alignment must be

done either with the chassis in the case or with a steel plate (covering the bottom of chassis), substituting for the case.

RCA MFG. Co., INC.

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SISSVHO AO 1:1d3a

Care should be used when locking screen are tightened not

to use eccessive force es the threads may become damaged

or stripped Adjustments for Push Button Tuning are very taffy made.

To adjust a push button for any cation proceed as follows:

(I) Pull the push button off the push arm.

(2) Loosen the cam locking screw one-half turn.

(3) Using the Dial Tuning Control tune in the station.

(4) Pees. the push arm in as far as it will go and ac-

curately atone «anon.

(3) With the push button still held down, tighten cam

locking drew.

(6) Replace the push button.

With the locking screw tight, the cam is locked in pou.

lion and when the button is pushed in, the cam pressure

causes the rocker plate to assume the position that tunes in

the desired station. (See Figure 2.)

Manual Turning Dial. A manual tuning knob is provided

so that additional stations may be tuned in as desired. The

manual tuning shaft is connepted ehro a cord drive to a drum

on the rocker plate shaft. This same cord drives the dial

drum by passing over a pulley on the drum shaft Figure 6

shows the complete cord dove assembly and the correct

number of turne which the cord should be wrapped around

the drive shaft and dial drum pulley Stops are provided on

the dial drum so that dial dale adjustment is made by tuning the set to the extreme ends of the band.

30762 307.1 30733

SPEAKER ASSEMBLIES (Speaker 8{351-1)

Coone-SpesksrWpkclt e and wire cuit (Lt,º)

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prising one 148 -ohm, one 32 -ohm, and one 85 -ohm section (R15, R16, R17)

Resistor -33,000 ohms-Carbon type -1 watt-(R51)-Package of 5

Resistor -56,000 ohms-Carbon type -1/4 watt-(R68)-Package of 5

Resistor -100,000 ohms-Carbon type - 1/4 watt-(R50)-Package of 5

Socket-Five-contact rectifier Radiotron socket

Switch-Low-frequency tone contrgl and power switch (S12, SIS)

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Washer-Spring washer used to hold field coil securely-Package of 5

Bracket-Tuning tube mounting bracket and clamp assembly Stock Nos. 48:58 (C505), 11248, 4748,

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RCA PAGE 9-51

MODELS 671,11,67112,6712 Voltage ,Alignment Tr immer s

RCA MFG. CO., INC.

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Figure 6-Chassis Wiring- Diagram (Model 84BT6) - OAT [p [[[w/. - w.wW -_..` MOO re.

WO ONT

05C C6

1S00KC.

O RCR MFG CO,INC. SN -710

OCT TON/ TO*

t° I. F. TRANS. CONNECTIONS

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F TRANS. CONNECTION

VII COfNC eWIONS

CAR PACK CONNECTIONS SPEAKER CONNECTIONS VISRATOR TRANS. CONNECTIONS

©John F. Riìer, Publisher


-,r

RCA MFG.

Test Oscillator

CO., INC. MODELS

Voltage,Alignment 84BT,84BT6

Order of Alignment Connection

to Receiver Dummy Antenna

Frequency Setting

Receiver Dial Setting

Circuit to Adjust

Adjustment Symbols

Adjust to Obtain

I -F Amp. Grid Cap550-750 .001 Mfd. 460 k c No Signal

kc 2nd I -F Trans. L7 and L8 Max. (peak)

2 1st Det. -Osc.

Grid Cap .001 Mfd. 460 kc No Signal 550-750 kc

1st I -F Trans. L5 and L6 Max. (peak)

3 Ant. Lead 200 Mmfd. 1,300 kc 1,500 kc "A" Osc. C6* Max. (peak)

4 Ant. Lead 200 Mmfd. 1,500 kc 1,500 kc "A" Ant. C3 Max. (peak)

* C6 is in two sections. Tighten section on bottom of gang (under chassis) for maximum capacity before adjusting top section.

Loudspeaker. -Centering of the loudspeaker is made in be replaced. This 40% difference is equivalent to a change the usual manner with three narrow paper feelers after first of approximately 25% battery voltage.

removing the front dust cover. This may be removed by Precautionary Lead Dress (Model 84BT6 only). -0 ) softening its cement with a light application of acetone, Green lead from antenna coil to antenna section of tuning using care not to allow the acetone to flow into the air condenser should be dressed as far as possible from tube gap. The dust cover should be cemented back in place No. 1 (6A7). (2) Dress brown and green twisted leads with ambroid upon completion of adjustment. (vibrator transformer T2 to vibrator socket) under capacitor

The bias cells are used C21. (3) Dress brown -black lead (T2 to C25) away from

Bias Cells (Model 84BT6 only). -The red lead which connects terminal in vibrator compartment only for the purpose of supplying bias potential and should to "SG" of tube No. 4 (42). (4) Keep all other leads in never be measured with an ordinary voltmeter or other vibrator compartment as close to chassis base as possible. device which draws any current. A simple check on the cells may be made by connecting a milliammeter in the plate Synchronous Vibrator -Rectifier (Model 84BT6 only).- circuit of the tubes biased by these cells (6A7 or 6D6, 2

The synchronous vibrator -rectifier used in the power system cells;is constructed with a plug-in base so as to be easily removed 75, 1 cell). Measure the plate current with the cells or replaced after first removing the two nuts holding the

in the circuit, then carefully remove the cells and substitute a shield can in place. Its adjustments have been accurately voltage equivalent to the rated cell voltage. If the first read- made during manufacture by means of special equipment. In ing obtained (with bias cells) is more than 40% from the cases of excessive interference or otherwise faulty operation, latter reading (with known voltage), the bias cells should a renewal should be installed.

1 t t 1/ f

(-1.BV.**) -6V. 150V.I 00 NOT {1 I I I

1 I.F.TRANS.

I I I t 1 1

¡ 66V. 2V. 1351/.¡(3V..) F0.9V.*)Ì .jam I 135VI

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SEE TEXT 7 a_.J25V

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CATHODE CURRENT

N.'S 510A.1,M4 Warta.

6AT -(-1.8V.'*)---- I

Sae TexxURC

'®( 6V.- - PLATE CURRENT

N LOP S4166. .S013. 32 ma. N.4 ssms.

(-0.9V.*) r--- -0.1V. ~

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2""'DET., A.V.c, 6D6 -50V.-- OUTPUT yA.F -75 - (-O.9V.ss)1 r 42 C'G' oo Nor wusuae -

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135V.-

1A4 66V.-- 1 OUTPUT 2we'OET..A.V.C;1--;, -- r 1F A.F - 1FS "e:D. -1.5V.

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1 (82 fß.

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L7

RCA MFG CO.INC. P-14075-0

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6606.0. ADJ.

L7

t DOTTOM VIEW- REAR OF CHASM S BOTTOM VIEW- REAR OF CNASSI3

MODEL 6451$ MODEL 13487

Figure 7-Radiotron Socket Voltages, Coil, and Trimmer Locations

Measured with all batteries at normal voltage -Tuned to approximately 1,000-kc- No signal being received -Volume control optional

Note: Two voltage values are shown for some readings. The higher value shown in parenthesis with as- *'CAUTION: Do not attempt to measure voltages on terisk (*) indicates operating conditions without volt- control grids of the 6A7, 6D6, or 75, with any conven- meter loading. The lower value is the actual measured tional voltmeter due to presence of bias cells. voltage and differs from the higher value because of the additional loading of the voltmeter through the high series circuit resistance.



4AGE 9-56 RCA

WJDELS 84BT,84BT6 Specifioations,Parts RCA MFG. CO., INC.

Frequency Range 530-1,720 kc Alignment Frequency 1,500 kc (osc., ant.)

Intermediate Frequency 460 kc

RADIOTRON COMPLEMENT (MODEL 84BT) (MODEL 84BT6) (1) RCA -106 First Detector -Oscillator (1) RCA -6A7 First Detector -Oscillator (2) RCA -1A4 . Intermediate Amplifier (2) RCA -6D6 Intermediate Amplifier (3) RCA -1F6 Second Det., A -F Amp., and A.V.C. (3) RCA -79 Second Det., A -F Amp., and A.V.C. (4) RCA -1F4 Power Output (4) RCA -42 Power Output Pilot Lamp 84BT, (1) Mazda 2.0 volts, .06 amp.; 84BT6, (1) Mazda No. 40, 6.3 volts, 0.15 amp.

BATTERIES REQUIRED

84BT...."A", one plug-in, 21/2 -volt Air Cell, or one 2 -volt storage battery; "B", three 45 -volt, heavy-duty, plug-in type B batteries; "C", one 4% -volt C battery tapped at 1% volts.

84BT6..."A", one 6 -volt storage battery; "B", none required; "C", three bias cells (Stock No. 12681).

CURRENT CONSUMPTION MODEL 84BT MODEL 84BT6 "A" at 2 volts 0.42 ampere. "A" at 6 volts 2.95 amperes "B" at 135 volts 25 ma (Supplied from vibrator) Fuse Rating 1/1 amp. 5 amps.

POWER OUTPUT Undistorted. 0.3 watt 0.5 watt Maximum 0.5 watt 0.8 watt

LOUDSPEAKER

Type: permanent -magnet dynamic Diameter: 6 inches Voice coil impedance: 21/4 ohms at 400 cycles.

STOCK DESCRIPTION STOCKNo DESCRIPTION

RECEIVER ASSEMBLIES 4629 Cap-Radiotron shield cap 12629 Capacitor -58 Mmfd. (C9)

4289 Body -Fuse connector body (Model 84BT6 only) 14262 Capacitor -110 Mmfd. (CB) 14286 Bracket -Dial lamp bracket 12404 Capacitor -120 Mmfd. (C11, C12) 14288 Cable -3 -conductor battery cable approximately 60 inches 12724 Capacitor -120 Mmfd. (C5, C16)

lone complete with fuse and battery clips (Model 12406 Capacitor -180 Mmfd. (C13) 841íT only) 14320 Capacitor -330 Mmfd. (C7, C20) (Model 84BT8 only)

12607 Cap -First I -F transformer shield cap 5107 Capacitor -.0025 Mfd. (C14) 12581 Cap. -Second I -F transformer shield cap 5005 Capacitor -.0035 Mfd. (C18) (Model 84BT only) 12118 Cap -Grid contact cap 5148 Capacitor -.007 Mfd. (C17) (Model 84BT only) 4288 Cap -Fuse connector male cap (Model 84BT6 only) 5196 Capacitor -.007 Mfd. (C17, C18) (Model 84BT8 only)

11654 Capacitor -.O1 Mfd. (C22, C23) (Model 84BT6 only) 13673 Resistor -10 megohms, carbon type, } watt (R8) (Model 4841 Capacitor -0.1 Mfd. (Model 84BT, Cl, C15) (Model 84BT only)

84BT6, Cl, C10, C24) 14315 Shield -Chassis end shield complete with bias cell holder 4840 Capacitor -0.25 Mfd. (Model 84BT, C10) (Model -For end opposite vibrator (Model 84BT6 only)

84BT8, C19) 14318 Shield -Chassis end and bottom shield for vibrator end 12741 Capacitor- 0.5 Mfd. (C21) (Model 84BT8 only) of chassis (Model 84BT6 only) 14287 Capacitor -Pack comprising two sections each 4 Mfd. 12008 Shield -First or second 1-F transformer shield can

(C7, C19) (Model 84BT only) 14317 Shield -Vibrator shield can (Model 84BT6 only) 13046 Capacitor -8 Mfd. (C25) (Model 84BT6 only) 3682 Shield -1A4, 1F8, BDB, or 75 Radiotron shield 14310 Capacitor Pack -Comprising one 10 Mfd. and two 8 14114 Socket -Dial lamp socket

Mfd. section» (C15, C28, C27) (Model 84BT6 only) 4794 Socket -4 -contact 1A4 Radiotron socket (Model 84B'í' 12681 Cell -Bias cell (Model 84BT6 only) only) 14289 Clip -2 battery clips, one marked "+" and one un-

marked 4814 Socket -5 -contact 1F4 Radiotron socket (Model 84BT

only) 14285 Coil -Antenna coil (L1, L2) 4788 Socket -8 -contact 106, 1F8, 6D8, 42, or 75 Radio - 14257 Coil -Oscillator coil (L3, L4) tron socket 12179 Coil -Vibrator choke coil (L10, L11) (Model 84BT6

only) 14312 Socket -B -contact vibrator socket, less rubber mounting

(Model 84BT8 only) 14256 Condenser -2 -gang variable tuning condenser (C2, C3,

C4, C6) 4787 Socket -7 -contact 6A7 Radiotron socket (Model 84BT8

only) 5119 Connector -3 -contact female connector for speaker cable 4284 Spring -Fuse connector spring (Model 84BT8 only)

14314 Cord -Power cord complete with fuse and clips (Model 12007 Spring -Retaining spring for core Stock No. 12008 84BT8 only) 14261 Transformer -First I -F transformer (L5, L8, CB, C9)

12006 Core -Adjustable core and stud for first or second I -F transformers

14283 Transformer -Second I -F transformer (L7, L8, C11, C12, CIS, R3, R4) (Model 84BT only)

14284 4288

Dial -Station selector dial and holder assembly Ferrule -Fuse connector ferrule and bushing (Model

14308 Transformer -Second I -F transformer (L7, L8, C11, C12, C13, R4) (Model 84BT8 only)

84ßT6 only) 14311 Transformer -Vibrator transformer (T2) (Model 84BT8 3748 Fuse -4 ampere (F1) (Model 84BT only) only) 5140 Fuse --5 ampere (F1) (Model 84BT6 only) 14309 Vibrator complete (L12) (Model 84BT8 only)

14318 Holder -Bias cell holder (2 cells) (Model 84ßT8 only) 14282 Volume control and power switch (R7, Si) (Model 14319 Holder -Bias cell holder (1 cell) (Model 84BT8 only) 84BT only) 14263 Indicator -Station selector indicator pointer 14307 Volume control and power switch (R4, Si) (Model

4290 Insulator -Fuse connector body insulator (Model 84BT8 84BT8 only) only) 4285 Washer -Fuse connector insulating washer (Model

4348 Lamp -Dial lamp (Model 84BT only) 84BT8 only) 4340 Lamp -Dial lamp (Model 84BT6 only)

14313 Mounting- Vibrator socket mounting comprising 2 rubber washers, 2 screws, 2 eyelets, 2 washers. 2 lock- washers, and 2 nuts (Model 84BT8 only)

REPRODUCER ASSEMBLIES (78474-3) (Model 84BT only)

12818 Reactor -Filter reactor (L13) (Model 84BT8 only) 14303 Cone -Reproducer cone centered in metal housing corn - 8063 Resistor -330 ohms, carbon type, } watt (R6) (Model plete with dust cap, less output transformer and plug

84BT6 only) (L9) 6031 Resistor -880 ohms, carbon type, } watt (R8, R11, 5118 Plug -3 -contact male plug for reproducer

R12) (Model 84ßT8 only) 9802 Reproducer complete 12330 Resistor -3,300 ohms, carbon type, } watt (R13) 14304 Transformer -Output transformer (TI)

(Model 84BT8 only) 11305 Resistor -22,000 ohms, carbon type, } watt (R2) REPRODUCER ASSEMBLIES (78494-2) 14284 Resistor -22,000 ohms, carbon type, 1/10 watt (R3) (Model 84BT8 only) 11384 Resistor -33,000 ohms, carbon type, } watt (R1)

(Model 84BT only) 14305 Cone -Reproducer cone complete with dust cap (L9) 12333 Resistor -68,000 ohms, carbon type, * watt (R1) 5118 Plug -3 -contact male plug for reproducer

(Model 84BT8 only) 9803 Reproducer complete 6023 Resistor -150,000 ohms, carbon type, } watt (R9) 14308 Transformer -Output transformer (T1)

(Model 84BT only) 11398 Resistor -220,000 ohms, carbon type, 1/10 watt (R4) MISCELLANEOUS ASSEMBLIES

(Model 84BT only) 11323 Resistor -270,000 ohms, carbon type, } watt (R9) 14288 Crystal -Station selector crystal 11172 Resistor -470,000 ohms, carbon type, } watt (R10) 14269 Knob -Station selector or volume control knob

3033 Resistor -1 megohm, carbon type, } watt (R8) (Model 14299 Resistor -0.88 ohm flexible wire wound ballast resistor 84BT only) (Model 84BT only)

11828 Resistor -2.2 megohms, carbon type, } watt (Model 14298 Screw -Chassis mounting screw and washer assembly 84BT, R5) (Model 84BT8, R5, R7) 14270 Spring -Retaining spring for knob Stock No. 14269

NOTE: On later production Model 84BT6, an RCA -41 output tube is used in place of the RCA -42. All circuit and speci- fication data remain the same except the "A" current consumption at 6 volts which is 2.65 amperes.



RCA PAGE 9-57

RCA MFG. Co., INC. MODEL 85BT6 Schematio,Socket TriImQers,Specs.

POWER OUTPUT BATTERY POWER A -C POWER LOUDSPEAKER Undistorted 0.85 watt 1.2 watts Type 6 -inch Permanent -magnet Dynamic Maximum 1.5 watts 2.0 watts Voice coil impedance 2.6 ohms at 400 cycles FREQUENCY RANGES R -F ALIGNMENT FREQUENCIES "Broadcast" (A) 5401,720 kc "Short Wave" (C) 15,000 kc (osc., ant.) "Short Wave" (C) 5,800-18,000 kc "Broadcast" (A) 600 kc (osc.), 1,500 kc (ow.) Intermediate Frequency 460 kc

'fee

.1ST DET $OSC. R1

CI -ANT. - 15.0001( c

CS -05C. - IS DDONC

L9 ,--- 400.4C

I.

6A86 r ,

SN --171 © P.CR MFG. CO.,INC

' 2Na DEI

A. V.G.

1 'I. E TRANS'

2^91.F.

TRAMS

C23 C11C2I

LT-O5C. 600 M C

12 OUTPUT

4 r

TI

TOP VIEW -MEAN OF CHASSIS

-----o POWER SUPPLY CONNECTOR

BOTTOM

REC

ó

Pilot Lamp (1) Mazda No. 40, 6.3 volts, 0.15 ampere POWER SUPPLY RATINGS Rating A 105.125 volts, 50-60 cycles, 45 watts Storage Battery 6 volts, 2.95 amperes Fuse Rating (Vibrator) 5 amperes

é-

d

Y1 är I ,, Figure 1-Radiotron and Trimmer Locations sê S, r- -le I -_- --1

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MODEL 85BT6 R -F Chassis Wiring RCA MFG. CO., INC.

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RCA PAGE 9-59

RCA MFG. CO., INC.

Precautionary Lead Dress.-(1) Dress brown twisted leads to power switch away from bias cell and a -f leads to volume control. (2) Dress light -blue lead, connected from 6A8 -G socket to oscillator coil, away from all other leads and chassis. (3) Dress 6A8 -G grid -cap lead (R12) to prevent shorts and keep flexible. (4) Dress all leads to antenna coil away from trimming capacitor C26 and from bus lead, connected from gscillator coil to gang condenser. (5) Dress blue antenna lead through the loop of C4 which is mounted on end of antenna coil. Do not change length of the following leads: (e) C9 to chassis; (7) Blue lead from L3 to range selector; (8) Bus lead from oscillator coil to gang condenser. Keep the following as short as possible: (9) Leads to C26; (10) Bus lead from oscillator coil to range selector. In the vibrator power -supply unit: (11) Dress small leads from transformer to vibrator socket terminals 3 and 4 close to base and twist twice. (12.) Twist large leads from transformer to vibrator socket terminals 2 and 5. (13) Dress C2 as near to bottom cover as possible.

Phonograph Attachment.-See Schematic Circuit Diagram, figure 3.

CAUTION.-Disconnect plug from a -c power source, or battery clips from storage battery, before attaching either cable -connector to the male connector on the rear of the chassis.

110 -Volt A -C Operation.-When the a -c power -supply cable -connector is attached to the male connector on the rear of the chassis; a -c power is supplied to the primary circuit of transformer T1 through terms. 3 and 7. Terms. 1

and 6 are jumpered together, in cable -connector, thereby connecting the tube heaters and dial lamp to the heater winding of Ti. Terms. 2, 4, and 5 are not used.

MODEL 85BT6 Lead Dress,Notes Tr inuner s , Voltage

6 -Volt Battery Operation.-When the vibrator power - supply unit cable -connector is attached to the male connector on the rear of the chassis, the high side of the battery (-) is connected to receiver "On -Off" switch S4 through term. 3. The other side of S4 connects to term. 4 which in turn is jumpered to term. 1, in cable connector, thereby supplying battery power to the vibrator circuit and to the tube heaters and dial lamp through term. 1. Battery ground return (+) connection is made through term. 2. "B+" voltage from vibrator is connected to the receiver filter input through term. 5. The 5Y3 -G rectifier tube circuit is inoperative fir this type of operation. Terms. 6 and 7 are not used.

Bias Cell.-The bias cell is used only for the purpose of supplying bias potential to the triode section of the 6Q7 -G tube. This cell should. never be measured with an ordinary voltmeter, or other device, which draws any current. A simple check on this cell may be made by temporarily shunting the 270,000 -ohm plate resistor R7 (mounted on 6Q7 -G socket) with a 20,000 -ohm resistor, connecting a milliammeter in the plate circuit of the 6Q7 -G tube, and noting the plate current reading. Then carefully remove the bias cell and substitute a battery potential of 0.9 -volt in its place and note the new reading of the milliammeter. If the first reading obtained (with bias cell) differs from the latter reading (with 0.9 -volt battery supply) by more than 20% of the latter reading, the bias cell should be replaced. This 20% is equivalent to a change of approximately 25% battery voltage.

OUTPUT 6K6G 182V. -

O V. J 6.4V. A.C. ----'

RECT. 5Y 3G

210V. A.C.

I ° `/ 210 V.

202V. O 1 A.C. 5V. __I

A.C.

t t

150V.

11V.

L Cal

ELECT. CAP.

ELECT. CAP C24

202V.

191V.

CII 021 C23 J

C23

C26 A-OSC.

1,5OOK C

CATHODE CURRENTS 141111 . 5.9 ma. N11.2 5.9 Re.

3ma. N4 24 ma. N".5 36 mav **CANNOT BE MEASURED

AT SOCKET

2«0. DET,A.F.,S,A.V.C. 6Q7G

6.4V. C.G.

A.C.lI +

(-0.9V.) (0 NOT

i - SEE TEXT)

URE

(82V.') I 51V.

(0V.*) -0.1V. I

. I I

t t

2"mI.F. TRANS.

LIO PRI. ADJ.

460 K C

© RCA MEG. CO. P-84193-1

1

1.6V. c- - OV.- - r - 7 `, ' C. G.

6.4V. A. C. ¡'n0 ©r 191V.- y \O 60V.--+

LST. ()ET. gosc. - 6A8G L--142V.----

LsT I. F. TRANS.

L8 PR1. ADJ. ^'0

460 KC

I.F. 6K7G ``:. C. G G.

N ,

6.4V.1 A.C.I -J I

O V.

Measured at

** CAUTION: Do not attempt to measure voltage on control grid of the 6Q7 -G with any conventional voltmeter due to presence of bias cell.

Note: Two voltage values are shown for some readings. The higher -value shown in parentheses with asterisk (*) indicates operating conditions without voltmeter loading. The lower value is the actual measured voltage and differs from the higher value because of the additional loading of the voltmeter.


Figure 2-Radiotron Socket Voltages and Trimmer Locations 115 volts, 60 -cycle supply-Values approximately 5% lower when vibrator power -supply unit is used-

Tuned to approximately 1,000 kc ("Broadcast")-No signal being received- Volume control minimum

Voltage values as specified should hold within ±20% when the receiver is normally operative at its rated line voltage. To duplicate the conditions under which the voltages were measured requires a 1,000 -ohm -per -volt d -c

meter, having ranges of 10, 50, 250 and 500 volts. Use the nearest range above the specified measured voltage. Ac voltages were measured with a corresponding a -c meter.



60 RCA

IS DEL Alignment Parts

85BT6 RCA MFG. CO.. INC.

Alignment Procedure

Calibrate the tuning dial by adjusting dial pointer to the the output of the test oscillator so that minimum signal is center horizontal line with the gang tuning -condenser plates applied to the receiver to obtain an observable output indi - in full -mesh position. This is a screw -driver adjustment. cation. This will avoid a -v -c action.

Perform alignment in proper order, tabulated below, start- The term "Dummy antenna" means the device which must ing with No. 1 and following all operations across, then No. be connected between the "high" test -oscillator output and 2, etc. Adjustment locations are shown on figures 1 and 2. the point of connection to the receiver in order to obtain

Cathode-ray alignment is preferable; the connections to ideal alignment. "No signal, 550.750 kc" means that the the chassis are shown on figure 4. If an output indicator is receiver should be tuned to a point between 550 and 750 kc used, connect it across the loudspeaker voice -coil and ad- where no signal or interference is received from a station or vance the receiver volume control to full -volume position. local (heterodyne) oscillator.

Connect the "low" output terminal of the test oscillator For further details on alignment, refer to booklet "RCA to the receiver chassis for all alignment operations. Regulate Victor Receiver Alignment."

Order of Align- ment

Test Oscillator

Range Selector


Circuit to Adjust

Adjustment Symbols

Adjust to Obtain

Connection to Receives

Dummy Antenna

Frequency Setting

6K7 -G I -F Grid CapLeft .001 Mfd. 460 kc

A., No Signal 550-750 kc

2nd I -F Trans. L10 Max. (peak)

2 6A8 -G Det. Grid Cap

00l Mfd. 460 kc "A" Left

No Signal 550-750 kc


3 An

blue)t. ad 300 Ohms 15,000 kc Right 15,000 kc "C" Osc. C8 Max. (peak)t

Ant. Lead (blue) 300 Ohms 15,000 kc

.c, Right

Rock Thrtt 15,000kc "C" Ant. Cl Max. (peak)s$

5 Ant. Lead (blue) 200 Mmfd. 600 kc

"A" Left 600 kc "A" L -F

Ose, L7 Max. (peak)

Ant. Lead (blue) 200 Mmfd. 1;500 kc "A"

Left "A" H -F

Oso. C28 Max. (peak)

Ant. Lead (blue) 200 Mmfd. 600kc "A"

Left 600kc "A" L -F Osc. L7 Max. (peak)

8 Ant. Lead

(blue) 200 Mmfd. 1,500 kc "A" Left 1,500 kc "A" H -F

Osc. C26 Max. (peak)

t Use maximum capacity peak if two peaks can be obtained. * Use minimum capacity peak if two peaks can be obtained. t After this adjustment, check for image signal by shifting receiver dial to 1.5,920 kc.

STOCK DESCRIPTION STOCKNo, DESCRIPTION

14834 14832 5237

11360 30881 14392 12408 14262 12724 12812 13699 12537 12728 14393

4839 11203 30667

12681 4358

30659 14847 14633

14631 14651 30660 14695 4340

14404 14836 14639

12818 14653 13454 30499

5175 12265 13998

8072 12454 12199 13733 12285

RECEIVER ASSEMBLIES

Belt-Variable condenser drive belt Bracket-Dial mounting bracket Bushung-Variable condenser rubber mounting bushing Cap-Grid contact cap Capacitor-Adjustable trimmer (3-30 Mmfd.) (C28) Capacitor -4.7 Mmfd. (C4) Capacitor -47 Mmfd. (C15) Capacitor -110 Mmfd. (C12, C13) Capacitor -120 Mmfd. (C8) Capacitor -450 Mmfd. (C9) Capacitor -470 Mmfd. (C17) Capacitor -560 Mmfd. (C18) Capacitor -4,500 Mmfd. (C3) Capacitor-.01 Mfd. (C10, C19, C20, C22) Capacitor -0.1 Mfd. (C5, C14, C25) Capacitor -8 Mfd. (C11) Capacitor Pack-Comprising two sections each 8 Mfd.

and one section 10 Mfd. (C21, C23, C24) Cell-Bias cell Clamp-Capacitor pack mounting clamp for Stock No.

30657 Coil-Antenna coil (LI, L2, L3, L4) Coil-Oscillator coil (L5, L6, L7) Condenser -2 -gang variable tuning condenser (C1, C2,

C6, C7) Dial-Station selector dial and holder Drive-Variable condenser vernier drive and pinion gear Holder-Bias cell holder Indicator-Station selector indicator pointer Lamp-Dial lamp Plug -7 -contact male plug for rear apron of chassis Pulley-Idler pulley-less spring Pulley-Variable condenser drive pulley-located on con-

denser shaft Reactor-Filter reactor (L13) Resistor -50 ohms, flexible type (R12) Resistor -270 ohms, carbon type, i watt (R13) Resistor -470 ohms, insulated, } watt (R8) Resistor -5,600 ohms, carbon type, } watt (R11) Resistor -6,800 ohms, insulated, i watt (R3) Resistor -22,000 ohms, insulated, I watt (R14) Resistor -33,000 ohms, carbon type, } watt (R4) Resistor -33,000 ohms, insulated, } watt (R2) Resistor -270,000 ohms, insulated, i watt (R7) Resistor -330,000 ohms, carbon type, i watt (R1) Resistor -470,000 ohms, insulated, i watt (R9)

12879 5129 4389

14638 5037

14658 11196 14837 30655 14376 14642

30658

30858

30864

30662 30663

14724 11654 4839

12484 14289 12179 12819 5140

13220 30667

30665 30686

14654 30668 12873

4119

Resistor -2.2 megohms, insulated, i watt (Re, R10) Ring-Radiotron shield ring Screw-No. 6-32 s 3/16 -inch headless set -screw for drive

pulley, Stock No. 14639 Shalt-Station selector knob shaft and pulley Shield-Radiotron shield Socket-Dial lamp socket Socket-Radiotron socket Spring-Idler pulley tension spring Switch-Range switch (Si, S2, S3) Transformer-First I.F. transformer (L8, L9, C12, C13) Transformer-Second I.F. transformer (L10, L11, C15,

C17) Transformer-Power transformer, 105-125 volts, 50-60

cycles (Ti) Volume control and power switch (R25, S4)

REPRODUCER ASSEMBLIES (84140-1)

Cone-Reproducer cone and voice coil mounted and centered in metal housing (L12)

Reproducer, complete Transformer-Output transformer (T2)

VIBRATOR POWER UNIT ASSEMBLIES Capacitor -560 Mmfd. (C7, C8) Capacitor-.01 Mfd. (C3, C4) Capacitor -0.1 Mfd. (C5, Ce) Capacitor -0.25 Mfd. (C1, C2) Clip-Battery clips for vibrator battery cable Coil-Choke coil (L1, L3) Coil-Choke coil and terminal board assembly (L4) Fuse -5 -amp. (F1) Resistor -56 ohms, carbon type, i watt (RI, R2) Socket -7 -contact female socket for vibrator to chassis

power cable Transformer-Vibrator power transformer (T1) Vibrator (L5)

MISCELLANEOUS ASSEMBLIES Escutcheon-Station selector escutcheon and crystal Cord-A.C. power cord and plug for 110 -volt operation Knob-Station selector, range switch, or volume control

knob Screw-No. 8-32 z }-inch headless cup -pointed set -screw

for knob, Stock No. 12673


RCA PAGE 9-61

L2 I.2.

RANGE BAND POSITION TSHOWN ON I

ROTATE KNOB CLOCK- WISE FOR "C 'WAND. 1sTDETB¡OSC.

352/ R18 6A7 soA

RCA MFG. CO., INC.

C4 0.1 MF

CI 2 5 MMF

RED

0 MME

C6 13-400 MM F.

6on.-8.6A 05,-12.9A

SI I

T1

J (RE D' I

POWER SW. I

I BLAC BwE N

(ON as SHAFT) L

22,000A

CIO I6 MFO.

GREEN', R17'36.000,

RECT. 1

FIELD DGREENi ÓO

L13-12906 [BROWN

S 60..7436 025,11206

OO BROWN,g BLACK

TO HEATERS DIAL LAMP

C13 0.1 MFO.

R15 RI4 27Dn IBA

DET.,A.V.C.,E,AUDIO OUTPUT 75 42

I0«I NOpp

¢ F SN _

( --- o I - RT

`27O,000Á q

CZO -.OIMFO - (ON MODEL 85E ONLY)

R13 6.8 MEG

CS¿p (CI8 WIMP'. 04 t

MFD. C

© RCA MFG. CO.. I NC. 5N-1690

MODELS 85E,U102E Schematic Chassis Wiring Transformers

41

(.OIMFD. 4 ON MODEL 85E ONLY)

T2

)e0 ( S C22

R9 47,000A

O05 MFO.

PHONO R56- 56,000n. 853 VOL.CONTR. I 3900.

C52 R50-4o0Oon TÓTAL 0.1

C5O A, _ MFD.

851 o 50

HUM NEUT. COIL

L50 400A

FA 50 F1

iCSI 551 550!1

ON MODEL U -102-E /PNONO.ON-OFF

ONLY SWITCH IIOV. 60.,, -96.36 110V. 50-60ro-72.3 A 1IOV.25.,. -105A

IF PEAK 460 KC MODEL B5E

u -102-E

TYPE 84091-1 70E -I

T2 -PRI. 520 376

T2 -SEC 0.37 0.26

LII 2.4 I.8

SPEAKER RESISTANCES

LI2 0.16 0.1

íR57 RS

YELLOW J LDE N C20 R6 SMI ELD

RECORD PLAYER CONNECTIONS TO 85E

1 I f TRANSE CONNECTIONS

SIC

C IF TRANSF CONNECTIONS

ANT COIL CONNECTIONS SSC.COIL CONNECTIONS

NEE TI GREEN -ROO

GREEN I. -111 A NEO

. wOWN HARM NED

oRoom ` ARAM

Tu V-oREEK

BROWN 712n

sñOWw.

BLUE

row 110010.Otiiúnö roA 1600 321424.0.4"'

POWER TRANSE CONNECTION§

SPEAKER CONNECTIONS

'ro _ YNIT -.113).:A TO POWERMorON iéó1ó rCN R51 "" tit n ,IÍ-,F-y¿ 'II'`b U

-2-, Sa,o00. I WPM VEN -REM MOUSES

-JL,61,r COMP Mio

-0'22W-r.= H,-e- - r E,r"LLDW_

ASO HOC.

oN EorioM O[ MOTOR sósñOwN MOoal E -toa-[ oNlTl

Figure 3-Chassis Wiring Diagram

Figure 2-Schematic Circuit Diagram

TO DIAL LPAV * E5 .M- o. THAI.

*mow. U-Iot-[

\ .7 `g0óos r VOL CONTROL 1

Ç PO WER SW. I

ONCEN

TERM. BRD.

I - ELAC

ÌwN MOEHI Esc ONL.)

RANGE SELECTOR

r7 i.79-7

S3 S2

TERM. Kr 1

..0wt.T01 M F O. (ow MODEL Ese

LEGT. He HRH

Cott

...n OUTIIIT J! O 4

CMO

RIO RIT 090000* 5.000.

TEEM. ERE),

CIE 01.

UL

RECT. ED

C 9 .romI Fo. E Rao

SLACK

RIS O.A[c

trog

ELECT. CA P.

Cla

APE

Iñ LW

rx

uxln

0Rc

POWER TRAMSFORMER TI

R12 o 'mow 2

014

R

RM RD.

0.I

TELLO

wlá

000.

IMP

Cl CE

SANO CONE

LI

POWER CORD

'4004

LI

YELLOW

LT

MIKA

LS

AL:

LI Le_ Ose. COIL

ION moo P

IOlS Y I \`^L

ERO

ANT. COIL E I OCT {OEC.

SAT

e900c12

IR LI TRANS r -_

1>00000.

.SLUE

I I 1

C. F.

'DS f`oI.I. .TMNE.T Cl

Nco

D 0. SO

o

ADJ ä

b \\

KACK

SLUE

PHONO. VOL. HACK W0. CONTROL i

MO CATMOO

00v I10CILL00RA00

I rÓ1006 I nNr14t'Ö TO CwwAls '"`"

PHONO- RADIO SWITCH

EOR Aw010 LIOER W CONTACTSA



62 RCA MODELS 85E,TJ102E

255V I

( lGv*) -0.4V.

-Z40V -r©® J Cr - W 4

6.4 Y.

A.G. L__ _

360V.- - - A.C.-

Socket,Triamers Voltage,Speos. Pick up,Motcr Derails

LOUDSPEAKER

Type, Electrodynamic Impedance (v.c.) at 400 cycles

Type of Pickup Pickup Impedance

ALIGN ARMATURE CENTRALLY BETWEEN

POLE PIECE

wELDED

POLE PIECES

SOLDER

RCA MFG. CO., INC.

VISCOLOu7

85E U -102E DAMPING

6 -inch 12 -inch 2.6 ohms.. 2.2 ohms

SPACER CUSHIONS

ADJUST 3TT/rcN r0 MP WHEN NEEDLE It ON I% I t RAD. FROM g or MOTOR SPINDLE.

High -impedance magnetic TIP OR SOLDENG IRO

RI ARMATURE sK

1,400 ohms at 1,000 cycles p ^" "' ̀° ' V ISCOLOID

DRMFING B

C SNPTRÑ G NSRTe

NEEDLE HOLDING SCREW

Figure 1-Details of Pickup

SPEED ADJUSTMENT (SCREW) TO DECREASE SPEED

TURN CLOCKWISE

TURN SPEED ADJUSTER 30 THE FEL WILL PROTRUDE h -WHEN ALL THE WAY IN. ADJUST GOVERNOR SO AS TO LEAVE yl E- BETWEEN FELT AND DISC, THEN SECURE DV MEANS OF GOVERNOR SCRE

ADJUST 30 THAT SHAFT IS FREE TO ROTATE WITHOUT ENO PLAY

REMOVE TO TAKE OFF GOVERNOR

OIL KEEP FILLED WITH LIGHT OIL TO INSURE SMOOTH OPERATION

Figure 6-Details of Motor

DO NOT CMANOE THIS ADJUSTMENT

pSC. MRS CO.IKC M -E1414-°

Figure 4-Special Soldering -Iron Tip 7N -1291G

TONE ARM ADJ. SCREW

`AOJYSr SET 3CREW6 LOCKNUT ON

MCRW' ARM SO AS TO HAYE vI$ PROM

MOTOR JOARO TO THE PULL TON«

NEEDLE PROPERLY INSERTED IN /ICH UP

Figure 5-Tone Arm and Motor Switch Adjustments

© RCA MFG. CO., I NC. SN -7ßi

POWER TRANS.

TI

4 OUTPUT

TOP FRONT OF CHASSIS

L6-0SC (ADJ. AT REAR GOO I.( .0 OF CHASSIS)

ITRANS

IJJJJJF

nI,

DET A.V.C.

AUDIO 05C

Cnp 7 AN /

/

CS-OSC. C1 -ANT. 15,000 K.C. 15,000K.C.

Rie sort.

2 TO TERM.

SEC. ADJ. il5 460K. C.

1ST DET.

Figure 7-Radiofron, Coil, and Trimmer Locations

OUTPUT 42.

RECT. 80

5.0 7

V.

A.C. , 3'50V

L © RCA MFG.CO.,INC.

SN -749

330V.

ELECT. CRP C24

C23

1-

205V

CIQII

J e-LCCT. CRP. } - CIO

CIO -ces

¡ C.G.;..

255V {

(-0.9v91 -0.2IV. i L6.4

V.

I A.C. I 100V. f t`

CATHODE CURRENTS N. 1 toma.

N° 3 0.32011 N° 4 4oma. N°5 mPmago **CANNOT BE MEASURED

AT SOCKET

2"O DET., A.V.C.eAUDIO

75

tI

I r- I * 6.4 V.

I L ( A.C.

cG'_ (_3.9v9 - -0.2V

L164 t ^ -255V -- 1ST DET. $ osc. 6A7

PRI. AOJ.

-0.1V.

I 2"D.I.F.TRANS.

- 82V.-

PRI. ADJ.

t. TRAN S.

-Bay. --- I.F.

606

I

C.G. L6.4 V X

A.c. (-3.9V*)

t BOTTOM VIEW- REAR OF CHASSIS

Figure 8-Radiotron Socket Volt ages, Coil, and Trimmer Locations

Measured at 115 volts, 60 -cycle supply-Tuned to approximately 1,000 kc ("Broadcast")- No signal being received-Volume control minimum

Note: Two voltage vainds are shown for some readings. The value shown in parentheses with asterisk (*) indicates operating conditions without voltmeter loading. The other value (generally lower) is the actual measured voltage and differs from the value shown in parentheses because of the additional loading of the voltmeter through the high series circuit resistance.

Voltage values as- specified should hold within ±20% when the receiver is normally operative at its rated line voltage. To duplicate the conditions under which the voltages were measured requires a 1,000 -ohm -per -volt d -c meter, having ranges of 10, 50, 250, and 500 volts. Use the nearest range above the specified measured voltage. A -c voltages were measured with a corresponding a -c meter.



RCA PAGE 9- s

aaaaa m aa a66666g66

8ó'282 r.

RCA MFG. CO., INC. MODELS 85E,í 102E

Lead r ess,Alignment Pick-uup,Motor Notes Specs. ,Parts

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)'AGE 9-64 RCA

MJDELS 86T3,87T1 Alignment,Parts

RCA MFG. CO., INC.

Alignment Procedure With the gang tuning -condenser plates in full -mesh posi-

tion, adjust the pointer to the low -frequency (end) calibration mark on the dial scale. The pointer is soldered in place on the drive cable.

Perform alignment in proper order, tabulated below, starting with No. 1 and following all operations across, then No. 2, etc. Adjustment locations are shown on figures 1 and 2.

Cathode-ray alignment is preferable; the connections to the chassis are shown on figure 4. If an output indicator is used, connect it across the loudspeaker voice -coil and advance the receiver volume control to full -volume position.

Connect the low" output terminal of the test oscillator to the receiver "G" (ground) terminal for all alignment opera-

tions. Regulate the output of the test oscillator so that minimum signal is applied to the receiver to obtain an observable output indication. This will avoid a -v -c action.

The term "Dummy antenna" means the device which must be connected between the "high" test -oscillator output and the point of connection to the receiver in order to obtain ideal alignment. "No signal, 550-750 kc" means that the receiver should be tuned to a point between 550 and 750 kc where no signal or interference is received from a station or local (heterodyne) oscillator.

For further details on alignment, refer to booklet "RCA Victor Receiver Alignment."


Test Oscillator

Range Selector


Circuit to Adjust

Adjustment Symbols

Adjust to Obtain

Connection to Receiver

Dummy Antenna

Frequency Setting

l 6K7 I -F Grid Cap550-750 001 Mfd. 460 kc "A" Left No Signal

kc 2nd I -F Trans. L12 and L13 Max (peak)

2 6A8 Det. Grid Cap

.001 Mfd. 460 kc "A No Signal 550-750 kc


3 Ant. Term. 300 Ohms 6,000 kc "B" Center 6,000 kc "B" Osc. C11 Max. (peak)* 4 Ant. Term. 300 Ohms 6,000 kc "B" 6,000 kc "B" Ant. C2 Max. (peak)t 5 Ant. Term. 300 Ohms 20,000 kc "C" Right 20,000 kc "C" Osc. C7 Max. (peak)$ 6 Ant. Term. 200 Mmfd. 600 kc "A" Left 600 kc "A" L -F Osc. L8 Max. (peak) 7 Ant. Term. 200 Mmfd. 1,500 kc "A" 1,500 kc "A" H -F Ose. C10 Max (peak) 8 Ant. Term. 200 Mmfd. 600 kc "A" 600 kc "A" L -F Osc. L8 Max. (peak) 9 Ant. Term. 200 Mmfd. 1,500 kc "A" 1,500 kc "A" H -F Ose. C10 Max. (peak)

* Use minimum capacity peak if two peaks can be obtained. t After this adjustment, check for image signal bÿ shifting receiver dial to 5,080 kc. $ Use maximum capacity peak if two peaks can be obtained. After this adjustment, check for image signal by shifting receiver dial to 20,920 kc. Note that the heterodyne oscillator tracks above the signal frequency on bands "A" and "B," and below the signal frequency on band "C."

STOCK No. DESCRIPTION STOCK

No. DESCRIPTION

14380

14352 13216 12717 12607 12581 11310 12723 14262 12404 12406 12488 30433 30592 30303

4838 14393

4870

4839 12484 11203 30577

5212 4358

30578 30579 30573 30580

30586 12800 12006 30589 30581 30572

30584 30583

5228 30587 14636 14525 30590 14653 30591 11298 14559 30151

14284 12454 11323

RECEIVER ASSEMBLIES

Arm -Hub and arm for operating band indicator shutter -fastens on range switch shaft

Belt -Station selector drive belt Board -Antenna and ground terminal board Board -Phonograph terminal board Cap -Top shield cap for first 1.F. transformer Cap -Top shield cap for second I.F. transformer Cap -Grid contact cap Capautor-58 Mmfd. (C5) Capacitor -110 Mmfd. (C14, C15) Capacitor -120 Mmfd. (C27, C28) Capacitor -180 Mmfd. (C19) Capacitor -270 Mmfd. (C21) Capacitor -470 Mmfd. (C4, C9) Capacitor -1,600 Mmfd. (C8) Capautor-.0035 Mfd. (C1) Capacitor -.005 Mfd. (C23, C31) Capacitor -.01 Mfd. (C20, C22) Capacitor -.025 Mfd. (C30, C40) (C40 - Model 87T1

only) Capacitor -0.1 Mfd. (C16, C17) Capacitor ---0.25 Mfd. (C13) Capacitor -10 Mfd. (C12) Capacitor Pack -Comprising two sections each 10 Mfd.

(C24, C26) Capacitor -16 Mfd. (C25) Clamp -Mounting clamp for capacitor pack, Stock No.

30577 Coil -Antenna coil (L1, L2, L3) Coil -Oscillator coil (L4, L5, Le, L7, L8, L9) Condenser -2 -gang variable tuning condenser (C2, CS, C6) Condenser -S -gang mica trimmer -two sections each 2-10

Mmfd., one section 3-30 Mmfd. (C7, C10, C11) Cord -Station -selector indicator pointer cord Core -Adjustable core and stud for oscillator coil Core -Adjustable core and stud for I.F. transformer Dial -Station -selector dial scale Disc -Band indicator disc with celluloid window Drive -Vernier drive shaft and pinion gear for variable

condenser Drum -Station -selector drive -cord drum with set screws Indicator -Station -selector indicator pointer a n d holder

assembly Lamp -Dial lamp Pulley -Drive -belt pulley for condenser shaft Pulley -Drive -belt idler pulley Resistor -22 ohms, carbon type, } watt (R13) Resistor -39 ohms, carbon type, } watt (R19) Resistor -50 ohms, flexible type, 1/10 watt (R20) Resistor -220 ohms, insulated wire wound, 1.1 watt (R12) Resistor -5,600 ohms, carbon type, 1 watt (R5) Resistor -10,000 ohms, insulated, } watt (R17) Resistor -18,000 ohms, insulated, 1 watt (R3, R32) (R32

-Model 87T1 only) Resistor -22,000 ohms, carbon type, 1/10 watt (R7) Resistor -33,000 ohms, insulated, } watt (Rl) Resistor -270,000 ohms, carbon type, } watt (R10)

13005 11452 12013

12679 11626

30582 14343 14350

14340

12008 11196 14114 13871

12007 30585 30588 30578 30574 14376 14308

30571

30617

30575

14614

14934

14613

14615

14935

30595

30593

30594

14359 14289 14287 14270

4982

Resistor -390,000 ohms, carbon type, 1/10 watt (R11) Resistor -470,000 ohms, carbon type, 1/10 watt (R2) Resistor -1 meg., carbon type, 1/10 watt (R31) (Model

87T1 only) Resistor -2.2 meg., insulated, } watt (R4, R9) Resistor -2.2 meg., carbon type, } watt (R30) (Model

87T1 only) Retainer -Band -indicator disc retainer Ring -Retaining ring for range switch shaft Screw -No. 8-32 x 8/16 in, square -head set screw for

drum, Stock' No. 30584, arm, Stock No. 14380, and pulley, Stock No. 30587

Shaft -Drive pulley and knob shaft -fastens on range switch shaft

Shield-I.F. transformer shield can Socket -8 -contact Radiotron socket Socket -Dial -lamp socket. Socket -Tuning -tube socket complete -lesa cable (Model

6711 only) Spring -Retaining spring for core, Stock No. 12006 Spring -Tension spring for pointer cord Spring -Tension spring for idler pulley Switch -Range switch (SI, S2) Tone control and power switch (R18, S4) Transformer -First I.F. transformer (L10, L11, C14, C15) Transformer -Second I.F. transformer (L12, L13, C19,

C27, C28, R7) Transformer -Power transformer, 105-125 volts, 25-60

cycle (T1) Transformer -Power transformer, 105-125 and 200-250

volts, 50.80 cycle (T1) Volume Control (R8)

REPRODUCER ASSEMBLIES

Cone -Reproducer cone and dust cap (for speaker marked 84091-1 or 84001-3) (Lie)

Cone -Reproducer cone and dust cap (for speaker marked 84091-2 or 84001-8) (L14)

Reproducer complete (marked 84001-S or 6 but inter- changeable with speaker marked 84091-1 or 2)

Transformer -Output transformer (for speaker marked 84091-1 or 84001-3) (T2)

Transformer -Output transformer (for speaker marked 84091-2 or 84001-6) (T2)

MISCELLANEOUS ASSEMBLIES

Bracket -Tuning -tube mounting bracket and clip (Model 87T1 only)

Escutcheon -Dial escutcheon and crystal (Model 86T3 only)

Escutcheon -Dial and tuning -tube escutcheon and crystal (Model 87T1 only)

Knob -Station selector knob Knob -Tone control, volume control, or range switch knob Screw -Chassis -mounting screw and washer assembly Spring -Retaining spring for knob, Stock No. 14269 Spring -Retaining spring for knob. Stock No. 14359

E ro

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RCA PAGE 9-65

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O

RCA MFG. CO., INC.

POWER OUTPUT

Undistorted Maximum LOUDSPEAKER

Type

V.C. Impedance

2.2 watts 4.5 watts

6 -inch Electrodynamic 4 84091-1

2.6 ohms at 400 cycles 84001-3 84091-2

4.7 ohms at 400 cycles 84001-6

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M)DELS 86T3,87T1 Chassis Wiring Voltage,Trimmers RCA MFG. CO., INC.

" t ? 350V. I

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350V. 5W4A.C. '

5V ©33 A.

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OUTPUT 6F6

Note: Two voltage values are shown for some readings. The value shown in parentheses with asterisk (') indicates operating conditions without voltmeter loading. The other value (generally lower) is the achtal measured voltage and differs from the value shown in parentheses because of the additional loading of the voltmeter through the high series circuit resistance.

©RCA MFG.. CO. INC. T-70875-0

t ''

1 i( -36V.. )1 j ¡ -16.4V.

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L10

L12. PR, er''''fADJ.

460 KC

BOTTOM VIEW -REAR OF CHASSIS Measured at 115 volts, 60 -cycle supply-Tuned to approximately 1,000 kc ("Standard Broadcast")-

No signal being received-Volume control minimum --Tone control optional

OUTPUT 6F6

TONE CONTROL

POWER 5w.

R18

L8 L4A,B

L4

RED

AUDIO

6F5

RANG

SELECTOR

S1 -S2 -S3

< C12 . C26)

CIL C26

ELECT BROWN -

CAP


FOR PHONO. -

1"DET.FOSC. 6A6

ELECT. CRP.

PET AV C 6H6

WLUME-CONTROL

ELECT. CAP

C25

r, LE TRANS.

FOR MODEL 87T -I ONLY

2FOR MODEL 87T -I ONLY

z I

2"11.IF TRANS

PHONO. TERM. BAD.

OPEN LINK 3 z/ 1 CATHODE RAY OSCILLOGRAPH CONN.

{VERTICAL -H( TO THIS TERM. VERTICAL 21- TO CHASSIS II

RCA PAGE 9-67

e

RCA MFG. CO.. INC.

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RCA PAGE 9-6v

OUTPUT ' L 6,3v.-.1

42 A. C.

RCAMFG_CO.,INC.

RCA 3111G. CO., INC.

The various diagrams of this booklet contain such information as will be needed to isolate causes for defective operation if such develops. The ratings of the resistors, capacitors, coils, etc., are indicated adjacent to the symbols' signifying these parts on the diagrams Identification titles such as R1, Ll, Cl, etc., provide reference between the illustrations and Replacement Parts List. The coils, transformer windings, and reactors are rated in terms of d -c resistance to permit continuity checks.

Precautionary Lead Dress.-Keep the following leads as short as possible: (1) Bus lead from C16 to S2, (2) bus lead from L8 to S2, (3) leads from C24 to L8 and to chassis. (4) Bus lead from L5 to S2 should be 21/2 inches long between lugs .and dressed away from S2, (5) bus lead from C17 to S2 should be dressed away from adjacent parts, (6) leads should be dressed away from grid lug of 42 tube, (7) Cll lead to L5 should be 1 inch long and dressed between L5 and C4, C11 lead to ground should be short, (8) green lead between opposite lugs on S2 should be dressed away from S2, (9) excess antenna lead should be dressed above chassis, (10) blue lead from L7 to 6A7 oscillator plate lug should be dressed down and away from L8

lug and away from oscillator grid of 6A7, (11) green lead from L6 to S2 should be dressed away from bus connected between C17 and S2, (12) red lead from L6 tap to S2 should be dressed away from bus connected between C17 and S2. When necessary to replace bus leads, use only wire having same diameter as original.

Phonograph Attachment.-A terminal board is provided for connecting a phonograph into the audio amplifying circuit. RCA Victor Models R-93, R -93-A, R-93-2, or R-94 Record Players should be connected as follows: Remove link between terminals 1 and 2 on terminal board. Connect green wire in Radio -Record switch cable to terminal 1, yellow to terminal 2, and shield extension to terminal 3. Tape unused red and blue leads separately. Connect a 2 -conductor twisted

MODELS 86T4,86T44 Socket,Trimmers Lead Dress,Voltage Notes

cable between the Record Player binding posts and the screw terminals on Radio -Record switch.

Loudspeaker.-Centering of the loudspeaker is made in the usual manner with three narrow paper feelers after first removing the front dust cover. This may be removed by softening its cement with a light application of acetone, using care that the acetone does not flow into the air gap.

Speakers RL -63F-1 and $4091.1 have screws for the cen-

tering adjustment, while on speaker 84091-2, it is necessary to separate the glued centering disc from the housing, insert paper feelers in air gap, then apply cement to the centering disc, press down firmly, and leave the feelers in place until the cement dries. The dust cover should be cemented back in place with ambroid after completion of the adjustment.

'C`OSC.C23 20,0001C.C.

OET. p2 TUNING TUBE .6 20,000 H. C.

4 1

AU010 OUTPUT

\\ LI\ \

/ \

RECTIFIER/

)

f RCAMFO.CO 15C. li COIL

151 a K Y - WAVE TRAP \ 'A' 05C LII (TOP REAR OF CHASSIS,' -A-DET. C15 460 KC. LI \\IT5HC. 1350 A.0 .

'A' ANT. C6 VA -05C. C29 35014C. 350 14.C.

/WANT. C4 'A'OSC.L10 i1500H.C. 600H.C. / -A"06C.C2S , 'A DET. C13 1500H.C. /1530H.C.

2DET nu010(6

O5C COIL

L16 601(11

Figure 1-Radiotron, Coil, and Trimmer Locations

CATNODE CO@NTS

(1) tCA-4A9 n.4 NA.

ut RCA -5A 115tt MA

a) ACA-1t O11.501A

(4) RCA -4t 35 MA

(5) RCA -t0 I N IIA.

(5) RCA -645 CAMA.

CA5 NOT AC MAAM1tC0 T AOCNAT

t f I Rao R21 Rn I O5C COILl

L=16V.=1J v f `* x 1 r -1.35V :RES. ASSEMBLY

I

C413

--350V.-A.C. -r-7700V.-A.C. RECT.

80

5V. A.C.

- 330V.-- -

(-t6V.e

EL. CAP.

05C. C01 L

(-3.2V.4) - D.4v (. -

LC. G.

DET.

()ET. COI L

ANT. COIL.

2ASV. > v A e 7C

-235V.- P 4vß\ Q TONE CONTROL

POWER SW.

A.C.

49

EL. CAR.

249V.

1-'(112V.4)__ 100V.

--155 V. - --- 4.05C. L___ _-1-22.4V'I- SAT (-7 V.)

BLACK- BROWN TR BLACK

TUNING UBE CABLE

DET. COIL BLOCK-GREENTR. ... ... BLACK- RED TR.

VOLUME CONTROL

BOTTOM FRONT OF CHASSIS

C.G.

rti (-1.35V.') -0.5V.

v

lAT I.F. TRANS.

PRI. 0.34.) 1 _o I

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P-T299A-1

Figure 2-Radiotron Socket Voltages, Coil, and Trimmer Locations Measured at 115 volts, 60 -cycle supply-Tuned to approximately 1,000 kc or 300 meters band-

No signal being received-Volume control minimum

Note: Two voltage values are shown for some readings. The value shown in parentheses with asterisk (') indicates operating conditions without voltmeter loading. The other value (generally lower) is the actual measured voltage and differs from the value shown in parentheses because of the additional loading of the voltmeter through the high series circuit resistance.

114 60Á.0

Voltage values as specified should hold within ±20% when the receiver is normally operative at its rated line voltage. To duplicate the conditions under which the voltages were measured requires a 1,000 -ohm -per -volt d -c meter, having ranges of 10, 50, 250 and 500 volts. Use the nearest range above the specified measured voltage. A -c voltages were measured with a corresponding a -c meter. -



70 RCA MODELS 86T4,86T44 Alignment ,Parts RCA MFG. CO., INC.

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H('A PAGE 9-73

RCA MFG. CO., INC.

Adjustments for Electric Tuning Each pushbutton connects a particular oscillator coil and

antenna trimmer condenser. The tuning of this coil and this condenser selects a station. Clockwise rotation of cores or trimmer screws lowers frequency.

The frequency ranges ford arious push -buttons are: No. 1 540 to 1,160 kc - Adjust L-20 and C-40. No. 2 540 to 1,160 kc - Adjust L-21 and C-41. No. 3 600 to 1,265 kc - Adjust L-22 and C-42. No. 4 600 to 1,265 kc - Adjust L-23 and C-43. No. 5 785 to 1,550 kc - Adjust L-24 and C-44. No. 6 785 to 1,550 kc - Adjust L-25 and C-45.

The following are the steps in aligning a push-button selector:

Begin at low -frequency end of band, and tune selected stations in. the order that they would come on dial. Use one or two feet of wire as an antenna to ensure sharp peaking.

(1) Manually tune to desired station, then turn range selector to "Electric Tuning."

(2) Press a push-button whose frequency range includes the station.

(3) Adjust oscillator coil corresponding to that push- button, to receive the desired station. Screw core all

(4)

(5)

MODEL 86T6 Voltage ,Trimmers Tuner

the way in, to lowest frequency, then unscrew slowly until station is found. Adjust antenna condenser for that push-button, to receive the desired station with maximum volume. Check alignment by switching to manual tuning: Reception will not change appreciably if alignment is correct.

(6) Make a final careful adjustment of all magnetite cores and trimmers.


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Test Oscillator

Range Selector


Circuit to Adjust

Adjustment Symbols

Adjust to Obtain


Dummy Antenna

Frequency Setting

1 6K7 I -F Grid Cap

.001 Mfd. 455 kc "A" Left No Signal 550-750 kc

2nd I -F Trans. L12 and L13 Max. (peak)

2 6A8 Det. Grid Cap

.001 Mfd. 455 kc "A" No Signal 550-750 kc


3 Ant. Term. 300 Ohms 6,000 kc "B" Center 6.0 mc "B" Osc. C11 Max. (peak)* 4 Ant. Term. 300 Ohms 6,000 kc "B" 6.0 mc "B" Ant. C2 Max. (peak)t 5 Ant. Term. 300 Ohms 20,000 kc "C" Right 20.0 mc "C" Osc. C7 Max. (peak)t 6 Ant. Term. 200 Mmfd. 600 kc "A" 600 kc "A" L -F Osc. L8 Max. (peak) 7 Ant. Term. 200 Mmfd. 1,500 kc "A" 1,500 kc "A" H -F Osc. C10 Max. (peak) 8 Ant. Term. 200 Mmfd. 600 kc "A" 600 kc "A" L -F Osc. L8 Max. (peak) 9 Ant. Term. 200 Mmfd. 1,500kc "A" 1,500kc "A" WF Osc. C10 Max. (peak)

10 Set up electric tuning as outlined under "Adjustments for Electric Tuning."

* Use minimum capacity peak if two peaks can be obtained. t After this adjustment, check for image signal by shifting receiver dial to 5.09 mc. $ Use maximum capacity peak if two peaks can be obtained. After this adjustment, check for image signal

by shifting receiver dial to 20.91 mc. Note that the heterodyne oscillator tracks above the signal frequency on bands "A" and "B," and below the signal frequency on band "C."

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POWER OUTPUT

MDDEL 86X4 Schematio,Socket Trimmer s, Spec s.

Undistorted 1.6 watts Maximum 2.75 watts LOUDSPEAKER <

Type 6 -inch Permanent -Magnet Dynamic m z

Impedance (V.0 ) 2 4 ohms at 400 cycles ñ 2

Pilot Lamp (1) ....... Mazda No. 40, 6.3 volts,, 0.15 amp.

Height 101/2 inches Width . ... 141%g inches ^^ Depth . .. 7% inches E

Weight (Net) ... 141/2 pounds É 4)

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RCA PAGE 9-77

Phono. Attachment MODEL 86X4

RCA MFG. CO., INC. Alignment Data

Lead Dress

Alignment Procedure Calibrate the tuning dial by adjusting dial pointer to the The term "Dummy antenna" means the device which must

center horizontal line with the gang tuning -condenser plates be connected between the "high" test -oscillator output and in full -mesh position. This is a screw -driver adjustment. the point of connection to the receiver in order to obtain

Perform alignment in proper order, tabulated below, start- ideal alignment. "No signal, 550.750 kc" means that the ing with No. 1 and following all operations across, then No. receiver should be tuned to a point between 550 and 750 kc

2, etc. Adjustment locations are shown on figures L and 2. (400-550 meters) where no signal or interference is received Cathode-ray alignment is highly preferable; the connec- from a station or local (heterodyne) oscillator.

tions to the chassis are shown on figure 4. If an output indi- Conversion of kilocycles (kc) to meters for alignment cator is used, connect it across the loudspeaker voice -coil and frequencies is as follows: 15,000 kc (20 mc) = 20 meters; advance the receiver volume control to full -volume position. 1,500 kc = 200 meters; 600 kc - 500 meters; 460 kc =

Connect the "low" output terminal of the test oscillator 652 meters; 353 kc - 850 meters; and 166.7 kc = 1,800 to the receiver chassis for all alignment operations. Regulate meters. the output of the test oscillator so that minimum signal is

applied to the receiver to obtain an observable output indi- For further details on alignment, refer to booklet "RCA This avoid a -v -c action. Victor Receiver Alignment." cation. will

Order of Test Oscillator Receiver Circuit Adjustment Adjust to

Align- meet Connection


Frequency Setting

Range Selector Dial Setting

to Adjust Symbols Obtain 1550-750 6D6 I -F

Grid Cap ,001 Mfd. 460 kc

«A»r

Center No Signal

kc (400-5601 meters)

2nd I -F

Trans. L13 and L14 Max. (peak)

2 6A8 Det. Grid Cap .001 Mfd. 460 kc "A"

Center No Signa l 550-750 kc

(400-550 meters) 1st I -F Trans. L11 and L12 Max. (peak)

3 Ant. Lead

(blue) o,., Ohms 15,000 kc

(20 meters) i.c"

Right 16 mc "C" Osc. C25 Max. (peak)t

Ant. Lead (blue) 300 Ohms 15,000 kc

(20 meters) "C"

Right Rock Through

15 mc "C" Ant. C7 Max. (peak)*

5 Ant. Lead

(blue) 200 Mmfd. 600kc (500 meters)

"A" Center

600kc (500 meters)

"A" L -F Ose. L9 Max. (peak)t

6 Ant. Lead

(blue) . 200 Mmfd. 1,500 kc (200 meters)

"A" Center

1,500 kc (200 meters)

"A" H -F Osc. Max. (peak)

7 Ant. Lead (blue) 200 Mmfd. 600kc

(500 meters) "A"

Center 600 kc

(500 meters) "A" L -F

Ose. L9 Max. (peak)

8 Ant. Lead

(blue) 200 Mmfd. 1,500 kc (200 meters)

"A" Center

1,b00 kc (200 meters)

"A" H -F Osc. C24 Max, (peak)

9 Ant. Lead

(blue) 200 Mmfd. 166.7 kc

(1,800 meters) "X" Left

166.7 kc (1,800 meters)

"X" L -F Osc.

L10 Max. (peak)

10 Ant. Lead

(blue) 200 Mmfd. ` kc

(850 meters) "X" Left

353 kc (850 meters)

"X" H -F Osc. C28 Max. (peak)

11 Ant. Lead

(blue) 200 Mmfd. 166.7 kc (1,800 meters)

"X" Left

166.7 kc (1,800 meters)

"X" L -F Osc. L10 Max. (peak)

12 Ant. Lead

(blue) 200 Mmfd. 353 kc (850 meters)

"X" Left

363 kc (850 meters).

r`X" H -F Osc. C28 Max. (peak)

t Use maximum capacity peak if two peaks can be obtained. * Use minimum capacity peak if two peaks can be obtained. After this adjustment, check for image signal

by shifting receiver dial to 15,920 kc. $ "X" H -F Osc. trimmer C28 must be at least three turns out during this adjustment.

Precautionary Lead Dress.-(1) All bus leads in r -f assembly should be kept as short as possible. When necessary Phonograph Attachment.-A terminal board is provided

to replace bus leads, use only wire having same diameter. for connecting a phonograph into the audio amplifying

(2) Dress capacitor, connected from tone -control switch to circuit. RCA Victor Models R-93, R -93-A, R-93-2, or R-94

terminal board, away from capacitor, connected to center Record Players should be connected as follows: Open link

terminal of volume control, and away from exposed green between terminals 1 and 2 on terminal board. Connect green

shielded lead running to phono. term. board.- (3) Dress wire in Radio -Record switch cable to terminal 1, yellow to

green lead, connected from volume control -to 2nd i -f trans- terminal 2, and shield extension to terminal 3. Tape unused

former, as close to chassis as possible. (4) Dress capacitor, red and blue leads separately. Connect a 2 -conductor twisted

connected from 25L6 socket to red lug on electrolytic- cable between the Record Player binding posts and the screw

capacitor, away from phono. term. board. (5) Brown and terminals on Radio Record switch.

green leads from speaker must be twisted, dressed along CAUTION: Disconnect receiver power cord before making chassis and away from exposed green shielded lead and lug phonograph connections. Tape shield extension on Radio - running to phono. term. board. (6) Dress green lead, con- Record cable so it cannot make metallic connection with re- nected between 6A8 and 6D6 sockets, away from, pin No. 5 ceiver chassis ground. of 6A8 socket.



LAGE 9-78 RCA MODEL 86X4 Voltage ,Trimmers Parts

RCA MFG. CO., INC.

Figure 2-Radiotron Socket Voltages. Coil, and Trimmer Locations ?

RECT. 2525

25V.

rA.c A.C.-L° ,

's1*»- 135K1A _ 65d. LINE VOLTAGE

+ A.C. /ISV:A.O.

4V. I

A.C.

125V.

.C.

R

130V,

ELECT. CAP. C35

REO L¡BLACK

115V. A.C.

2601<1A LINE VOLTAGE: A.C. a30 V-A.C.

230V. j A.C.

I

/

CATHODE CURRENTS NL 1 .... 5 0 ma. Net soma. N..3.... 0.2ma. N114 48 ma. N^.5 ...64 ma.

OUTPUT 25L6

®( 25V. Q

I l

#-}'-

I

A.C.

1118V.

1

I J I 7.5V.

I 112V. I tt i i

ELECT. CAP.

C36 C36.C32

OV.

A.F, 244OET. aIA.V.CF 6qT G

r a63V. (40V.a A.C. I 21V.

f a I 2.6V.

(1.oV.*) I r}isTOET.

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16.3V I A.C.

L 1181/4/.--

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C.G..,\s> 8 V. -2.5V -"

lsr. I. F. TRANS F

1.11 I

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L13 IFDo, rI

. r 4601LC. I 1, (1.OV.*)rI.F

OV. 1_6.3V.606

r -118V. ---.-

- 50V.-

(1.OV.9 1.0V. Ì

A.C. OV. 1 I

I I

t

3.7 V. -

©RCA MFG.CO.INC. P -84185-t

Measured at 230 volts, 60 cycle supply; or 115 volts, 60 cycle supply-For 230 volts d -c, voltages are same-For 115 volts d -c, all voltages except line and heaters about 20% lower-Tuned to approximately 1,000 kc (300 meters) "Medium Wave"-No signal being received-Volume control minimum-Tone control optional.

Note: Two voltage values are shown for some readings. The value shown in parentheses with asterisk (6) indicates operating conditions without voltmeter loading. The other value (generally lower) is the actual measured voltage and differs from the value shown in parentheses because of the additional looking of the voltmeter through the high series circuit resistance.

14634 14632 5237

11350 30295 15200 14262 12404 127.24 12406 12694 30302 30303 30304

4858 14393 11315

4886 14626

4839 12484

4840 30298

30297 30292

30293 30294 30296 14633

14648 12864 12006 30289

30397

14651 30290

4340 14638 14639

14641 30300

MI -8115

RECEIVER ASSEMBLIES Belt-Variable condenser drive belt Bracket-Dial mounting bracket Bushing-Variable conoenser rubber mounting Cap-Small grid -contact cap Capacitor-Adjustable dual trimmer (C24, C28) Capacitor -10 Mmfd. (C27) Capacitor -109 Mmfd. (C10, C11) Capacitor -120 Mmfd. (C14, C15) Capacitor -120 Mmfd. (C23, C30) Capacitor -180 Mmfd. (C18) Capacitor -220 Mmfd. (C 19 ) Capacitor -270 Mmfd. (C31) Capacitor-.0035 Mfd. (C5) Capacitor-.0047 Mfd. (C3) Capacitor-.01 Mfd. (C2) Capacitor-.01 Mfd. (C4, C17, C20, C29) Capacitor-.015 Mfd. (C21) Capacitor-.05 Mid. (C34) Capacitor-.07 Mfd. (C22) Capacitor -0.1 Mfd. (C8, C9, C12, C13) Capacitor -0.25 Mfd. (C16) Capacitor -0.25 Mid. (C33) Capacitor Pack-Comprising 2 sections each 18 Mfd.

(C32, C36) Capacitor -32 Mfd. (C35) Coil-Antenna coil-X, A, and C bands (L2, L3, L4,

Coil-Oscillator) coil-A and C Bands only (L7, L8, L9) Coil-Oscillator coil-X band only (L10) Coil-Choke coil (L6) Condenser -2 -gang variable tuning condenser (C6, C7,

C25, C26) Core-Adjustable core and stud for coil, Stock No. 30293 Core-Adjustable core and stud for coil, Stock No. 30294 Core-Adjustable core and stud for i -f transformers Dial-Station selector dial scale and holder (for Euro-

pean use only) Dial-Station selector dial scale and holder (for other

than European use) Drive-Variable condenser vernier drive and pinion gear Indicator-Station selector indicator pointer Lamp-Dial lamp Pulley-Drive belt idler pulley-less spring Pulley-Variable condenser drive pulley-located on con-

denser shaft Reactor-Filter reactor (L16) Resistor-Ballast resistor tube, type 260K -1A, for 220 -

volt operation Resistor-Ballast resistor tube, type 135K -1A, for 110 -

volt operation

Voltage values as specified should hold within ±20% when the receiver is normally operative at its rated line voltage. To duplicate the conditions under which the voltages were measured requires a 1,000 -ohm -per -volt d -c meter, having ranges of 10, 50, 250 and 500 volts. Use the nearest range above the specified measured voltage. A -c voltages were measured with a corresponding a -c meter. 14653 30301 30545 13250 30546 13714 3998

14284 12286 5145 5027

12285 o035

13730 4389

14638 12008 12581 11285

4786 11196

14650 14637 12007

30291 30299 14376

14308

13838 14645

30306

30305 30307

14854 30373 12673

30308 4119

Resistor -50 ohms, 8exiblC type, 1/10 watt (R3) Resistor -150 ohms, carbon type, } watt (R14) Resistor -180 ohms, insulated, } watt (R16) Resistor-S30 ohms, carbon type, } watt (R5) Resistor -470 ohms, insulated, } watt (R8) Resistor -5,600 ohms, insulated, } watt (R7, R15) Resistor -15,000 ohms, carbon type, } watt (R6) Resistor -22,000 ohms, carbon type, 1/10 watt (R17) Resistor -56,000 ohms, insulated, } watt (R4) Resistor -100,000 ohms, carbon type, } watt (Rl, R2) Resistor -150,000 ohms, carbon type, } watt (R12) Resistor -470,000 ohms, insulated, } watt (R1S) Resistor -560,000 ohms, carbon type, } watt (R11) Resistor -1 megohm, carbon type, } watt (R9) Screw-No. 6-32 x 3/16 -inch headless set -screw for drive

pulley, Stock No. 14639 Shaft-Station selector knob shaft and pulley Shield-I-F transformer shield can Shield-I-F transformer shield cap Shield-Radiotron shield Socket -6 -contact 6D6 or 2525 Radiotron socket Socket -8 -contact 6A8, 6Q7G, 25L6 Radiotron or bal-

last resistor tube socket Socket-Dial lamp socket Spring-Idler pulley tension spring Spring-Retaining spring for core, Stock Nos. 14648,

12664 and 12006 Switch-Range switch (S1, S2) Switch-Tone control switch (S3) Transformer-First I -F transformer (L11, L12, C10,

C11) Transformer-Second I -F transformer (L13, L14, C14,

C15, C18, R17) Trap-Wave trap (L1, C1) Volume control and power switch (R10, S4)

REPRODUCER ASSEMBLIES (Speaker No. 84106-1)

Cone-Reproducer cone, complete, centered in metal cone housing-less transformer (L15)

Reproducer, complete Transformer-Output transformer (Ti)

MISCELLANEOUS ASSEMBLIES Escutcheon-Station selector escutcheon and crystal Knob-Range switch knob Knob-Station selector, volume control or tone control

knob Screw-Chassis mounting screw and washer assembly Screw-No. 8-32 x 4 -inch headless cup -point set -screw

for knob, Stock Nos. 12673 and 30373

RCA PAGr. 9-79

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T uóF (7

RCA MFG. CO., INC. NADEIS 87EY,87X,87Y Schematic

On some instruments, R15 is 68,000 ohms and R16 Is 33,000 ohms.

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80 RCA

MODELS 87EY,87X,87Y Chassis Wiring,Coils

r-ane u+

`NMOtlH( ) j}

F



RCA I'A(if'. 9-81

OUTPUT 25L6

41 k

Calibrate the tuning dial by adjusting main dial pointer to the low -frequency (end) calibration mark on dial with the gang tuning -condenser plates in full -mesh position; then adjust the small (vernier) pointer to "O." These are friction adjustments.

Perform alignment in proper order, tabulated below, starting with No. 1 and following all operations across, then No. 2, etc. Adjustment locations are shown on figures 1

and 2. Cathode-ray alignment is highly preferable; the connections

to the receiver circuits are shown on figure 4. If an output indicator is used, connect it across the loudspeaker voice -coil and advance the receiver volume control to full -volume position.

RCA MFG. CO., INC..

MODELS 87EY,87X,87Y Socket, Trimmers Voltage ,Alignment Lead Dress

Iq."R19 R19

BALLAST 95K2

R18 25v.

L_28v._J A.C. A.G. lóv

( 63 vry110v. -D...

}-16v{.1.5"*) 110Iv. I

02v LG.G.

TERM. r eRD. 6.3"

RECT. / I

A.G. 5Z5//L usv.J I AUDIO

AC. 75',1 6J7

I 80v. 110v.

1

r

1.5v. (-abm

CATHODE CURRENTS III 6.0M4. (4) 0.36 MA.

(2) 6.5MA. (5) 56 MA 13) - (6) 70 rA

BLUE C40

TERM. BRD.

Ìr I I = L 6.3v. A. C. J

0 v.

IsT DET - OSC. 6A8

G.G

(-1.5v.*)

I.F.

-1.5. TRANS

d) I

®rd _J 71'60® KC,

0.2v r r- i 75v.(s )

-4v I I

I 55v. t.j t , se 89, 13T IrT I.F. I10 v 1

O 6.3v. AIC.

.--J

6.3v. 2ND DET \RRL ¡+.C. y I IF ©RCA M FG. CQINC

A.V.C. 6H6 ADl 6K7 P-84121-0

(TRANS. (

úIl L6

CG 460KC,

.RI. ADJ.

BOTTOM VIEW - REAR Or CHASSIS

Precautionary Lead Dress.-(1) Dress power cord away from audio circuits. (2) Keep filament leads away from C24. (3) Keep bus lead from term. 8 of S1 -S2 to ground lance as short as possible. (4) Bus lead from term. 12 of S1 -S2 to C27 -C28 thence to C10 should be 4S/s inches long. (5) Bus lead from term. 4 of S1 -S2 to L2 -L3 should be 21/2

inches long. (6) Bus lead from L2 to C8 -C9 should be 37/e inches long and dressed over bus lead from antenna coil to range switch. (7) Bus lead from term. 7 of SI -S2 to L12 - L14 should be 21/4 inches -long. (8) Keep bus lead from term. E of 2nd. i -f trans. to term. 2- on phono. board as short as

possible. (9) Keep leads of C10, C29, and C34 as short as possible. When replacing bus leads, use only wire having same diameter as original.

6 W REGT

BALLAST

C30-OSC.` C32-0SC. SEC.A0J.1 SEC ADJ. $000 K.C. ,1500K.C. L9 TO L7 1 \ 460K.C.I TERM"C- 460K.C. (

AUDIO IF.

o.¡FI2'

]`JRANS,

zne.DET?t0 HOLE s\4AV.0 A -

ANT. \ ANT

SPEAKER/ MODELee é)E SPEAKER IS' MOUNTED EXTERNALLY FROM CHASSIS / Ti

TRANS .PT DET. OSC.

RI 470,000A

/5N-736 CD -ANT C2l-0SC. LIS-OSC CA MFG. CO.. NC. poo K. C. 20.000K .C. 600 NEC

TOP FRONT OF CHASSIS


Alignment Procedure Connect the 'low" output terminal of the test oscillator to

the positive (+) side of C38 (same point as "low" vertical input to cathode-ray oscillograph) for all alignment operations. Regulate the output of the test oscillator so that minimum signal is applied to the receiver to obtain an observable output indication. This will avoid a -v -c action.

The term "Dummy antenna" means the device which must be connected between the "high" test -oscillator output and the point of connection to the receiver in order to obtain ideal alignment. "No signal, 550-750 kc" means that the receiver should be tuned to a point between 550 and 750 kc where no signal or interference is received from a station or local (heterodyne) oscillator.


Order of

ment

Test Oscillator Range

Selector Receiver

Dial Setting Circuit tp Adjust

Adjustment Symbols

Adjust to Obtain Connection


Frequency Setting

1 6I{7 I -F Grid Cap

.001 Mfd. 460 kc "A" Left No Signal 550-750 kc

2nd I -F Trans. L8 and L9 Max. (peak)

2 6A8 Det Grid Cap

.001 Mfd. 460 kc "A" No Signal 550-750 kc


3 Ant Term. 300 Ohms 20,000 kc "C" Right 20,000 kc "C" Ose. C27 Max. (peak)'$

4 Ant Term. 300 Ohms 6,000 kc "B" Center 6,000 kc "B" Ose. C30 Max. (peak)*

5 Ant. Term. 300 Ohms 6,000 kc "B" 6,000 kc "B" Ant. C8 Max. (peak)

6 Ant. Term. 200 Mmfd. 600 kc I "A" Left 600 kc "A" L -F One. L15 Max. (peak)

7 Ant. Term. 200 Mmfd. 1,500 kc "A" 1,500 kc "A" H -F Ose. C32 Max. (peak)

8 Ant. Term. 200 Mmfd. 600 kc "A" 600 kc "A" L -F Ose. LIS Max. (Peak)

9 Ant. Term. 200 Mmfd. 1,500 kc "A" 1,500 kc "A" H -F Ose. C32 Max. (peak)

*Use minimum capacity peak if two peaks can be obtained. ..0.»$After this adjustment, check for image signal by shifting receiver dial to 19.080 kc.


82

MDDELS

Specs 87EY,87X,87Y

.,Phono.,Parts RCA MFG. CO., INC.

Electrical Specifications FREQUENCY RANGES R -F ALIGNMENT FREQUENCIES "Broadcast" (A) 530.1,720 kc "Short Wave" (C) 20,000 kc (osc.) "Medium Wave" (B) 2,100-6,800 kc "Medium Wave" (B) 6,000 kc (osc., ant.) "Short Wave" (C) 6,800-22,000 kc "Broadcast" (A) 600 kc (osc.), 1,500 kc (osc.) Intermediate Frequency 460 kc RADIOTRON COMPLEMENT (1) RCA -6A8 First Detector-Oscillator

2 RCA -6K7 (5) RCA -25L6 Audio Power Output (2) Intermediate Amplifier (6) RCA -25Z5 Half -Wave Rectifier (3) RCA -6H6 Second Detector and A.V.C. (7) RCA -95K2 Ballast (4) RCA -6J7 Audio Voltage Amplifier

Pilot Lamps (2) Mazda No. 40, 6.3 volts, 0.15 amp. POWER- SUPPLY RATINGS A -C Rating 105.125 volts, 25-100 cycles, 55 watts D -C -Rating 105.125 volts, 50 watts PowER OUTPUT (125 -volt, a -c supply) PowER OUTPUT (125 -volt, d -c supply)

87EY, 87Y 87X 87EY, 87Y 87X Undistorted 1.9 watts 1.7 watts Undistorted 1.3 watts 1.2 watts Maximum 3.0 watts 2.8 watts Maximum 2.1 watts 1.9 watts Loudspeaker (Permanent -Magnet Dynamic) Impedance (v.c.) 2.2 ohms at 400 cycles

Phonograph Attachment.-A terminal board is provided 1, yellow to terminal 2, and shield extension to terminal 3. for connecting a phonograph into the audio amplifying Tape unused red and blue leads separately. Connect a 2 circuit. RCA Victor Models R-93, R -93-A, R -93-S, R-93-2, conductor twisted cable between the Record Player binding or R-94 Record Players should be connected as follows: Re- posts and the screw terminals on Radio -Record switch. When move link between terminals 1 and 2 on terminal board. employing the R -93-S, the 0.1 mfd. capacitor contained in Connect green wire in Radio -Record switch cable to terminal the R 93-S should be shorted out.

-

STOCK No. DESCRIPTION STOCK

No, DESCRIPTION

14380

14388 14623 12717 14338

12607 12581 11350 12110 14383 14392 12723 14282 12404 12725 12406 14625 13894 14391 12811

6005 4838 5148

13138 14393

11315 4886

14626 4839

12484 14624 14621 14622 14372 14373

14363

5119

12800

12006

14381 14389

30127

14364 14345

11982 30085

14341 14344 14382

4340 14340 14620 14361 14343

RECEIVER ASSEMBLIES

Arm-Band indicator operating arm and hub-teas set screw Stock No. 14350

Belt-Variable condenser drive belt Board-Antenna and ground terminal board Board-Phonograph terminal board Bushing-Variable condenser mounting bushing and

screw assembly Cap-First I -F transformer shield top Cap-Second I -F transformer shield top Cap --Grid contact cap Cap-Radiotron shield cap Capacitor-Adjustable dual trimmer (C30, C32) Capacitor -4.7 Mmfd. (C6) Capacitor -56 Mmfd. (C10) Capacitor -110 Mmfd. (C12, C13) Capacitor -120 Mmfd. (C15, C16) Capacitor -150 Mmfd. (Cl) Capacitor -180 Mmfd. (C17) Capacitor -270 Mmfd. (C23) Capacitor -390 Mmfd. (C7) Capacitor -600 Mmfd. (C33) Capacitor -3,600 Mmfd. (C29, C31, C36) Capacitor-.0035 Mfd. (C20) Capacitor-.005 Mid. (C2, C34) Capacitor-.007 MEd. (C19) (Models 87X and 87Y

only) Capacitor-.01 Mfd. (C11) Capacitor-.01 Mfd. (C19, C24) (C19, .01 Mfd. used

in Model 87EY only) Capacitor-.015 Mfd. (C25) Capacitor-.05 Mfd. (C4, C35) Capacitor-.07 Mfd: (C26) Capacitor -0.1 Mfd. (C14, C22) Capacitor -0.25 Mfd. (C5, C18, C21) Capacitor -10 Mfd. (C38) Capacitor -32 Mid. (C37) Capacitor Pack -2 sections each 18 Mfd. (C39, C40) Coil-Antenna coil and shield (L2, L3, L4, L5) Coil-Oscillator coil and shield (Lll, L12, L13, L14, L15, L16) Condenser -2 gang variable tuning condenser (C8, C9, C27, C28) Connector -3 -contact female connector for reproducer

cable Core-Adjustable core and stud assembly for coil Stock No. 14373 Core-Adjustable core and stud for Stock No. 14376

and Stock No. 14283 Dial-Station selector dial scale Dial-Band indicator dial and mounting bracket assembly (Models 8 X and 87Y only) Dial-Bandindicator dial and mounting bracket assembly

(Model 87EY only) Drive-Variable condenser vernier pinion gear and shaft Drum-Variable condenser drive belt drum complete with set screws Fastener-Station selector dial scale fastener Gear-Indicator drive gear and hub assembly and indi-

cator pointer stem and gear assembly complete Idler-Station selector drive belt idler Indicator-Station selector indicator pointer Indicator-Vernier indicator pointer Lamp-Dial lamp Pulley-Station selector drive belt pulley and knob shaft Reactor-Filter reactor (L17) Reflector-Dial reflector and lamp bracket assembly Retainer-Drive shaft and pulley retainer-holds tuning knob shaft and pulley on range switch shaft

13716 11647 13736 14284 11305 12454 11300 14023 11281 14580 13734 11398 11323 13479 11452 12285 12679 30284

14350

14374 12008 14375 14171

4786 11196

12007

12907

14342 14370 14371 14376 14283

13838 14335 14379

14685 5118

14684 14686

12667 5118

14627 14628

14398 14359 14269

4560

11210

11377

4982 14270

Resistor --2,200 Ohms-Insulated, f watt (R13) Resistor -5,600 Ohms-Carbon type, * watt (R17) Resistor -10,000 Ohms-Carbon type, I watt (R3) Resistor -22,000 Ohms-Carbon type, 1/10 watt (R5) Resistor -22,000 Ohms-Carbon type, } watt (R16) Resistor -33,000 Ohms-Insulated, I watt (R2) Resistor -33,000 Ohms-Carbon type, 1/10 watt (R8) Resistor -82,000 Ohms-Insulated, } watt (R15) Resistor -100,000 Ohms-Carbon type, 1/10 watt (R12) Resistor -100,000 Ohms-Insulated, 1 watt (R11) Resistor -120,000 Ohms-Carbon type, } watt (R14) Resistor -220,000 Ohms --Carbon type, 1/10 watt (R6) Resistor -270,000 Ohms-Carbon type, f watt (R20) Resistor -390,000 Ohms-Carbon type, I watt (R10) Resistor -470,000 Ohms-Carbon type, 1/10 watt (R1) Resistor -470,000 Ohms-Insulated, f watt (R9) Resistor -2.2 Megohm-Insulated, I watt (R4) Resistor-Ballast resistor tube type No. 95K2 (R18,

R19) Screw-No. 8-32x3/16 square head. set screw for gear

Stock No. 30085 and drum Stock No. 14345 and arm Stock No. 14380

Shield-Antenna coil shield Shield-First or Second I.F. transformer shield Shield-Oscillator coil shield Socket-Dial lamp socket Socket -6 -contact 25Z5 Radiotron socket Socket -8 -contact 6A8, 6K7, 6J7, 6836, or 25L6 Radio -

tron socket Spring-Retaining spring for core Stock No. 12006 and

Stock No. 12800 Spring-Tension spring for indicator drive gear Stock

No. 30085 Spring-Tension spring for idler Stock No. 14341 Switch-Range switch (S1, S2) Switch-Tone control switch and power switch (S3, S4) Transformer-First I.F. transformer (L6, L7, C12, C13) Transformer-Second I.F. transformer (L8, L9, C15, C16, C17, R5, R6) Trap-Wave trap complete (Ll, C3) Volume Control (R7) Washer-Felt washer for indicator pointer

REPRODUCER ASSEMBLIES MODEL 87X (76493-3)

Cone-Reproducer cone (L10) Plug-I-contact male plug for reproducer Reproducer-Complete Transformer-Output transformer (T1)

REPRODUCER ASSEMBLIES (RL -71-3) MODEL 87Y and 87EY

Cone-Reproducer cone and dust cap Plug -3 -contact male plug for reproducer Reproducer-Complete Transformer-Output transformer (Ti)

MISCELLANEOUS ASSEMBLIES Escutcheon-Station selector escutcheon and crystal Knob-Station selector knob Knob-Volume control, tone control or range switch knob Screw-Chassis mounting screw and washer assembly (Model 87EY only) Screw-Chassis mountingscrew and washer assembly (Model 87Y only) Screw-Chassis mounting screw and washer assembly (Model 87X only) Spring-Retaining spring for knob Stock No. 14359 Spring-Retaining spring for knob Stock No. 14269


RCA PAGE 9-83

RCA MFG. CO., INC.

Pilot Lamps (3) Mazda No. 46, 6.3 volts, 0.25 ampere

POWER SUPPLY RATINGS

2 Rating A 105425 volts, 50.60 cycles, 80 watts Rating B 105.125 volts, 25.60 cycles, 80 watts Rating C . 105-125/200-250 volts, 50-60 cycles, 80 watts

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RCA MFG. CO., INC.

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Precautionary Lead Dress.-Maintain original length and size of the following: (1) all leads from range selector to antenna and oscillator coils; (2) lead from oscillator coil to ground; (3) leads from gang condenser to range selector. (4) Keep filament leads twisted and dressed away from 6F5 grid lead. (5) Keep leads from C2 as short as possible.



RCA PAGE 9-85

RCA MFG. CO., INC.

Electric Tuning Alignment. -Select six "A" band stations to be tuned with push -buttons. It is usually preferable to choose stations not on the same network. For push -buttons 1 and 2, choose stations from 540 kc to 1,160 kc; for 3 and 4, stations from 600 kc to 1,260 kc; and for 5 and 6, stations from 770 kc to 1,550 kc. The push -buttons are numbered consecutively from left to right.

Allow the receiver to operate about five minutes before proceeding with "Electric Tuning" alignment.

To align so that push-button 1. will tune WJZ, e.g., first set "Range Selector" to "Standard Broadcast" position and manually tune WJZ at a dial setting near 760 kc. Then set "Range Selector" for "Electric Tuning," press push-button 1, and again tune WJZ for maximum output by carefully adjusting first L20 and then C35. If there is difficulty in

MODEL 87K1 Socket, Tr imnsrs Voltage,Tunler

recognizing the desired station it should be borne in mind that clockwise rotation of trimmer and magnetite -core screws lowers the frequency to which the radio is tuned. Preliminary setting of the adjustments may be made with the use of a test oscillator. In any case final adjustment should be made on the desired station. Use "Magic Eye" indication of maximum output; tune for minimum width of dark sector of the eye. Proceed similarly, following the above table for the remaining push -buttons.

The first -detector trimmer adjustment will appear to be broad when tuning strong local signals because of a.v.c. action, so to obtain accurate adjustment on strong signals it will be necessary during adjustment to use an antenna only a few inches long. Use enough antenna to not more than half close the "Magic Eye."

I } (-16V') } (130V.) 190V.

24311 -0.5V. I 60V. I I

1 255V. i 1 I AUDIO L I (-1.3V.)p 6F5 6.3

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i,,7,4-- 6.3V. A.C. OUTPUT A.C. L____J 6F6 C.G. # L___J

ELECT.CAP RED BLACK

I C25 C23.C25

C23

I ©RCA MFG.CO.INC. I I

P-64101-0 I II I

190V.

1

6.3V.

1 -339V.- . I Q; C22BaowN ,, Ó 255V.--

CATNODERAYOSCILLO6RAPNVERTICAL"TOTMTERM. _ ELECT. CORNECTIONS

NI' IS VERTICAL`O"TOCIIASSIS t"' OCT. 1 -95V.-

i aost. L(*) ----- 6AB -11V. TO TUNING

225V.- - - TUBE 6'6

350V. A.C.

RECT. SW4

350V A.C.

RED - SLACK

0 05V F

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660.

2- DET. 6 A.V. C.

5H6 -1 vRl TI

us ADJ. 460KC

r


Figure 1-Radiotron Socket Voltages and Trimmer Locations

Measured at 115 volts, 60 -cycle supply -Tuned to approximately 1,000 kc ("Standard Broadcast") - No signal being received -Volume control minimum -Tone control optional

Note: Two voltage values are shown for some readings. The value shown in parentheses with asterisk (8) indicates operating conditions without voltmeter loading. The other value (generally lower) is the actual measured voltage and differs from the value shown in parentheses because of the additional loading of the voltmeter through the high series circuit resistance.

Radiotron Cathode Current Readings

Measured with Milliammeter Connected at Tube Socket Cathode Terminals Under Conditions Similar to

Those of Voltage Measurements

(1) RCA -6A8 -Ist Det.-Osc. 12 ma.

(2) RCA -6K7 -I -F Amp. 8 ma.

(3) RCA -6H6 -2nd Det.-A.V.C. - ma.

(4) RCA -6F5 -A -F Amp. 0.2 ma.

(5) RCA -6F6 -Output 41 ma.

(6) RCA -5W4 --Rectifier 63 ma.*

(7) RCA -6U5 -Tuning Tube 1.6 ma.

(*Cannot be measured at socket)

Voltage values as specified should hold within ±20% when the receiver is normally operative at its rated line voltage. To duplicate the conditions under which the voltages were measured requires a 1,000 -ohm -per -volt d -c

meter, having ranges of 10, 50, 250 and 500 volts. Use the nearest range above the specified measured voltage. A -c

voltages were measured with a corresponding a -c meter.

TUNING -- I RCA MFG. CO..INC SN -77 3

R

IATDE 05C

6A8

u4 1sTI F.

oRa-0 TRANS.

c OSC.1500KC

Pic III

AUDIO C3

RNT.6000KC. C2a C25

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/TO 1550KC V 540 1160KC R4NGB

600 126OKC. I

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AGOKC LCS LCS 121 660. B 4 02 RRNGE RRNGé

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011

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'T RECT.

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BOTTOM BOGE -REAR OF CHRTSI5

Figure 2-Radiotron, Com/onent Part, and Trimmer Locations



86 RCA LáVDEL 87K1 Alignment Parts

RCA MFG. CO., INC.


Test Oscillator

Range Selector


Circuit to Adjust

Adjustment Symbols

Adjust to Obtain


Dummy Antenna

Frequency. Setting

8%7 I -F Grid Cap

.001 Mfd. 480 kc "Standard Broadcast"


2nd I -F Trans. L15 and 1.18 Max. (peak)

6A8 Det. Grid CapBroadcast" .001 Mfd. 480 kc "Standard No Signal

550-750 kc 1st I -F Trans. 1.13 and 1.14 Max. (peak)

S Ant. Term. A 300 Ohms 8,000 kc "Made" Wave" 8 me "B" One. C31 Max. (peak)

4 Ant. Term. A 300 Ohms 6,000 kc "Medium Wave" 8 me "B" Ant CS Max. (peak)

5 Ant. Term. A 300 Ohms 20,000 kc "Short 20 me "C" Osc. C42 Max. (peak)

6 Ant. Term. A Mmfd. 200 Mm 800 kc "Stan Bro a dcdarast"

d 800 kc Osc. "A" I`F 1.12 Max. (peak)

7 Ant. Term. A 200 Mmfd. 1,500 kc "Standard Broadcast" 1,600 kc "A" H -F

Osc. C28 Max. (peak)

8 Ant. Term. A 200 Mmfd. 800kc "standard Broadcast"

800kc Osc

q, I`F 1.10 Max. (peak)

9 Ant. Term. A 200 Mmfd. 1,600 kc "Standardot1,600 Broadcast" kç "A"

Osc. C29 Max. (peAk)

10

Correct an antenna to receiver Ant. Term. A. See Electric Tuning Alitemettt described below.

640-1,180 kc "Electric Tuning' b40-1,160 ke "A"

Ant. 1

1

& 1.20 and C36 Min. Eye

11 540-1,180 kc "TuniElecntrg' 510-1,180 kc "12'se. 2 t 2ic L21 and C98 Min. Eye

12 800.1 980 kc "Electric Tuning" 600-1,260 kc "A" Ow. S

& Ant. 3 1.22 and C37 Min Eye

1S 600-1,260 kc "Electric Tuning' 600-1,280 kc

" Osc. 4 A

&Ant. 4 L23 and C38 Min. Eye

14 770-1,550 kc "Electric Tuning c 770-1,660 ke & Ant 66 L24 and C39 Min. Eye

15 770-1,550ke "Electric Tuning" 770-1,550 kc "A"0cc.6

& Ant. 6 L25 and C40 Min. Eye

Use maximum capacity peak if two peaks can be obtained. Check for image signa by shifting receiver dial to 20.92 inc.

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RCA PAGE 9-87

RCA TUBE COMPLEMENT

RCA MFG. CO., INC.

Electrical and Mechanical Specifications POWER SUPPLY RATING

MODEL R89 Specifications Installation Data

(i) RCA -6F5 Audio Voltage Amplifier A-5 105-125 volts, 50 cycles, 45 watts (2) RCA -25L6 Audio Power Output A-6 105-125 volts, 60 cycles, 45 watts (3) RCA -25Z6 Rectifier LOUDSPEAKER VICTROLA MECHANISM Type Electrodynamic Motor Voice Coil Impedance 4.5 ohms at 400 cycles Turntable Speed Undistorted 1.0 watts Pickup Maximum 2.0 watts Impedance 90,000 ohms at 1,000 cycles

Cabinet Dimensions Height 5 inches Width 12} inches Chassis Base Dimensions (with speaker) Height 3 inches Width 7* inches Weight (Shipping) 8 pounds Weight (Net)

R-89

Wiring Details

O LTAGE OUTPUT A MPL IF IE R

Tube Locations

CONNECTING VICTROLA TO: 1939 RCA RADIO RECEIVERS OF "90" SERIES :

Plug male jack on end of Victrola cable into female receptacle on receiver chassis. Push or turn "Phonti " switch to "Phono" position, and operate Victrola according to instructions.

RADIO RECEIVERS HAVING "PHONO" TERMINAL BOARDS.

RED

GREEN

EL

L SHIELD.'

ER IS EQUIPPED «IT e' 'vet TERMINAL COIENECT SHIELD TO TERMS ALSO TAPE END! of RED AND x"E LEADS

LLOVE

'

d 1`, ''11

RCA Radio Receivers to which the above illustration applies 5T1, 5T4, 5T5, 5T6, 5T7, 5T8, 6T5, 8T2, 8T11, 8K11, 85T5 86E, 86K, 86T, 86Th, 86T4, 86K7, 86T44, 87K, 87T, 87K1, 87K2, 87T2, 88K, 810K, 810K1, 810T, 810T4, 811K, 812K, 813K, 816K, 811T.

For following Receivers, Yellow lead should go on Terminal No. 1, Green lead on Terminal No, 2: 6K2, 6T2, 6K3, 6K10, 6T10, 7T1, 7K1, 85T8, 86T3, 86T2, 86T6, 87T1.

Insulate shield of switch wires from chassis, on following RCA Receivers: 5T, 6T, 6K, 6K1, 7T, 7K, 7X, 7X1, 8T, 8T10, 8K, 8K1, 86X4, 87EY, 87X, 87Y.

Receivers having a Four Terminal Board: 9K, 9T, 9K1, 9K2, 9K3, 9K10, SOT, 10K, 10K1, 13K, 15K. Reverse Red, and Blue leads to Terminal Board of C9-6, T9-9, T8-16, C8-17.

RADIO RECEIVERS WHOSE FIRST AUDIO AMPLIFIER TUBE IS OF THE GRID CAP TYPE.

REMOVE

GRID

TAPE

5HIELD GR

LOW

TAPECRED

STOCK NS 5824 SWITCH

.PHONO- (REAR VIEW)

EEN (MI BLU

PHONO LEAD

NOTE - THIS METHOD FOR USE ONLY WHEN BIAS FOR THE TUBE 15 OBTAINED BY MEANS OF CATHODE RESISTOR N8E40!

RCA Receivers for which above method app ies: 125, 128, 128E, 224E, 225, 226, T6-1, C6.2, T6-9, T7-5, C7-6, T7-12, C7-14, T8-14. C8-15, T8-18, C8-19, C8-20, C9-4, T9-10.

LEATHER WASHER SHOULD SE OIL SOAKED. 40E1 ARDOR STEEL WASHER.

OIL BALL BERRI NG USE LIGHT OIL

Depth 10 inches Depth 5* inches

6 pounds

TURNTABLE MELO OM SMART BI RETAINING RINO B WASHER

Motor Details

AIR OA IS.OI42,.00075 GAP MUST BE UNIFORM.

OIL OUTER BEARING SURrACE,USE L14HT on.

OIL INNER BEARING SURFACE. USE LIGHT OIL.

RADIO RECEIVERS WHOSE FIRST AUDIO TUBE IS OF THE GRID CAP TYPE. AND FIXED BIAS FOR TUBE IB OBTAINED THROUGH GRID LEAD.

AP

REMOVE

CAPACIT04 ST.wME

9ez4

fRUrtcK R V1EW\ PHOHC POSITION

GREEN YELL

PLEAD

RED EILUE

NOTE REMOVE BLUE ANC/ SW LEADS Cbsect YELLOW LEAD TO TERMINAL SHOWN.

RADIO RECEIVERS USING 6C5 OR 6J5, 6C5G OR 6J5G, TUBE FOR FIRST AUDIO AMPLIFIER.

STOCK NE r STOCK N9 1 14179 I 14180

Manual Starting Synchronous 78 r.p.m.

Crystal

STOCK NH 5824 RAROAROIE SWITCH

RORER VIEWI POSITION

BHrtLDl EEN , !WI VELLOW J,

L J T[+wnrD. III,RO OPE '11 PHPND

RED ei EJ EAO

NOTE --WHEN STOCK N2 1417915 USED AND TUBE IS OF / G TYPE CARF MUST 8E TAKEN TO SEE THAT -SHIELD TERMINAL Nº 1 15 GROUNDED ON TUBE SOCKET. WHEN STOCK NE 14180 15 USED RE13...

8 LEAD SHOULD BE TAPED,OPIIT C.

Stock No. 14179 Adaptor opens grid circuit, and inserts 2,700 ohm resistor in cathode of 6C5 or 6J5 tubes, for bias on Phono reproduction.

Stock No. 14180 Adaptor opens grid circuit of 6C5 or 6J5 tube, Stock No. 14180 Adaptor necessary for RCA: C1l-1, C13-2,

T10-1, C11-3, C13-3. Stock No. 14179 Adaptor necessary for RCA: C15-3, C15-4.

RADIO RECEIVERS WHERE RECEIVER VOLUME CONTROL IS TO BE USED TO ALSO CONTROL "PHONO" VOLUME.

PIDNO VPOS T OH

TO AUDK)

OMEN GEN YELIOw

TAPE Cm RED 1434/LATE. SHELD FROM DIASSM

RHONO LEAD



88 RCA MODEL R89 Schematio,Voltage Chassis Wiring,Notes Parts

AUDIO 6F5

Schematic Circuit Diagram

ILCA M FG. CO., INC.

OUTPUT 251.6-G

General Description and Service Data The model R-89 Electric Victrola consists of a crystal pickup,

a three tube audio amplifier, a dynamic speaker, and motor turntable mechanism in a table type walnut veneer cabinet. Any record, up to and including the 12 -inch size, may be played on this instrument.

The crystal pickup unit is securely sealed in a metal casing against extreme changes of climate. If failure occurs due to a defective crystal unit, no attempt should be made to repair it, but a new replacement crystal unit should be installed.

This instrument may also be used to play records through a radio receiver, if so desired. To do this remove shielded lead at rear of cabinet from pickup jack, and plug into shorting jack, and plug lead from radio receiver into pickup jack. Methods of connecting mechanism to various receivers, are shown on next page.

Phonograph Motor The synchronous motor used in this instrument is designed to he

simple and foolproof. The parts that may require attention are plainly shown. The motor is started by turning "on" the power switch and giving the turntable a clockwise spin with the hand. Smooth starting

Do not remove Turntable while set is turned on, as damage to tubes will result.

Replacement Parts Insist on genuine Factory -tested parts, which are readily identified and may be purchased hot authorized dealers.

GREEN TO br5

GRID CAP

6F5 251.6-G 25Z6 -G AUDIO OUTPUT RECTIFIER

Wiring and Socket Voltages *NOTE: Values with star (*) are operating voltages in circuits

with high series -resistance, and when measured will read lower depending on the voltmeter loading.

Measurements made to chassis unless otherwise indicated. Values should hold within approximately ± 20% with 117 -volt a -c supply.

and running will be insured by keeping the bearings well cleaned and oiled.

Hum and Vibration. -A small amount of hum when starting, decreasing to a negligible amount when running, is normal. 1f excessive vibration occurs it may he due to:

1. Insufficient lubrication, or any failure that will cause binding. 2. Leather washer not oiled. (Check to make certain that the

leather washer is above the steel washer.) 3. Motor not properly supported from motor board. 4. Burrs on poles of rotor or stator. Remove with fine emery

cloth. 5. Stator should be free to rotate between limits of damping

assembly. Removing Rotor. -The rotor and turntable assembly simply rests

nu the ball bearing at bottom of vertical bearing. Remove by lifting upward.

Rotor Adjustment. -Remove motor from cabinet. Loosen the three screws that hold the rotcr to the turntable, insert three 16 -mil shims at equal distances around the gap between the rotor and stator, and then carefully tighten the three screws. The top of rotor must be Hush with top of stator; add additional steel washers beneath the stator if necessary.


Unit List

Price STOCK

No. DESCRIPTION

Unit List Price

AMPLIFIER ASSEMBLIES 31040 Mountings -Turntable rubber mountings suffi - 31886 Cable -Shielded amplifier input cable complete cient for one turntable .25

with plug .25 32023 Rotor -Turntable and rotor laminations for 50 14393 Capacitor -.01 mfd. (C4) .30 cycle motor 5.20 11315 Capacitor -.015 mid. (C6) .20 31926 Rotor -Turntable and rotor laminations for 60

4870 Capacitor -.025 mfd. (C5) .20 cycle motor 5.20 30899 Capacitor -0.1 mid. (C1) .30 32022 Stator -Stator assembly complete with coils and 31323 Capacitor -16 mid. (C2, C3) .65 laminations for 110 volts, for 50 cycle motor. 2.95 13428 Resistor -150 ohms, } watt (R8) .20 31925 Stator -Station assembly complete with coils and 12199 Resistor -270,000 ohms, } watt (R6) .20 laminations for 110 volts, for 60 cycle motor.. 2.60 12285 Resistor -470,000 ohms, * watt (R7) .20 31039 Turntable -Finished turntable top plate only - 13601 Resistor -10 meg. 4 watt (R9) .20 less rubber mountings .95 31319 Socket -Tube socket .25 14231 Washer -Bearing shim washers .02

4083 Washer -Leather washer .02 PICKUP AND ARM ASSEMBLIES SPEAKER ASSEMBLIES

31888 Base -Pickup arm base and pivot shaft .95 (84202-3) 31050 Crystal -Pickup crystal and needle screw 3.75 31202 Cone -Speaker cone and voice coil (L3) 1.30 31887 Pickup arm and crystal complete 6.75 31201 Speaker Complete 3.95 31745 Ring -Retaining ring for pickup arm base .02 31203 Transformer -Output transformer (T1) 1.00 12539 Screw -Pickup needle screw .22 MISCELLANEOUS ASSEMBLIES

MOTOR ASSEMBLIES 31986 Cable -Pickup -to-receiver interconnecting cable

required when instrument is used as record 31045 Base -Motor support, damper, and bearing cup player only .55

assembly .60 3961 Knob -Volume control knob .10 31046 Bearing -Bearing assembly .70 13053 Screw -Motor mounting screws, cushions and 31041 Cap -Rubber spindle cap .05 nuts, sufficient for one motor .30 31047 Cushion -Rubber cushion for bearing .15 14278 Socket -Amplifier shorting socket or pickup out - 31924 Motor -105-125 volts, 50 cycle (M1) 8.90 put socket .25 31923 Motor -105-125 volts, 60 cycle (M1) 8.60 31889 Volume control and switch (R3, S1) 1.50




RCA l'AGN, 9-89

1IcA. ath'G. CO.. INC.

Alignment Procedure Cathode-ray Alignment is the preferable method. Connections for

the oscillograph are shown in the chassis drawing.

Output Meter Alignment. -If this method is used, connect the meter across the voice coil, and turn the receiver volume control to maximum.

Test -oscillator. -For all alignment operations, connect the low side of the test -oscillator to the receiver chassis, and keep the output as low as possible to avoid a -v -c action.

For additional details, refer to booklet "RCA Victor Receiver Alignment."

Pre-setting Dial. --With gang condenser in full mesh, the pointer should be horizontal.

Re -sealing I.F. Adjustment Screws. -After completion of alignment, seal the I.F. magnetite -core adjustment screws with a few drops of household cement.

hTJDELS 94BK,94BT Schematic ,Socket Trim>âlers,Voltage Alignment,Lead Dress

Steps Connect the high side of test-oscil-

lator to- Tune

test-osc. to- Turn

radio dial to- Adjust the follow - ing for mas. peak

output

No. I 1D5 -G I -F grid

cap, in series with .001 mfd.

455 kc Quiet point

between 650-750 kc

L7 and L8 (2nd I -F

transformer)

No. 2 1C7 -G 1st-det. grid cap, in series with

.001 mfd. 455 kc

L5 and L6 (1st I -F

transformer)

No. 3 Antenna lead, in series with 200

mmfd. 1,500 kc 1,500 kc C5* (oscillator)

C2 (antenna)

* Trimmer C6 on gang condenser should be unscrewed one com plete turn from tight, before adjusting C5.

VOL. CONTROL & BATT. 5W.

CATHODE RAY OSC IL LOG RA PH CONNECTIONS.- TERTICAL "'.I'TO

HIS TERM VERTICAL "0 -TO CHASSIS

UNSCREW CG ONE TURN FROM TIGHT BEFORE ADJUSTING C5.

ELECT. CAP

C19

GANG COLAD.

C2(ANT. TRIMMER ON T?) C3 (ANT VAR. COHO.) I

CS(OSC.TRIMMER,ON TO

CE (T(OSC.VAR.CbND.)

SPEAKER .

SOCKET

BATTERY DRAIN "A- 2.0V. 0.36 AMPS 'B- 50V. (12.2 M. A. (SWITCH AT CURRENT CUTTER.)

117.9 M. A. (SWITCH AT "FULL POWER") -B" 135V. 17.0 M.A.(SWITCH Al CURRENT CUTTER')

4

13T-DET &OSC.-1CT-G c (-1.24V*) F G / 62V. COIL OV. i O

v. ti

L4®L3

2 BRACKE

L3

i® I. F.

105-G

C.G.

Ci

0-- 0 9

PRI ODI 45S RC

1ST- I.F. TRANS

O Or

`10

Cjo

Ij 2V.

84v

62V.

REM 2.1.DET..A.F. 16'R3 PLATEC_UßRENT (-5.4v.*) &A.V.0

SWITCH AT FULL POWER' -O.1V. RB 1F7-G R2,\

L L6 M. A. (/ CG. 2V.

*2 2.8 M.A. O [-1.45V*) , ! ú 2;4V. C V '3 0.2M.A. 84V._.7 2V. OY. v RT L7

4 T.OM.A. BDY P 0 a11 1` O ® i 459KC - R12' . R ft, 4. ` ©

OUTPUT 1' '0-IYY 94BT-94BK LGS-G 41-.4_7\1 tj OM 2.1.1.ETRANS.

©RCAMFG.CO.,INC. = CURRENT (38V.*)-1 1

CI 1.-- P-84230-0 CUT TER SW.' IV,

f

3 á

ANT COIL L 9TURN3


Figure 2-Radiotron Socket Voltages, and Location of Parts

1LT DET. Q OSC. I. F. 2'RDET. A.F.-A.V.C. OUTPUT 1C 7-G 1D5 -G IF 7-G 1G 5-G

BOTTOM VIEWS OF SOCKETS

D u C N

'-'92

a á _ m E ro N m ci6= yo a+-.

0 wb Ç; °E> >.,- t'ó O V1 S N C u .b,- Q U ..0 =6>_" - ; Q,_

, Q yT O >..- ,-I N Yn Z. : . H !

1 Y LI -Dóot12-10

ao b Gr.,"

w1 +, 7cnrn C I

ó 0.1 MEp.

u r

f

C7 9-189 I

MME Q

T- "\g OSC. COIL C6 6

2-10 2"1D RIME IMF

C8 IsT I.F C9

100 TMAnS' 56 MME MMFI

WHEM us 3V. Ä BATT REPLACE Rt WITH Ha 30933 R13TOR(o2 %

R13 0.82*

USE ONLY FOR AIR CELL,

OPERATION `

CABLE CONNECTIONS 1 TO'B- BATT. BATT ` PLUGS IN

MOOEL 94 BK L\ \ 90 V. -RED- .a \ BATT. 45V. _i__. +9oV 94 DT 94 8R

LACH 6TV-GREEN ` 1- }G]ÌY. ®RCAMFG-CO.,INC.

P -e4203-4 B t

BATT-* 45V. ,vELLow -o-TELLOw- 1ä

BATT. PWR.

2V - --- r SWITCH (ON VOL. CONTROL)

32 I

LM1'F C12 100 TRAM. 100 MME. ir }H* MAW

Gt9 8 MFn.

RII FULL POWER l

sT P w

,TSY. }sw ITCH 220

33 OSITI RTLc ""-

CURRENT CUTTER

!Ii GREEN I REO

SI r

FOR PERMANENT SE OR 131 v. '" D1sCONHECT JUNCTIOH OF AuARM FROK SWITCH

Frequency Range 540 to 1,750 kc R -F Alignment Frequency 1,500 kc (osc., ant.) Intermediate Frequency 455 kc

C18 007

MFA

470^ QQQQ

T1

L9

2-N



90 RCA

MODELS MODEL Parts

94BK,94BT 94BT6 RCA Lists

91B,e Replacement Insist factory

\IFG. CO.,

Parts readily identified and

INC.

94 BT be from dealers. on genuine -tasted parts, which are may purchased authorized

Unit Unit STOCK DESCRIPTION List STOCK DESCRIPTION List No. Price No. Price

RECEIVER ASSEMBLIES 30952 Shaft -Station selector knob shaft .25 30954 Cable -Battery cable complete 1.35 3682 Shield-Radiotron shield .22 30949 Capacitor -56 Mmfd. (C9) 11196 Socket-Radiotron socket .25 12723 Capacitor -56 Mmfd. (C4)

.25 30956 Socket -Speaker socket .30 30904 Capacitor -100 Mudd. (C8, C11, C12)

.Y5 14191 Spring -Drive cord tension spring .04

12724 Capacitor -120 Mmfd. (C16) .25

30953 Switch -Current -cutter switch (S3). .45 13003 Capacitor -180 Mmfd. (C13)

.25

.25 30948 Transformer -First I.F. (L5, L6, C8, C9).... 2.00 5148 Capacitor -.007 Mfd. (C18) .20 30903 Transformer -Second I.F. (L7, L8, C11, C12) . 1.80

14393 Capacitor -.01 Mfd. (C14, C17) .30 30947 Volume control and on -off switch (R5, Si, S2) 1.50 4870

30899 Capacitor -.025 MEd. (C15) Capacitor -0.1 Mfd. (C1, C10)

.20

.30 REPRODUCER ASSEMBLIES 13610 Capacitor -8 Mfd. (C19) 1.00 Model 94BT (Speaker 84226-1) 30950 Coil -Antenna coil (Li, L2) 1.10 30970 Cone -Reproducer cone and voice coil (L9) ... 1.25 30895 Coil -Oscillator coil (L3, L4) 1.05 30969 Reproducer complete 5.65 30945 Condenser -2 - gang variable tuning condenser 30971 Transformer -Output transformer (T1) 1.25

(C2, C3, C5, C6, C7) 2.70 30877 Cord -Drive cord .20 Model 94BK (Speaker 84145-2) 30905 Core -Adjustable core for I.F. transformers... .35 30973 Cone -Reproducer cone and voice coil (L9)... 2.25 30951 Dial -Dial scale and dial scale holder and bracket 30972 Reproducer complete 6.30 30701

assembly Drum -Tuning condenser drive cord drum with

.70 3C974 Transformer -Output transformer (T1) 1.90

14635 set screw

Indicator -Station selector indicator pointer... .40 .20 MISCELLANEOUS ASSEMBLIES

30955 Resistor -0.82 ohm, flexible type (R13) .30 30975 Crystal -Station selector celluloid crystal .45 14074 Resistor -82 ohms, I watt (R9) .20 14269 Knob -Station selector or volume control knob.. .20 14581 Resistor -220 ohms, } watt (R11) .20 12827 Plug -3 -contact male plug for battery cable- 30538 Resistor -330 ohms, } watt (R12) .20 94BK only .20

5029 Resistor -56,000 ohms, } watt (R1) .20 30935 Resistor -2.2 ohms, flexible type to replace 12199 Resistor -270,000 ohms, } watt (R7) .20 Stock No. 30955 when using 3 -volt battery.. .30 11172 Resistor -470,000 ohms, } watt (RS) .20 30308 Screw -Chassis mounting screw and washer - 30963 Resistor -820,000 ohms, } watt (R6) .20 94BT only -Package of 4 .25 12679 Resistor -2.2 meg., } watt (R2, R10) .20 30467 Screw --Chassis mounting screw and washer - 30962 Resistor -8.2 meg., } watt (R3) .20 94BK only -Package of 4 .25 14887 Retainer -Retainer for knob shaft .01 14270 Spring -Retaining spring for knob .05

BATTERY REQUIRED CURRENT CONSUMPTION 6 -volt Storage "A" Battery. At 6 volts, 2.8 amperes. POWER OUTPUT (6 volts "A") Undistorted 0.45 watts Operating Controls (1) Power Switch -Volume; (2) Tuning Maximum 0.7 watts Tuning Drive Ratio 8 to 1

Replacement Parts 91- 8 T> Insist on genuine factory -tested parts, which era readily Identified and may be purchased from authorized dealen.

Unit Unit STOCK DESCRIPTION List STOCK DESCRIPTION List

No. Price No. Price

RECEIVER ASSEMBLIES 11353 Resistor -680 ohms, } watt (R10) .20 5175 Resistor -5,600 ohms, I watt (R17) .20

30959 Cable -Battery cable complete Cable

1.35 12759 Resistor -15,000 ohms, } watt (R3) .20 30967 .45 14284 Resistor -22,000 ohms, 1/10 watt (R15) .15 -Shielded volume control cable

Capacitor -56 Mmfd. (C8) 12723 .25 5029 Resistor -56,000 ohms, 3 watt (RI) .20 30904 Capacitor -100 Mmfd. (C9, C10, C12, C13).. .25 11172 Resistor -470,000 ohms, i watt (R7, R11) .20 12724 Capacitor -120 Mmfd. (C17) .25 12679 Resistor -2.2 meg., } watt (R4, R6) .20 13003 Capacitor -180 Mmfd. (C14) .25 30271 Resistor -4.7 meg., } watt (R2) .20 34964 Capacitor -330 Mrnfd. (C4) .25 14887 Retainer -Retainer for knob shaft .01 30966 Capacitor -1,000 Mmfd. (C22) .30 30952 Shaft -Station selector knob shaft .25 14393 Capacitor -.01 Mfd. (C15, C18, C19) .30 3682 Shield-Radiotron shield .22

4937 Capacitor -.01 Mfd. (C27) .25 11196 Socket-Radiotron socket .25 4888 Capacitor -.05 Mfd. (C11) .20 30956 Socket -Speaker socket .30 4839 Capacitor -0.1 Mfd. (C16) .30 14312 Socket -Vibrator socket .25

30899 Capacitor -0.1 Mfd. (C1) .30 14191 Spring -Drive cord tension spring .04 30965 Capacitor -O.25 Mfd. (C20) .30 30957 Transformer -First I.F. transformer (L5, L6, 30961 Capacitor -Comprising 2 sections each 16 Mfd. C9, C10) 1.90

(C23, C24) 2.10 30903 Transformer -Second I.F. transformer (L7, L8, 30968 Coil -"A" filter choke coil (L10) .55 C12, C13) 1.80 30950 Coil -Antenna coil (L1, L2) 1.10 30960 Transformer -Vibrator transformer (T1, C21, 30895 Coil -Oscillator coil (L3, L4) 1.05 L11) 5.25 30945 Condenser -2 -gang variable tuning condenser 14309 Vibrator -Plug in vibrator (L12) 4.25

(C2, C3, C5, C6, C7) 2.70 30958 Volume control and on -off switch (R5, S1).... 1.50 30877 Cord -Drive cord .20 30905 Core -Adjustable core for I.F. transformers .35 REPRODUCER ASSEMBLIES (Speaker 84226-1) 14289 Clips -Battery clips -1 marked "+" and 1 un-

marked .30 30970 Cone -Reproducer tone and voice coil (L9) ... 1.25 30951 Dial -Dial scale and dial scale holder and bracket 30969 Reproducer complete 5.65

assembly .70 30971 Transformer -Output transformer (T2) 1.25 30701 Drum -Tuning condenser drive cord drum with

set screw .40 MISCELLANEOUS ASSEMBLIES 5140 Fuse -Battery cable fuse (F1) .10

14635 Indicator -Station selector indicator pointer .20 30975 Crystal -Station selector celluloid crystal .45 13220 Resistor -56 ohms, * watt (R16) .20 14269 Knob -Station selector or volume control knob.. .20 14074 Resistor -82 ohms 4. watt (R9) .20 30308 Screw -Chassis mounting screw and washer - 30498 Resistor -390 ohms, } watt (R18) .20 Package of 4 .25 30681 Resistor -470 ohms, 1 watt (R12) .22 14270 Spring -Retaining spring for knob .05




RCA PAGE 9-9' Trimmers,Voltage Alignment,Lead Dress

igc.Ac - ... ",.

RCA MFG. CO., INC. P.00T. Q OBC. 9..T6

-ARCAMFG.CO.INC

AAA! 6A8G

2) )

6K1G ,LI ANT. COIL

TRANS

`FòñT -

éloóñc

SMIELO

6416 6K6G) 3

cE3 CPA

TI C21 LII

BRATS

.DCT. OUTPUT nnT. ÓÑó .FA4Vt.

Pro -setting Dial.-With gang condenser in full mesh, the pointer should be horizontal.

Re -sealing I.F. Adjustment Screws.-After completion of alignment, seal the I.F. magnetite -core adjustment screws with a few drops of household cement.

EJDEL 94BT6 Schematio,Socket

Steps Connect the high side of test-oscil-

lator to- Tune

test -oser. to- Turn radio

dial to- Adjust the follow - ing for max. peak

output

No. 1 6K7 -G I -F grid

cap, in series with .001 mfd.

455 kc Quiet point

between 550-750 kc

L7 and L8 (2nd I -F

transformer)

No. 2 6A8 -G 1st-det. grid cap, in series with

.001 tnfd. 455 kc

L5 and L6 (1st I -F

transformer)

No. 8 Antenna lead, in series with 200

mmfd. 1,500 kc 1,500 kc CS* (oscillator)

C2 (antenna)

* Adjust C6 on gang condenser to one complete turn from tight, before adjusting C6.

VOLUME á CONTROL am:SWITCH

IIIIIIIIII

CATHODE RAY OSCILLOGRARI CONNECTIONS VERTICAL -H1 TO THIS TERM. VERTICAL -O- TO CHASSIS

_\ GANG COMO.

et ( TRNa e3( MR..n

(-1.339," 6A8 -C. -

CC55((

I DET 4 OSC.

C7(04C ' BLUE

GREEN , UNSCRECGONE B L TVRN 'Rom1144.4r! BEFORE A93WTUtl CS

CATHODE CURRENTS III.. 9.6 MA. 131...0.17 M.A. I21 9.2 M.A. 141 13.2 M.A

Á BATTERY DRAIN 6.0 V., 2.6 AMPS.

VIBRATOR

oA M°4 cD, Inc. v e.2a4-o

SPEAKER SOCKET

43V

U7V-'

-5.15V. (

6K6 -G OUTPUT

oSC. COIL

LS

-143 V.

C.G.

6t3)V) :

VIP I.F. TRANS.

pn

u i ' óóó Â

,0R O

1ú qqqq

{m p

1'1'12 A 1 Ñ 1 O VO Y 1.b

.S.4:1.6

> r 1.+ñF3 íâ «ú:-p

ñ $pÿ ~ b

i «a7

i¡ 9FovG«úu a a-«.a 1. ' .4.e1,--5

o ; ñ'-' W ñ S9. p,y U Ú -O m mE

J g Ñ N .q . ,Li u M

1 Ç m-c.c§a,n i i,ba0ó

u E 6KT-G O m E SAt7 Q gg ó ebD Ó I. F. :: Ea d, « .: íaa Ó b ú ro> = UV... ti

o-r á ' v a od

iiü N R O y V s ä " s" º y_«A ó ÿm 7a léc.n..9ro"c$omóaoa4o

Ó RTJa O á á Gi V aA

4ro,m

.roro a úLT; .,g.,oa« L I.aóAa d 1.,rimF°c

d-g.Y 41 'm R'^ m0 .: 2 c9Á^cim vi ávi fáPO 4Ty oL1 (: v roil y V -Gl g«

BLUE

6 AB- G 1sT DET. ff OSC.

C2 C3 2-1O--, 10-388 MME

L 6115

L2' 4.8,,

ANT. COI L

BLACK

TO EXT. GND.

1 9TURNS

CI 0.1 ee. MFD.

56,000n L3' lA CS

2-10 MME

BOTTOM VIEW - REAR OF CHASSIS

6KT-G I.F.

C4 330 MMF.

1*T I.F TRANS.

00 . r MME, ` Pe"

CB L51 el 56

MME. Bolo

C6' 23.10 MMF.

L4 315

4

L6 8A

BOTTOM VIEW OF TUBE SOCKETS

2nD I.F. C13 TRANS.l00

ÿ MME 1 CI 2 r 1

6QT-G 2MD' DET., A. F., ti

A- V- C.

o

6K6 -G OUTPUT

C10 100 c c MMF

100 J MMF. A

C11 L7 LB -05 IBn len

R3 MED. l

I S,o00 T n

180 MMF.

VOL.CONT RS

250,000n

R9 R1O 82n 68015

CIB /.01

MF

R7 511 4lO,oOo 470,000

- CI4

/:L,_., =Ito tom F.

-= `OSC. CT COIL 9-189 MME.

R4 2.2 MEG.

© RC A MFG. CO. INC. P-84211-3

94 BIG

C9

R2 4.7

Frequency Range 540 to 1,750 kc MEG. R -F Alignment Frequency 1,600 kc Intermediate Frequency 455 kc

F1 L13 BROWN 5'A.FUSE

-O ` el,p o +2..5V. BATT. Si

(ON VOL - BROWN CONTROL)

TO HEATERS

LOUDSPEAKER

BLACK L1O LI1

I .03n 7flrl 11 /7rR-

RIS 22,000n

CI5 .O1MFD.

RE 2.2 = MEG.

YELLOW

RED- r I

O

©

FR13A9¡

4wc.

TRANS.

C16 T 0.1 MED.

BRCWN- 'BLACK

R12 470a.

C22 2 T C23 T C24

IMMOFT¡ 16 ± MED. = MED.

LT1

0.84

GREEN

B60n I

C21 I

MFD. I BROWNrI

Type 5 -inch Permanent -magnet Dynamic BLUET' Voice -coil Impedance 3 ohms at 400 cycles - ------- -- -J

BRAID -2 L12 rfreCIA VIE

T2 L9 2.7a.,

R O.Sn

1

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C19 .01 MEO

R16 5615

C27 -01

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I AGE 9-92 RCA MJDEL 41- Schematic,Socket,Trinaners i

Voltage,Alignmentiyarts I

104V. -- OUTPUT 25L6 -G

ry 2LAu -J

VOL. CONTROL L

POWER SWITCH

BLACK

GREEN

-6.3V. BLUE C7/ ' j ` CAPACITOR

(AC.) -. PACK«

RCA MFG. CO., INC.

7 fCC13

C14

CATHODE CURRENTS

(1) 0.4MÁ OL. CONTR MIN) {11.2M.Á. VOL. CONTR. MAX.)

(21 0.12 M.A. (3) 47M.A. (4) 5BM.A.

C14

RED

Note: Values with (4) are operating voltages. CD Values not starred are actual measured voltages.

GANG CONDENSED /ÒV. Measurements made to chassis unless otherwise indicated.

_-(00V4) \leasurements made with set tuned to quiet point, volume control liv. at minimum, using 1,000 -ohm -per -volt meter, having ranges of 10,

50, and 250 volts. (Use nearest range above the specified measured voltage.)

117V - (AC)

RECT. 2526 -G

-1 25v. e.z.)

J

1

, 0' ^ L4

ÿñ TÑiä sAr-er 110V.--

r R.F.

6K7 R.E

6.3V. COIL 1(44

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.-- -110V.

C RCA MicxC.. INC. V-e4zo4-o


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RCA PAGE 9-9% MODEL 95T5

sso-re 6w-R,r aso -rico KC KC. KC. MANLML

Deo 321 ft! ets(Ì

ctO,`c*\\ ctS

1KI0-400 70-243 201140 11. MO MMF M. MMF IMF

ANTENNA TRIMMERS IDIReCTION OF

Pe. OwITCNts

311 112,1E.2.111._2_4. 3 !I{¡, e1T

4 LA

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3-1S NMF

OSCILLATOR COILS

RCA MFG. CO., INC.

BLACK

Model 95T5 Schematic Circuit Diagram

IF PEAK 455 KC

FOR OTHER DATA SEE INDEX

6Ae-6 1sT OeT 4 osc

Rn-- 1e0A

cl 0.1 IIFD.

GREEN

!K

STD -6 RECT.

5.3v. To IKAT1Rl i DAL LAMP

UE

s

5

POWER -VOLUME TUNING CONTROL I 2 3 4 s CONTROL

607 I.F

3RowN(á0á' 00ow

ri00n

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Location of Controls, Model 95T5 The right-hand push button is for dial tuning CATHODE CURRENTS

QS VOLUME CONTROL

(I) 6AS-3 (2) 607 -12.1 M.A. (3) GQ7-G_ - _ - - 0.41314A. (4) 6K6-6______22 M.A.

TOTAL RECTIFIED R CURRENT 44 M.A.

s

POWER SWITCH SI

CI, ! MFD.

Schematio,Socket,Trimmers Chassis VPiring,Voltage

BOTTOM WOW OF TUB. eocte7s

/

O2i 'O Me u-

00.7 -G 636-6 2 RRT -A.F-Ave OUTPUT

IRMA

Foe NeuT 1Ln. COIL

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IRS

C 15

5V.

kK 6K6ß

OUTPUT RS

OSCILLO0RAPH COKIN - VERTICAL"H1 TO HERE VERTICAL "0- TO CHASSIS.

POWER TRANS T I

C 14 I

5ROw

OSCILLATOR COILS

PUSH -SUTTON SWITCH

2

6

ó

e320321 182 ól27 u U u

32 sri !M 515

Z

L 12

\.

ANTENNA TRIMMERS

- 2e5V.

5TYG RECT.

O O o O® o

L14

i

LIS

m,32p I`u 517

LIS

r ' J d IO 607H2

DOLT.

GREEN 1.--2L -"ße-* _ 517 GRID CAP

317

l

C20 \Sr-

C21 C2 yy 23 24 "UP

YELLOW

C IS

TO 607G t2RIO CAP

7

V

C3 IS00KC.

C2 AN

C5 OSC

C6/ 1500K

33. 1. F. TRANS.

o

t9 0 n

RIO

L7 PRI. ADJ. 455 K.C.

607

. O O ti O

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V

SK

Model 95T5 R -F Wiring Diagram and Socket Voltages


BLACK

GREEN

CI

a TO La

TE

CK

\CC17K

COIL L4

Im I.F. TRANS.

LS PRI. AQI 455 K.C. T'

RID

O 0 IRS 6AS-S

la OCT 4 OSC. errs Tws4

NOTE: Values with star ( * ) are operating voltages

in circuits with high series -resistance. The actual measured

voltages will be lower, depending on the voltmeter loading.



TAGE 9-94 RCA IilDEIS 961;, 96T, 96T1 Schematic ,Socket Trimmer s'Chassis Wiring

550- 1066 630-1080KA A58 .5000C MANUAL

St1 s St5 5D1

Ct CEI ctg ctsi CIDI C2

RD -M00 t .a 111-400

ANTENNA TRINKERS

SK 515 SM 515 516

J J J xóx xoxx Utl Ua Wl Ual LM

OSCILLATOR COILS c7

U II CT10N OF FE SMNCMES

9°

2

2.

. ,K2_2

BL

6

CI

Right - Connections Colors of Loudspeaker Cable in Model 96E.

VOLUME CONTROL

RCA MFG. CO., INC.

l'pilE7. < OSC.

CSC. COIL

Caa

;.003 MFO.

5Y 5-4 REGT

GREEN,

DLSe. ;

6K7 6K6 6FS 6K6 -G L r 2^ BET. ANN. AUDIO OUTPUT

I BOTTOM VIEN aF Ì II 1 TUBE SOCKETS

S 8 C00 CIE

MMF ¡ia1MF

LD AR.O r

C EL L- IF TRAlytlo00 RS (./, t50poDw -$- C -Ift.-

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C17

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1Y

LN

TO HEATERS KLEA 1.4 \ Ipoee. 4 DBL LAMP

W4%7 LTpL1

BROWN- BLACK

and and

,TONE CONTROL R14

----POWER SWITCH .51

26

6K6 -G I OUTPUT

I

TO 6FS GRID CAP

05CILLOGRAPH CONN.- VERTICAL 'NI' TO HERE' VERTICAL '0' TO CHASSIS.

6F5 AUDIO

POWER TRANS TI

LINK

CABO> FLLK.

OSCILLATOR COILS

ANTENNA TRIMMERS

5Y 3-G REGT

RED

DR RED BLACK KEW FIL,

Cr)--DLMCK PLRTE,6186-0

la DRc.M.FDLNCn----5WRECK, &K6-0

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TONE CONTRO.. 1414 504000 4

Models 96E, 96T, and 96T1 Schematic Circuit Diagram (L3 is 71/2 ohms, and L4 is 21/2 ohms)

C37-OSC. I BOO KC

CATHODE CURRENTS nl 6A6 -C.... ....... 4.1.4

121 6147 10.5 M.A. 131 6H6 141 6FS 0.48 M. A.

a Z 1=5

35 m m

11

21.0 OET.

ANT. COIL

6A8G 1

We - TRANS

757 0E7I hOSC.

96T SN -D17

AUDI

L6 / L5 BBC. ADJ. SEC. ADJ. 435KC 455 KC

ANT. TRIMMERS OSC. CORES

C24 C23 C22 C'21 C20

fpb®dó L16 LIS1L14 L135U2q

660-IBOOKC 650-IOBOKC BBO-BBOwC

OUTPUT

TOTAL RECTIFIED $ CURRENT 66 M.A.

PUSH BUTTON SWITCH

u 512 1S 5K 5K, 515

u

V Li2 L1S 1.14 LIS L16

A1`R16 QR1SriR12 RS R11S

! 1

BA WN

IF PEAK 455 KC

6H6 2^ "BET. AV.C.

6REEn TO 606-G 517

R-CAP

YELLOW

2" I.F. TRANS

R10

L7 PRI. ADJ 455 K.C.


Models 96E, 96T, and 96T1 R -F Wiring Diagram and Socket Voltages


RED CIA

I" LF TRANS.

GREEN

C 6/ I500KC.

6A8 -G 14 OETd OSC.

C3 I500KC

* NOTE: Values with star (*.) are operating voltages

in circuits with high series -resistance. The actual measured

voltages will be lower, depending on the voltmeter loading.

RCA PAGE 9-9 1MJDELS 95T5 96E 96T 96T1

RCA MFG. CO., INC. Alignment,T>mer,Specs

Alignment Procedure Cathode -Ray Alignment is the preferable method. Connec-

tions for the oscillograph are shown in the chassis drawing. Turn the receiver volume control to maximum.

Output Meter Alignment-If this method is used, connect the meter across the voice coil, and turn the receiver volume control to maximum.

Test-Oscillator.-For all alignment operations, connect the low side of the test -oscillator to the receiver chassis, and keep the output as low as possible to avoid a -v -c action.

Calibration Marks.-The tuning dial is fastened in the cabinet and can not be used for reference during alignment. Therefore calibration marks corresponding to dial readings of 600 kc and 1,500 kc have been stamped in the plate on the front of the chassis, u shown in the accompanying drawing. These marks are used for reference during alignment.

Drum and Dial Indicator Adjustment-Au the first step in r -f alignment, check the position of the drum on the front

shaft of the gang condenser. With the gang at maximum (full mesh) the drum set -screw should be pointing directly down as shown in the drawing. With the drum in this position, and the gang at maximum, move the dial indicator along the drive cord to coincide with the left-hand line as shown. The indicator is held to the drive cord by means of spring clips.

After completion of alignment, and after the chassis has been fastened in the cabinet, turn the gang to maximum and note whether the dial indicator is at the left-hand end mark on the dial; if it is not, loosen the drum set -screw (which is accessible through a slot in the bottom of the cabinet), .turn the drum slightly so that the indicator is at this mark, and then tighten the set -screw.

After completion of alignment, seal the i -f core -adjustment screws with household cement.

For additional details, refer to booklet, "RCA Victor Re- ceiver Alignment."

Steps Connect the high side of test-o8G, to-

Tutu test- osa to-

Turn radio dial to-

Adjust the following for max. peak output

6K7 I -F grid cap, in series with .01 mfd. 466 Quiet point

between 550-750 kc

L7 and L8 (ltd I -F Trans.)

8M -G grid cap, p,

in series with .01 mfd. 466 ke L6 and LS

(Ist I -F Trans.)

3 ue) mAte Antenna lf.

1,500 kc 1,500 kc

calibrationseri mark.

C8 (osa) CS (ant.)

4 Follow "Adjustments for Electric Tuning."

* The oscillator section of the gang condenser has two trimmers, one on top, accessible through a hole in the chassis, and the other on bottom. It may be necessary to adjust both of these trimmers to secure a peak on 1,500 kc.

r

® ® ® m ® ® Ng. ralRtstta O r Olc. COxf1 C C C C

Push -Button Adjustments

No. 1-Approximately 650-980 ke. Noe. 2, 3-Approximately 850.1,080 kc. Nos. 4. 5-Approximately 850.1,600 kc.

These models have six push buttons. The right-hand button connects the gang condenser for dial tuning. The other five buttons are for electric tuning of five different sta tions in the standard -broadcast range. The station buttons connect to separate magnetite -core oscillator coils and separate antenna trimmers which must be adjusted for the desired stations. Use an insulated screwdriver or alignment tool such as RCA Stock No. 31031. Allow at least five minutes warm-up period before making adjustment,. Use a regular antenna for the preliminary adjustments.

The procedure is as follows: 1. Make a list of the five desired stations, arranged in

order from low to high frequencies. 2. Push in the dial -tuning (right-hand) button, and man-

ually tune in the first station on the list.

PLAIT 51419

DIRL INDICRTOR D1420

scoot Delve CORO

DRUM 3Me1

pWpqqRUUM

GRNG RT MRxIMM gq U RNO ppppKC YlOOKC MOJ!MM

.1Ó3MÓCNGIOE RLCNMlYNT-MRRK5 WTHITtC qN wrw

DRUM eHOWN WITH GRNG RT MAXIMUM CRPRCITY

Dial -Indicator and Drive Mechanism Refer to "Alignment Procedure" for explanation of the

"calibration marks" shown in this drawing

Adjustments For Electric Tuning 3. Push in station -button No. 1 (left-hand) and adjust

No. 1 oscillator core (L12) to receive this station. Screw the core all the way in, to lowest frequency, and then unscrew slowly until the station is received.

4. Adjust No. 1 antenna trimmer (C20) for maximum output on this station.

5. Adjust for each of the remaining four stations in the same manner.

(Clockwise adjustment of oscillator cores and antenna trimmers tunes the circuts to lower frequencies.)

6. Make a final careful adjustment of the oscillator cores and antenna trimmers, using one or two feet of wire as an antenna to ensure sharp peaking.

Precautionary Lead Dress. - 1. Dress green lead from antenna coil to switch away from

the chassis and gang.

2. Dress green leads from oscillator coils away from the adjustment screws.

General Model 95T5 is a five -tube superheterodyne. Models 96E,

96T, and 96T1 are sixtube superheterodynes. All of these models have push -buttons for electric -tuning of five stations in the standard -broadcast range, and one 'push-button for dial -tuning over the entire range of 540 to 1,720 kc.

Features of design include magnetite -core i -f transformers,

POWER OuiºuT Undistorted Maximum

3. Dress leads in,powertraneformer primary circuit to left end of chassis.

4. In 95T5, .C27 must be dressed close to chassis and clear of rotor.

5. In 96E, 96T, and 96T1, dress ground bus from heater of 6H6 close to chassis, and dress blue lead from 2nd TF transformer to volume control close to chassis.

Description and magnetite -core electric -tuning oscillator coils; temperature -

stabilized capacitor in the oscillator circuit; automatic volume

control; electrodynamic loudspeaker, and edge -illuminated

straight-line dial. The sixtube models have continuously -

variable high -frequency tone control.

Model 95T5 Models 96E, 96T, 96T1

1.0 watts 2 watts 1.5 watts 4 watts

POWEa SUPPLY RATINGS

Rating A 105.125 volts, 50-60 cycles Rating B 105.125 volts, 25.60 cycles Rating C 105.125/200.250 volts, 50-60 cycles

LOUDSPEAKER (ELECTRODYNAMIC) 951'5 96E 5 6 3.1

Diameter (inches) V. C. Impedance at 400 cycles (ohms)

50 watts 50 watts 50 watts

75 watts 75 watts 75 watts

96T 96T1 5 6

2.6 5 0 2.6

rJ

c N

m o a

2,a22 C11 C5 U

0.000 Ic 8rixá Nhh 8 `J vF,,o,o,o sta K+

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96 RCA MODELS

Push Button 95T 5, 965, 96T, 96T1

Assembly/Parts RCA MFG. (r.CO., INC .

.,

r Ì ^i il . r1 +: ',....,- A

..,b-34-is..a --"\ ;t EC IN

+The Push -Button Assembly is Fastened to the Chassis by Only Two Screws, and may be Quickly and Easily Swung , out for Convenient Access to the Sockets and Other Parts, .

as shown in the above Illustrations.

STOCK Unit STOCK Unit No DESCRIPTION List No DESCRIPTION List

Price Price

RECEIVER ASSEMBLIES 31414 Switch-Push button station selector switch 31416 Capacitor-Oscillator coils trimmer capacitor bank

(S12, S13, S14, S15, 616, S17, S20, S21, S22, S23, S24, 625) 3.05

(C20, C21, C22, C23, C24) 1.20 31412 Volume control and power switch (R5, 51)- 12723 Capacitor -56 mmfd. (C4) .35 Model 95T5 only 1.50 30904 Capacitor -100 mmfd. (C7, C8, C9, C10).... .25 30957 Transformer-First i -f transformer (L5, L6, C7, 13003 Capacitor -180 mmfd. (C12) .35 C8) 1.90 12488 Capacitor -270 mmfd. (C32) - Models 96T, 30903 Transformer-Second i -f transformer (L7, L8, 98T1 and 96E only .35 C9, C10) 1.80 31435 Capacitor -750 mmfd. (C25) .40 31409 Transformer-Power transformer 100-120 volts,

12835 Capacitor -1,000 mmfd. (C27)-Model 95T5 25-60 cycle (T1)-Model 95T5 only 7.25 only .50 31574 Transformer-Power transformer 100-120 volts,

4838 Capacitor-.005 mfd. (C15, C26, C30) (C28, 25-60 cycle (T1)-Models 96T, 96T1 and C30-Models 96T, 96T1 and 96E only) ... .25 96E only 9.20

14393 Capacitor-.01 mfd. (C13, C14) .30 31408 Transformer-Power transformer 100-120 volts, 4886 Capacitor-.05 mfd. (C11) .20 50-60 cycle (T1)-Model 95T5 only 6.30

30899 Capacitor -0.1 mid. (C1, C26, C31) (C26 Model 95T5 only) (C31 Models 96T, 96T1

31380 Transformer-Power transformer 100-120 volts, 50-80 cycle (T1)-Models 98T, 98T1 and

and 96E only) .30 96E only 6.35 31423 Capacitor-Comprising 2 sections 5 mfd. each 31410 Transformer-Power transformer 100-120 and

(C16, C17)-Model 95T5 only 1.40 200-240 volts, 50-60 cycle (T1)-Model 95T5 31424 Capacitor-Comprising 2 sections 8 mid. each only 5.80

(C16, C17)-Models 96T, 96T1 and 96E only 1.65 31575 Transformer-Power transformer 100-120 and 31382 Clip-Oscillator coil and core mounting clip... .04 200-240 volts, 50-80 cycle (T1)-Models 96T, 30894 Coil-Antenna coil (LI, L2) .85 96T1 and 96E only 8.35 31098 Coil-Oscillator coil (L3, L4) .85 31383 Coil-Oscillator coil (L15, L16) .30 SPEAKER ASSEMBLIES 31384 Coil-Oscillator coil (L13, L14) .30 Model 95T5 (Speaker 84326-2) 31415 Coil-Oscillator coil (L12) .30

Cone-Speaker 31097 Condenser -2 -gang variable tuning condenser 31473 1.70 cone and voice coil (L9) Speaker-Complete (C2, C3, C5, C6, C28)-Model 95T5 only 2.70 31472 4.06

31422 Condenser -2 -gang variable tuning condenser 31474 Transformer-Output transformer (T2) 1.65 (C2, C3, C5, C6, C33)-Models 96T, 96T1 and 96E only 2.70 SPEAKER ASSEMBLIES

31413 Control-Volume control, tone control, and power Model 96T (Speaker 84326-1) switch (R5, R14, S1)-Models 98T, 96T1 and 96E only 3.00 31476 Cone-Speakerr cone and voice coil (L9) 1.35

30877 Cord-Indicator drive cord .20 31475 Speaker-Complete 4.45 30905 Core-Adjustable core and stud for i -f trans- 31477 Transformer-Output transformer (T2) 1.00

formers .35 31386 Core-Adjustable core and stud for oscillator coils .15 SPEAKER ASSEMBLIES 31421 Drum-Variable condenser drive cord drum .45 Model 98T1 (Speaker 84327-1) 31420 Indicator-Station selector indicator pointer .10 11891 Lamp-Dial lamp .17 31443 Cone-Speaker cone and voice coil (L9) 1.40 31419 Plate-Dial color plate .12 31683 Speaker-Complete .... .... 4.95

5040 Plug -4 -contact female plug for speaker cable 31477 Transformer-Output transformer (T2) 1.00

31373 -Model 98E only

Pulley-Indicator drive cord pulley .30 .08 SPEAKERE ASSEMBLIES ASSEMBLIES

31425 Resistor-Voltage divider comprising one 22 ohm, Moel (Speaker 84308-1) one 18,000 ohm, one 8,200 ohm, and one 31443 Cone-Speaker cone and voice coil (L9) 1.40 3,900 ohm sections (R3, R11, R12, R15)- 31442 Speaker-Complete .. 4.90

13426 Models 96T, 96T1 and 96E only

Resistor -150 ohms, } watt (R11)-Model .90 31444 Transformer-Output transformer (T2) 1.95

31388 95T5 only

Resistor -390 ohms, 1 watt (R9)-Models 96T, 20 MISCELLANEOUS ASSEMBLIES

31024 98T1 and 98E only

Resistor -880 ohms, I watt (R9)-Model 95T5 .22 31428 Button-Stationlect selector switchpush button.. .06

only .20 31429 Dial-Station selector dial scale.. .. .. .40

30151 Resistor -18,000 ohms, 1 watt (R12)-Model 31095 Discs -10 celluloid protector discs for call letter markers .10 95T5 only .22 31667 Escutcheon-Dial escutcheon-Model 96T1 only .55 12738 Resistor -27,000 ohms, } watt (R10) .20 30773 Knob-Volume control or tuning condenser large

12286 Resistor -56,000 ohms, I- watt (R2) .20 knob-Models 98V, 98T1 and 98E only. .. .15 13734 Resistor -120,000 ohms, I watt (R16)-Models 31355 Knob-Tuning condenser small knob-Models

96T, 96T1 and 96E only .20 96T, 96T1 and 96E only ........ . . .12 12199 Resistor -270,000 ohms, I watt (R7) .20 30883 Knob-Volume control and power switch, or tun - 12285 Resistor -470,000 ohms, I watt (R8)-Model ing condenser knob-Model 95T5 only .15

95T5 only .20 31391 Knob-Tone control and power switch knob 12679 Resistor -2.2 meg., I. watt (R4) .20 -Models 96T, 96T1 and 96E only ..... .. .15 13601 Resistor -10 meg., } watt (R6) .20 30991 Marker-Station call letter markers .40 14887 Retainer-Pulley retainer .01 14270 Spring-Retaining spring for knob Stock Nos. 14350 Screw-No. 8-32 square head set screw for drum 30773 and 31355 .05

Stock No. 31421 .03 30330 Spring-Retaining spring for knob Stock No. 31384 Socket-Dial lamp socket .20 31391 .03 31251 Socket-Radiotron socket .25 30900 Spring-Retaining spring for knob Stock No. 31418 Spring-Indicator drive cord tension spring .05 30863 .05




RCA PAGE 9-97

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RCA MFG. CO., INC.

VOLUME TONE

OFF 'ITONE SOFT LOUD

POWER TONE -VOLUME NT ROL

PUSH BUTTON CONTROLS

Figure 1-Location of Controls

z

MODELS 96T2,96K Schematic ive Data Specifications

EROMCAST SNORT WAVE

RANGE -TUNING

J I ,? ;- tt= =N ] or

CONTROL

RANGE

TUNING

c4

E 3 e . 3

r r

w a `C E <wU

ó

h e

.ñ..^ GL ä 0, c2 a: a:

PACO -4-98 RCA NDDEIS 96T2,96K Voltage,Chassis Wiring Sooket,Trimmrars

Transformer Data NOTE: Values with star (*) are operating voltages in

circuits with high series resistance. The actual measured volt' ages will be lower, depending on the voltmeter loading.

Measurements made to chassis unless otherwise indicated, with set tuned to quiet point and volume control at minimum. Values should hold within ±20% with 117 -volt a -c supply.

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RCA MFG. CO., INC.

n992

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W = NOTE INSERT CONNECTOR V BETWEEN COMMON CONTACT

(CENTER) AND CORP ESPOND

CONTACT BL4CK O TO PREVAILING POWER SUPPLY RATING.

CC UNIVERSAL TRANS. CONNECTIONS

Above- Universal Power Transfotmer Connections.

Q 3 (110 -volt supply for a Vic - 5 trola Attachment may be ob - ó) ó tained by connecting the mo- I- tor to the red and the red - CO - black leads.)

tL

, WL! 1. :` eo da Y Nd ri

o Q J > > O®?0 a 0

I Valu \nti0u 40NN-Y NnéY VO

RED TO POWER SUPPLY -SLACK BED -

RED TB BLACK Iss ESA

TOTAL BLAG

RED YELLOW

GR EN

YELLOW

n

GREEN - RECT FIL.

GREEN BROWN-

RECT.PLATE 660

SLACK -BROWN

BROWN - BLUE

AMP. FIL. BLU E - RED.

BLACK (TAPED)

Ireee -I

SN -800 fedoNte;Roc.,Ile..,N_.L

KIE. WN. . Ko.

sa.`".IN- emcee. Mew.

Above-Replacement Uni- versal Power Transformer (Stock No. 31446.)

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II II

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. -suet. óYAa6.s... ác v°.`ó --úz Y c! ó a Y F^: r 3p;éázw

104 RCA MJDEL 95T Schematic ,Sooket,Tr inner s Voltage,Chassis Wiring Dial lamp Alignment,Parts,Speos POWER OUTPUT (126 -volt, a -c supply)

C2 CS I1 -4O0, 3-15 MM F. 1 m M

)

REO

Undistorted 1.0 watt Maximum 2.0 watts ILT.DET.f)OSC. 4.,

6A8

C4 56-,T R2 MMF. I56,200

10-190 M MF

ADJUST FOR = MAX. CAP. -

CT t00 MMF

a L5 L6 18^ 18^

C6 3-15 MM F.

13804-60.,. T1 ,18604-25-.

GREEN

BLUE TO HEATERS 5 DIAL LAMP

--BLUE

CB

MMF.

J3000

I.F. BOTTOM VIEW 6KT OF SOCKETS

F tl Sr

RCA MhG. CO., INC. Mazda No. 46, 6.9 volts, 0.25 amps.

2"-P DET.,A.FA.A.V.0 p_ 6QT-G

C9 TT p'

_C10 C12 MMF 180

MMF s L,á

A VOL. CONTR.

CII .05 MFD.

FIELD

BaO",/ UCH i, 1900E

r. CI6

RECT. 5V3 -G

Frequency Range 540 to 1.750 kc R -F Alignment Frequency... 1,500 .kc (osc., ant.) Intermediate Frequency_.

Y 455 kc

LOUDSPEAKER Type Voice -coil Impedance

A012 --

earn J -n

5MFD.

2.z MEG.

R5 220000A

CI3 RG .01 S 2.2MEG. MED.

C14 .0025

MED.

R9 R10 560A 68E

OUTPUT 6K6 -G -

BLU E C15 .015 L9 AWE) T2.

II -a. Zf`

R7 R tì 270,000A 4-10.000A

95 T

© RCA MEG co .INC P-134201-3

CI7 SMFD.

$ hernL.,a

I+rmvY i óa -gh 9elta;

. . ö a ,,. ,,.a

Fn. Y 2 u;

eCn)wIn-R.ar.a Irtan

Figure 37 -Schematic Circuit Diagram

Steps

No. 1

No. 2

Connect the high side of test -oscil-

lator to - Tune test- ate. to - Turn radio

dial to -

13Lu E

Universal Power Transformer

Primary Connections for 110 and 220 co is

0

Adjust the follow- S ing for max. peak

output 2

6K7 I -F grid cap, in series with .01

mfd. 455 kc

6A8 1st-det. ¡(rid cap, in series with

.01 mid. 455 kc

Quiet point between

550-750 kc

L7 and L8 (2nd I -F

Transformer)

L5 and LB (1st I -F

Transformer)

No.3 Antenna lead, in series with 200

mmfd. 1,500 kc

1,600 kc (Tmo

150)of 1. C6 (oscillator) C8 (antenna)

* Trimmer C18 on gang condenser should be for maximum capacity before adjusting C6.

- 3D r Úó ;7414

N3345 \ ) 43p \

f

6 -inch Electrodynamic 9.4 ohms at 400 cycles

POWER SUPPLY RATINGS Rating A 105-125 volts, 50-60 cycles, 50 watts Rating B 105-125 volts, 25-60 cycles, 50 watts Rating C . 105-125/200.250 volts, 50-60 cycles, 50 watts

screwed clockwise

STOCK DESCRIPTION No. Unit List Price

RECEIVER ASSEMBLIES 30892 Bracket -Station selector dial scale holder with

indicator shaft and drive bearing assembly 11350 Cap -Grid connector cap 12723 Capacitor -56 Mmfd. (C4) 30904 Capacitor -100 Mmfd. (C7, C8, C9, C10) 13003 Capacitor -180 Mmfd. (C12) 5107 Capacitor -.0025 Mfd. (C14) 4858 Capacitor -.01 Mfd. (C13)

11315 Capacitor -.015 Mfd. (C15) 4886 Capacitor -.05 Mfd. (C11)

30899 Capacitor -O.1 Mfd. (C1) 30898 Capacitor -Comprises two 5 Mfd. sections (C16,

C17) 30894 Coil -Antenna coil (Li, L2) 30895 Coil -Oscillator coil (L3, L4) 30890 Condenser -2 -gang variable tuning condenser

(C2, C3, C5, C8, C18) 30877 Cord -Indicator drive cord 30905 Core -Adjustable core and stud for I.F. trans-

formers 30893 Dial -Station selector dial scale and lamp

bracket assembly 30896 Indicator -Station selector indicator pointer

5226 Lamp -Dial lamp 11361 Resistor- 68 ohms, } watt (R10)

5164 Resistor -560 ohms, } watt (R9) 8072 Resistor -33,000 ohms, } watt (R3) 5029

12199 11172 13998 14114 11198 30631 30902

30903

30889

30888

30891

Resistor -58,000 ohms, } watt (R2) Resistor -270,000 ohms, } watt (R7) Resistor -470,000 ohms, } watt (R8) Resistor -2.2 Meg., } watt (R4, RB) Socket -Dial lamp socket assembly Socket-Radiotron socket Spring -Indicator drive cord tension spring Transformer -First I.F. transformer (L5, 1,13,

C7, C8) Transformer -Second I.F. transformer (L7, L8,

C9, C10) Transformer -Power transformer 105-125 volts,

25-60 cycle (Ti) Transformer -Power transformer 110 and 220

volts, 50-60 cycle (T1) Volume Control and power switch (R5, Si)

.55

.05

.25

.25

.26

.20

.25

.20

.20

.30

1.45 .85

1.05

2.55 .20

.35

.60

.40

.17

.20

.20

.20

.20

.20

.20

.20

.25

.26

.03

1.80

1.80

7.65

6.00 1 50

an-l-.Nv

ómm .ii

oa.-d mmm 000 MWC3



ILCA PAG 1? 9-105

RCA MFG. CO., INC.

Frequency Range One Station between approximately 550.980 kc (Button No. 1-left) Two Stations between approximately 650.1,080 kc (Buttons 2 and 3) Two Stations between approximately 850-1,500 kc (Buttons 4 and 5)

R -F Alignment Frequency 1,500 kc (osc., ant.) 455 kc

11BDDEL 97X Schematic ,Specs Lead Dresa,Hotea

540.1,720 kc

Intermediate Frequency

RCA TUBE COMPLEMENT POWER OUTPUT

(1) RCA -6A8 -G First Detector-Oscillator Undistorted (2) RCA -6K7 I -F Amplifier Maximum (3) RCA -6H6 Second Det., and A.V.C.

POWER SUPPLY RATING (4) RCA -6F5 Audio Voltage Amplifier (5) RCA -25L6 -G Power Output A -C Rating (6) RCA -25Z6 -G Half -Wave Rectifier D -C Rating

Pilot Lamp (1) LOUDSPEAKER (ELECTRODYNAMIC)

Diameter (inches) 5.

is

1.0 watts 1.5 watts

105-125 volts, 50-60 cycles, 55 watts 105-125 volts, 55 watts

Mazda 47, 6.3 volts, .15 amp.

53=

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V. C. Impedance at 400 cycles 3.0 ohms

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CAGE 9-106 RCA Lä)DEL 97X Socket,Trinuners Alignment,Tlmer

RCA MFG. CO., INC.

ALIGNMENT PROCEDURE Cathode -Ray Alignment is the preferable method. Connec-

tions for the oscillograph are shown in the chassis drawing. Turn the receiver volume control to maximum.

Output Meter Alignment.-If this method is used, connect the meter across the voice coil, and turn the receiver volume control to maximum.

Test-Oscillator.-For all alignment operations, connect the low side of the test -oscillator to the black lead and keep the output as low as possible to avoid a -v -c action.

Calibration Marks. - The tuning dial is fastened in the cabinet and can not be used for reference during alignment. Therefore calibration marks corresponding to dial readings of 600 kc and 1,500 kc have been stamped in the plate on the front of the chassis, as shown in the accompanying drawing. These marks are used for reference during alignment.

Drum and Dial Indicator Adjustment-As the first step in r -f alignment, check the position of the drum on the front shaft of the gang condenser. With the gang at maximum (full mesh) the drum set -screw should be pointing directly down as shown in the drawing. 'With the drum in this position, and the gang at maximum, move the dial indicator along the drive cord to coincide with the left-hand line as

shown. The indicator is held to the drive cord by means of spring clips.

After completion of alignment, and after the chassis has been fastened in the cabinet, turn the gang to maximum and note whether the dial indicator is at the left-hand end mark on the dial; if it is not, loosen the drum set -screw

(which is accessible through a slot in the bottom of the cabinet), turn the drum slightly so that the indicator is at this mark, and then tighten the set -screw.

After completion of alignment, seal the i -f core -adjustment screws with household cement.

For additional details, refer to booklet, "RCA Victor Re. ceiver Alignment."

cas-osc. 150o MC

2.. OCT. e& A. V. C..

ANT. COIL 39

O`s 'Lz

6A8G

tST OCT eL osc.

C16 C17

®3 '211Lrl

TRANS 1r RECT.

IST I.F.

0 TSAR \I 6K1

2\

AUDIO

OUTPUT

6F5 e m BALLAST

ciD

L6 / L8 SSA. ADJ. SEC. ADJ. 4955C 55 bec

850 ,s55 -9608c ANT.

TRIMMERS O ® O \ o9C. CARES bed()

650-KIBOKC

5N-858 (37X)

Tube and Trimmer Locations

Steps Connect the high side of test-osc. to-

Tune test- osc. to-

Turn radio dial to-

Adjust the following for max. peak output

1 6K7 I -F grid cap, in series with .01 mfd. 455 kc Quiet point

between 550-750 kc

L7 and L8 (2nd I -F Trans.)

2 6A8 -G grid cap, in series with .01 mfd. 455 kc L5 and L8

(1st I -F Trans.)

3 Antenna lead (blue)

in series with 200 mmf. 1,500 kc 1,500 kc

calibration mark.

C6 (osa.)* C3 (ant.)

4 Follow "Adjustments for Electric Tuning."

* Use minimum capacity peak if two peaks can be obtained. The oscillator section of the gang condenser has two trimmers, one on top, accessible through a hole in the

chassis, and the other on bottom. It may be necessary to adjust both of these trimmers to secure a peak on 1,500 kc.

®m ®®4 ANT. TRIMMERS - O5C. CORES

Push -Button Adjustments

No. 1-Approximately 550-980 kc. Nos. 2, 3-Approximately 650-1,080 kc. Nus. 4, 5-Approximately 850-1,500 kc.

_L -

PULLEY 31373

DIRL INDICRTOR 31420

PLATE 31419

SPRING 31418

INOICRTOR DRIVE- COCO 31481

\\AA. WITH GANG RT MRUMUM FIND 000KC ISOOKC DRUM IN POSITION SHOWN ALIGNMENT-MARKS MOVE- 1NOICHroix

TO COINCIDI

1\

DRUM 31421

DRUM 6HOWN WITH GANG RT MAXIMUM CAPACITY

Refer

Adjustments For These models have six push buttons. The right-hand

button connects the gang condenser for dial tuning. The other five buttons are for electric tuning of five different sta tions in the standard -broadcast range. The station buttons connect to separate magnetite -core oscillator coils and separate antenna trimmers which must be adjusted for the desired stations. Use an insulated screwdriver or alignment tool such as RCA Stock No. 31031. Allow at least five minutes warm-up period before making adjustments. Use a

regular antenna for the preliminary adjustments. The procedure is as follows: 1. Make a list of the five desired stations, arranged in

order from low to high frequencies. 2. Push in the dial -tuning (right-hand) button, and man

ually tune in the first station on the list.

Dial -Indicator and Drive Mechanism to "Alignment Procedure" for explanation of the "calibration marks" shown in this drawing

Electric Tuning 3. Push in station button No. 1 (left-hand) and adjust

No. 1 oscillator core (L12) to receive this station. Screw the core all the way in, to lowest frequency, and then unscrew slowly until the station is received.


5. Adjust for each of the remaining four stations in the same manner.

(Clockwise adjustment of oscillator cores and antenna trimmers tunes the circuits to lower frequencies.)

6. Make a final careful adjustment of the oscillator cores and antenna trimmers, using one or two feet of wire as

an antenna to ensure sharp peaking.


R('A PAGr: 9-107

RCA MFG. CO., INC. VOLTAGE MEASUREMENTS

MADE TO THIS POINT

VOLUME CONTROL RS

CIS

s

9BV.

7v.

25L6 -G OUTPUT

MODEL 97X Voltage ,Parts Chassis Wiring

--TONE CONTROL ' R14 . 2 POWER SWITCH SI

TO 6FS GRID

CAP

74V

OSCILLOGRAPH CONNECTIONS L. VERTICAL )41 TO PLATE OF 2516G

VERTICAL 'O TO B

6.3V. A.C. TO DIAL'

LAMP

C31

45 V A.C.

BK429 BALLAST

RESISTOR

THIS SYMBOL INDICATES CONNECTION TO CHASSIS. l T -B11369

6F5 AUDIO

T2

11, OSCILLATOR

COILS

ANTENNA TRIMMERS

128V

25Z6 -G,- RECT

CATHODE CURRENTS I 648.G 5.2 M.A. 2 647 40M.Á. 3 6H6 4 6F5 0.9M.A. 5 25L6 -G------- ......... 42M.A. TOTAL RECTIFIED $- CURRENT...._52M.A

,.---- BROWN

C3 1500 K.L. \

C36

PUSH BUTTON SWITCH TO 6AP-C GREEN

GRID CAP

' ele 152,1;1323 sza

51 U 5M SIS SK U VLL,

`12 `LIS L14

i

15 L16

1

C20

ter C21 C23

117 V.A.0

BLACK GROUND LEAD

C37

... ,:.

YELLOW

-IV.-

-IV' O ®/

6H6 2NO.DET. A.V.C.

C2 ANT.

05C.

C6 1500K.C.

2"2" I.F. TRANS

RIO

O ® 0.

m

C12

L7 PRI. ADJ. z 455N C.

Já

J

e I

61(7 I. F.

105V.

53V.

BLACK

1" LF TRANS.

n ll

LS PRÌ. ADJ 455 K.C.

OSA.

5

OSC. t.4 COIL)

L3 " L3

1 i

6A 8-G 1sT OCT. 1 OSC.

R2

NOTE HEATERS VOLTAGES TUBES 1.2,3. t 4. 4.3V. A

TUBES 566- 25V.A.0

R -F Wiring Diagram and Socket Voltages


Unit List Price

STOCK O.

DESCRIPTION Unit List Price

31483 Ballast-Ballast resistor tube type BK42-B 13045 Resistor -18,000 ohms, } watt (R12) .20 (R17, R18) .80 12738 Resistor -27,000 ohms, * watt (R10) .20

14338 Bushing-Variable tuning condenser mounting 12286 Resistor -56,000 ohms, } watt (R2) .20 bushing and hardware .08 12199 Resistor -270,000 ohms, } watt (R7, R20) ... .20

31416 Capacitor-Antenna coil trimmer capacitor bank 12285 Resistor -470,000 ohms, } watt (R16) .20 (C20, C21, C22, C23, C24) 1.20 12679 Resistor -2.2 megohm, } watt (R4) .20

12723 Capacitor -56 mmfd. (C4) .35 13601 Resistor -10 megohm, } watt (R6) .20 30904 Capacitor -100 mmfd. (C7, CS, C9, C10).... .25 14887 Retainer-Indicator drive cord pulley retainer .01 13003 Capacitor -180 mmfd. (C12) .36 31482 Screw-No. 8 square head set screw for drum 12488 Capacitor -270 mmfd. (C32) .35 Stock No. 31421 .03 31435 Capacitor -750 mmfd. (C25) .40 31365 Socket-Dial lamp socket .30

4838 Capacitor-.005 mfd. (C26) .25 31251 Socket-Tube socket .25 4870 Capacitor-,025 mfd. (C15) .20 31418 Spring-Indicator drive cord tension spring. . . .05

14393 Capacitor-.01 mfd. (C13, C14, C33) .30 31414 Switch-Selector switch (S12, S13, S14, S15, 4886 Capacitor-.05 mfd. (C37) .20 S16, S17, S20, S21, S22, S23, S24, S25).. 3.05

30882 Capacitor-.05 mfd. (C11) .20 30957 Transformer -1st i.f. transformer (L5, L6, C7, 4839 Capacitor -0.1 mfd. (CI, C31, C35) .30 C8) 1.90

12484 Capacitor -0.25 mfd. (C36) .30 30903 Transformer -2nd i.f. transformer (L7, LB, C9, 31479 Capacitor-Comprising two sections of 18 mfd. C10) 1.80

each (C16, C17) 1.55 31484 Transformer-Output transformer (T2) 1.30 30894 Coil-Antenna coil (L1, L2) .65 31483 Tube-Ballast resistor tube type BK42-B .

31098 Coil-Oscillator coil (L3, L4) .85 (R17, R18) .80 31383 Coil-Push button oscillator coil (L15, L16) .30 31384 Coil-Push button oscillator coil (L13, L14) .30 SPEAKER ASSEMBLIES (Speaker No. 84326-3) 31385 Coil-Push button oscillator coil (L12) .30 31422 Condenser -2 -gang variable tuning condenser 31486 Cone-Speaker cone and voice coil (L9) 1.35

(C2, CS, C5, C6, C28) 2.70 31485 Speaker-Speaker complete 4.35 31413 Control-Volume control, tone control and on -off

switch (R5, R14, S1) 3.00 MISCELLANEOUS ASSEMBLIES 31481 Cord-Drive cord -36 -in. long silk cord .20 30906 Core-Adjustable core and stud assembly for i.f. 31428 Button-Station selector push button .08

transformer .35 31487 Clip-Spring clip and washers to hold dial scale .12 31386 Core-Adjustable core and stud for oscillator coils .15 31429 Dial-Station selector dial scale .40 31421 Drum-Indicator drive drum and hub........ .45 31095 Disc -10 protector discs for call letter markers .10 31420 Indicator-Station selector indicator pointer... .10 31355 Khob-Station selector knob .12 31480 Lamp-Dial lamp .20 30773 Knob-Tone control or dummy knob .15 31419 Plate-Colored dial plate comprising plate, spacers 31391 Knob-Volume control knob .15

and screws .12 30991 Marker-Station call letter push button markers .40 31373 Pulley-Indicator drive cord pulley .08 31488 Mounting-Chassis mounting screw and washer .15 31483 Resistor-Ballast resistor tube type BK42-B 14270 Spring-Retaining spring for knob Stock No.

(R17, R18) .80 30773 and 31355 .05 14525 Resistor -22 ohms. } watt (R19) .20 30330 Spring-Retaining spring for knob Stock No. 30880 Resistor -150 ohms, } watt (R9) .20 31391 .03

C24




SAGE 9-108 RCA

CATHODE CURRENT6 Q. 6.5 M A.(vOL.MNTR. MiN) ZOMA (VOL fnMTR.MAR.\

..O.ISM.A. T.O M A

DTAL RECTIFIED '!" 59 MA.

.6V ¡

L__zsv.__ A.C. my.)

2.50 VOL. COMTRMAX aov)sii CONTR.MM

NV VOL COITE MIM.

Powae OUTPUT (125 -volt, 60 -cycle supply) Undistorted . 1.0 watt Maximum 1.5 watts LOUDSPEAKER Type 5 -inch Electrodyniunic Voice -Coil Impedance...3 ohms at 400 cycles Figure J--Radiotron Socket Volt-

ages, and Location of Parta

Note: Values with () are operating voltages.

Values not starred a r e

actual measured voltages.

Measurements made to chassis unless otherwise indicated.

Measurements made with set tuned to quiet point, volume control at minimum, using 1,000 -ohm -per -volt meter, having ranges of 10, 50, and 250 volts. (Use nearest range above the specified measured voltage.)

Values should hold within approximately ± 20% foi 117 -volt 00 -cycle a -c supply. On d -c, voltages are approximately 1 0 % lower, except heaters, which remain the same.

0000000olD» e mOiNN02N..O+IN9 m

OIDW Omi-m..m..m m91m Mf-Cimi-DiMOi mON t-aJ .... m.. OMN MN..náI..O.. M.-I.a ....MM....MM


RCA PAGE 9-109

i 06aÓ?)

St 1

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úó

RCA MFG. CO., INC. MODEL 97Y,Chassis RC352A MODELS 98X, 98EY, 98YG

Chassis RC352 Schematic,Lead Dress

FREQUENCY RANGES "Standard Broadcast'" (A) 5401,720 kc "Medium Wave" (B) 2.3.7 me "Short Wave" (C) 7.22 me

Six Electric Tuning Positions 550.1,500 kc 2 stations between approximately 550 950 kc (Buttons 1 and 2) 2 stations between approximately 680.1,180 kc (Buttons 3 and 4) 2 stations between approximately 890.1,500 kc (Buttons 5 and 6)

ó 2

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110 RCA

1dJDEL 97Y DIDDELS 98X,98EY,98YG Voltage,Chassis Wiring

Drive Cord. Data,Notes RCA MFG. CO., INC. Specifications

Pilot Lamps (2 on Model 97Y) (3 on Models 98X, 98EY, 98YG) Mazda 47, 6.3 volts, .15 amp. POWER OUTPUT POWER SUPPLY RATING Undistorted 1.5 watts A -C Rating 105-125 volts, 25.60 cycles, 55 watts Maximum 2.5 watts D -C Rating 105-125 volts, 55 watts

LOUDSPEAKER (PERMANENT -MAGNET DYNAMIC) 97Y 98X 98EY 98YG Diameter 12 inches 6 inches 8 inches 12 inches

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o ú a >. y, o C u s ñ

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RCA PAGE 9-111

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VAGE 9-112 RCA MDDEL 95X1 Schenatic,Sooket Voltage ,Alignment Chassis Wiring,Speos. Lead Dress,Tlmer

Removing chassis from cabinet.-Remove back plate and control knobs. Pull the push-button knobs off their shafts. Remove the four chassis screws (bottom of cabinet). Lift the chassis and slide it out at an angle to clear the shaft holes in the top of cabinet.

Removing trimmer -and -switch assembly.-For convenient access to the sockets and parts, it is advisable to remove the trimmer -and - switch assembly. This is a simple operation, accomplished as follows; Unsolder the four leads that connect to the assembly, remove the two nuts that hold the assembly to the chassis, and lift out the assembly. In re -assembling, dress the leads to prevent rubbing against the push- button shafts.

CAUTION: The chassis is connected to one side of the power supply. Avoid contact of chassis or parts to external ground when

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8,1. Alignment Procedure

servicing.

R -Remove chassis from cabinet. ç Eç ú Reel up the antenna wire, and con-

nect the high side of test -oscillator 3áá through an 80-mmfd. capacitor to the

antenna terminal on the antenna trans- . e former. Connect low aide of oscillator < °

º'«'« C g g to receiver chassis through h an .01-mfd.

ai capacitor. Turn gang condenser to Ä: minimum (full out), push to the

manual -tuning (right-hand) button, m5 c 3 3 tune oscillator to 1,560 kc, connect an n E C(..,f., output meter across the voice coil,

la and turn volume control to maximum. Keep antenna roll and lead clear of

chassis during all adjustments. Adjust the two trimmers (Ca and

C6) on side of gang condenser for maximum output, using lowest possible output from test -oscillator.

Turn pointer, so that it is horizontal and pointing to low -frequency end when the gang condenser is at maximum. Check pointer adjustment on a station.

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RCA biI+TG. CO., INC.

CI 1

w0.r 0

ANT. COI L

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POWER OUTPUT (125 -volt, 40 -cycle supply) Undistorted 1.0 watt Maximum 1.5 watts

125-400 75-250 MMF.

MOMISO 12-400 .'MMF. F MF.

4, C26 C27 Cut C29 C30 C51,16 T

F5126 527 528N129 530 531 DIRECTION 12s-400 T5-250 20-150 12-400

OF .MMF i' M F NORF. MMF. sue. aUTTONs C20 + C2I C22 + C23 / C24 +C2 ' C3

T ; -# 3-ISMMF.

6K7 R.F

VOLUME , CONTROL

RI -110.000. TOTAL

OET. COIL

200.sECT2

2526-G RECT.

-e" si

1.1 Ua.oN10 5O12

S Mrs. V

óai MFO.

R9 IMEO.

Li A

C15 .05 MFO

6U 7 DET,

-L RaIß000A

lC7 0.25 Para; R3,

= 2.2MEG.

CB .O1MFD

1.! R4

410,000.

R6

ISO,

D MCD

C9 300 MMF,

R5

25L6 OUTPUT

SFr

tZ ils.

C11 .035

FD.

5E0

C13 6 2 1MFO.

FIELD4A *ACS

OVV VfL

L6-400.


C14 16 MCD

95n1 © AC. MFO. CO., I NC. P-54252-3

L.

as co, HUM NEUT.

COIL LT

DIAL" LAMP BK55B

BALLAST /TUBE

Ì0

RB OA© R7 IsOACOLO

0 170.507

O O S

Figure 1-Schematic Circuit Diagram The line by-pass, C12, is changed to .25 mfd. (Stock No. 12484) in some sets.

Adjustment of Tuning Capacitors The preferable and quickest method of adjusting the tuning capaci-

tors for five different stations, is to employ a test -oscillator, as described below:

1. Make a list of the desired five stations, arranged in order from low to high frequencies.

2. Determine the correct settings of the test -oscillator for these five frequencies. This is accomplished as follows: Tune in each of the five stations on any standard receiver; zero -beat the test -oscillator against each station, and note the exact setting of the oscillator in each case.

8. Reel up the antenna wire. Connect the high side of test-oaejllator through an 80-mmfd. fixed capacitor to the end of the antenna wire. Clip the low side of the oscillator through a 0.1-mfd. capacitor to. one of the chassis -Mounting screws on the bottom of the cabinet. Tune the oscillator to the previously -determined point for the lowest - frequency station, and adjust for a strong output.

OCT.

25166 BALLAST

TUBE

Figure 2-Radiotron Location Note: Values with star (') are

operating voltages. Values not starred are actual

measured voltages. Measurements made to chassis un-

less otherwise indicated. Measurements made with manual -

tuning button (right-hand) pushed in. and set tuned to a quiet point, volume control at minimum, using 1,000 -ohm - per -volt meter, having ranges of 10. 50, and 250 volts. (Use nearest range above the specified measured voltage.)

Values should hold within t 20% for 117 -volt 60 -cycle a -c supply. On d -c, voltages are approximately 10% lower, except heaters, which remain the same.

-n

Precautionary Lead Dress 1. Dress Power cord away from detector coil, beater leads close

to base, leads from electrolytic close to base and free of grid leads.

2. Dress blue lead from r -f plate to detector coil along front edge of push-button shaft holes. Dress all leads to prevent rubbing against push button shafts.

POWER SWITCH

VOLUME CONTROL

RI

DET. COIL

nEo

Issv_

-IlT V_A_C

25Z6 -G RECT.

21V. Ac.

J

Kc

n S31 STATION S25 -"SELECTOR

< 3W1TCH ,TD 551

ORIDaL2

i

ORc v`nl M cco.,INc.

P -M4 25T-0

GANG COND. C3 sso

C2 ( ANT. INC

OET. ,C KC

CS (

3-ls MMF.

4. Turn the volume control of the push-button receiver full clockwise, and push in the left-hand end button. Using an insulated screwdriver, peak capacitors C20 and C26, at the same time reducing the output of the oscillator in order to secure a sharp peak. (Clockwise adjustment of the capacitors tunes the circuits to lower frequencies, and counter -clockwise adjustment tuns the circuits to higher frequencies. The range of each trimmer is three full counter -clockwise turns from the tight position. Do not unscrew more than three turns.)

S. Push in the second button from left, and adjust C21 and C27 for peak output with the oscillator tuned to the frequency of the second station.

6. Proceed in this manner to adjust each pair of capacitors for the -

desired frequencies. 7. Final adjustment may be made in actual reception of the

stations.

BLUE

CATHODE CURRENTS 0.5 MA.(WA cOloTR 5100

... ,2-0MA (WM .CONTRWA) O.nMA.

) 4T.oMA TOTAL R2CiIF120-5-CUAR2NT 59MA.

ELECT" CAP

C13á 4 C13 -CIA ® W a ,

540-0110 5130 -1200 a50 -I500 NC KC

BKsse BALLAST TUBE.

Figure 3-Radiotron Socket Voltages, and Location of Parts 25 -Cycle Operation

For 25 -cycle operation, connect a 16 mfd., 150 -volt dry electrolytic capacitor (Stock No. 81323) from the cathode of the rectifier tube to chassis. (Positive to contact Kl of 25Z6 -G, and negative to shell contact of 617 r -f socket.)

RCA PAGE 9-113

MODEL 8K Saheme.tic,Socket Trimme.rs,Specs.

bob b aaa ci 0 0 0

Ó,d p N co co co ...iO.... ' . . v 0 V i d ÿ Ñ

O b 0 > ú ÿ Ú

bNb .. V


j'AGE 9-114 RCA liDDEL 98B Voltage,Lead Dress Chassis W r ing,Notes Transfarmera

Service Data Loudspeaker.-Centering of the loudspeaker is made in the

usual manner with three narrow celluloid or paper feelers after first removing the front dust cover. This may be removed by softening its cement with a light application of acetone, using care not to allow the acetone to flow into the air gap. A dust cover should be cemented jp place upon completion of ádjustment.

Precautionary Lead Dreg.-(1) The lead from the left pilot light should be kept behind the bulb and toward the "Magic Eye," to keep it away from the 6F5 grid cap, (2) leads from mica trimmers to coil should be kept away from the coil and other parta, (3) leads on oscillator coil which are an extended part of the coil winding should be as short

RCA MFG. CO., INC.

M0113A

NA NIDrG

M0113A

M0113A

asa so a.L 03a- 'al D' 1B

o f

s possible, (4) "C" band series capacitor C31 must have leads as short as possible, (5) all leads from antenna board to antenna coils should be dressed toward back apron, (6) the one lead of the line cord and the primary lead of the power transformer which run to the power switch should be twisted together, (7) shielding on leads to Victrola switch should be kept away from the switch terminals and jack.

Victrola Attachment.-A jack located near the "Magic Eye" tube is provided for connecting a Victrola Attachment into the audio -amplifying circuit. The cable running from the Victrola Attachment should be terminated in a Stock No. 31048 plug to fit the jack.

a

F

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m

bb 13

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RED - SLACK (TAPED)

ROTC INSERT CONNECTOR

ATEE/TIAN° COMMON

CORRESPONDING SUPPLY RAGT NG IReNe


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a

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I=

GREEN - RECT. F.

GREEN - BROWN-

RECT

B LACK-BRORw

-BROWN -- S LOE -

AMG.FI. B LUE - YELLOW -

MOTO« -.02-L -YELLOW -

BLACK -

YELLOW

Above - Universal Power Transformer Connections. (110 -volt supply for a Vic - trola Attachment may be obtained by connecting the motor to the red and the red -

black leads.)

t o RCN

RROWN- Above - Connections and

Colors of Loudspeaker and Cable.


RCA PAGE 9-115 MODEL 98K Electric Tuning Notes Mechanism,Adjustments



116 RCA MODEL 98K Alignment ,Parts Antenna Data

RCA MFG. CO., INC.

Steps Connect the high side of test -oscillator to - Tune test-

oscillator to - Range Selector

Set tuning an: to-

Adjust the following for mu. eak ou ut

No. 1 - . gn cal' In serles with .01 mfd. 455 kc "A' Quiet point

between 550-750 kc

10, 11 (2nd I -F Transformer)

No.2 BAS Det. grid cap in series with .01 mfd

456 1. «A« Ls, L9 (1st I -F Transformer)

No.s AS. Connect Al to chassis. 20 me «C., 20 me

(147.5°) C24 (ose.)

CB (det.)t

No. 4 A2, in series with 100 mmfd. Connect AS to chassis.

8,100 kc "g 6,100 kc (1465°) C26 ()me

No. 6 A2 in series with 100 mmfd. Connect AS to chassis.

1,500 kc Â^ 1,500 kc (151.5°)

CZ9 (nee.) CS (ant)

No. 8 A2, in series with 100 mmfd.

Connect AS to chassis. 800 lee Â" 800 kc

(29.6°) L17 (osa)

No. 7 AI, in series with 100 mmfd.

Connect AS to chassis. 1,500 kc "A" 1,600 kc (151.6°)

C29 (ose.)

s rg :t.2.4 3 V >11 .21,9,x

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1s

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m3 St 9 G

5 " i V.8 v T C

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111::"2:.3:12

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'-. C Sr E.1 L i2 P-U v .2 -61,i VI Cxáá

el c <EáoVY ;3 <q s2(j2

C v eY` úBc Use minimum capacity peak if two peaks can be obtained. Check o determine that the correct peak has been usetly <

E F+'ó,00C

eu 8:-2i

w by turning to 141.5° (19,090 kc), at which point a weaker s gnat should be received. ' ;9: Use minimum capacity peak if two peaks can be obta ned. Check to determine that the correct peak has been used O 4,74 ^ .

« ö É ó ú ^ c É

by turning to 124° (5,190 kc), at which point a weaker signal should be received. C `Ê< 4'2

Y G Cfi 8 t R k d d't peas 'f two pe ks can be obtained with CA C ÿ s c ii

Ell.:

E Y ó.¿c Cós- C 55'ó >?.^, c°>,5m' z G ,. s.. a- c s <`«s o

l' -g.2 á'ó?óÿGÇ^ 1121;

N wC p i sgSS .. .. jn ̀

n v ef.D < y v. D C.c s'1 arGt c s 1 s_ä G 3:18-i

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STOCK No.

gang condenser an use maximum Capacity

DESCRIPTION Li" prja

+

STOCK No.

a

DESCRIPTION Unit Lit Price

RECEIVER ASSEMBLIES 31364 Socket -Dial lamp Becket .40

31261 Board -Antenna and round teentinal board.... .26 13871 31461

Socket -"Manic Eyre Becket Socket -Toone ton wicket*

A5 .90 91449 to nisei body, Im contact Boer, 91985 dockst. SpckN-Tuning ivditats lamp tip .01

14714

springg voc and tip sprint

Ca(C211) Adiusta ble trimmer, 2-12 mmfd. 18 31293

12007 Spring -R tainngttinricgnt tip wring Spring -Retaining pro[ /or C.O. Stock No.

.01

81º92 Capacitor. -Dual adjuatnble trimmer, 3.50 maid. .60

312302202

512[9 contact body eprStuck Spring-Station-timingensnwring

.02

31º62 each section (C24. C25)

Capacitor -Adjustable trimmer, 5-80 meld. (CO) .40 .25

31º6º 8p 31º60

Temion sprint la ire, Stock No. .03

.01 12496 Capacitor -16 mmfd. (CI, C6{) .35 32142 Spring-Tmoion spring for Bywbm .01 31432 12948

Capacitor -20 mmfd. (C27) / Capacitor -33 meld. (C1)

.40

.35 31244 Support-Vnnable condenser motor mounting

support and etude -for 60-40 cycle mode. 12720 31270

Capacitor -100 meta. (COO) Capacitor -100 mmfd. (C11. C12, C13, C14)

-.36 .35 31246

ovary Support -Variable denser motor mounting

45

12724 14726

Capacitor -12o mmld. (Cl?. C38) Capacitor -150 mild. (C16)

.36

.36 suppoet and studfAdor 2 model. only. .70

31033 91453 Capacitor -600 meld. (Cº1.) .35 91438

unecycle

Support -Nana is denser ¢rin gear mown - ' g and Rub .60

31406 Capacitor -1.500 mad. (C2s) Capacitor --6,00o mmfd. (C31)

.36

.75 31º48 31248

52)asea

-iconintone

Tone Switch -Range twitch (Sl, n Tone Control -H .4. rove contra? n d poem'

.96

0548 6393

Capacitor -.007 m)d. (C18 C91, C{o) Capxnor-.0o7 mud. C)

25 .30 91í1e7

switch 24) Dint W tramtormet (1.8. 1.6, Trcii, 3.60

11395 11918 93ee 4739

Capacitor -.01 mfd. (C6 C21, C39, C59, C63). Capacitor -.016 m1á. Cs)8) cawe;+or-.o6 add. (c9) Capacitor -0.1 ofd. (C10, 018)

.80

.40

.ºo oto

31268 Transformer--Seco¢d H tranalormu (lelo, LIl, C33, C14)

2.20

º.oa 12464 30867

Capacitor -.0.25 mid. (C33, COO) Capacitor -0.5 mkt. (C19)

.8Ó

.80

31899 Tr 225-60 ci-Powu transformer, 106.1!0 .o)o cycle (Ti) 10.56

11403 6219

Capacitor -10 mid. (C34) Capacitor -16 mid. (C16)

1.16 1.86

31493 T 00400aformer-Power

eraWoemu, 106.140 .olts,

((RO) 31537 Clutch -Variable condenser drive gear clutch and pinion tear --engage pin on rooter shalt

31424 Vdume Coñvdle -

SPEAKER( ASSEMBLIES 1.60

(60-80 cycle mode. ode) .36 -F3) S164á Clutch -Variable condemer drive gear dutch and 13935 Cap -Duit cos for cantos .28 pinion gear -en [e pin on motor shaft (28-

cycle models only) n .46Coil-Field 12012 11930

Coil -Field coil (L19) Coil -Hum neutralising coil (L14)

5.90 .30 31593

31296 Coil -"A" band antenna coil (LS. L6, L7).... Coil -"A" band mediator coil (L17)

1.30 1.05

91976 31302

Cone -Souks and voice coü (L13) Plug -a -contact male lug

1.76 .25

91294 37496

Coil -"B" band antenna coil (L3. LO) Coil -"B" and 'C' band emulator coil (L16,

.60 31300 14368

Speaker -Speaker complete crew, washer, and lorkwber to held Screw--SS a

10.95

31297 31290

Coil -"C" band antenna coil (LI, LI) Cmdeme-3-gang variable condenser (C3 CO

C7. C8, C32)

a6 .80

655 14357 14357

ants m yoke t

to Wnndo-Spring co Wubsr-Spring wisher to hold fiert tail field

.70 1.06

.06

31231 Contact -Contact tip for setionyatting contact. .0e MISCELLANEOUS ASSEMBLIES 31280 Cor d(o core and dead for A" baud

oscillator coil 81303 Bracket -Band indicator mounting bracket mm - 31º69 Cor core re and stud for i4 tram- formers.16 Die[ on band indicating strip, cord

pring .40 71273 31440

Drum -Indicator driverot drum heel -Variable coedmser drive motor fly, Flywheel -Variable

heel

.60

.25

31982

91945

Bracket -"Manic Eye" bracket and holder Button -Station selector switch pink button. Carina -Push button meth contacte -comprit

.22

.15

31º36 Gear -Variable condenser intermediate drive gear and pinion near (60-60 cycle model. only)... 60 31344

inn 30 ecte riveted r¢ insulating sMv Contact-Pwh button a tch corium -con .70

31846 Gear --Variable condenser intermediate drive gear d piniongear (46<yde models only) .40 31278

pritinn 39 contact. 'vatw on imulet.g min. Cord -Rani icator drive cord

1.20 .12

31239 Gear --Variable condenser knob shaft drive gearand

hub .as 51º61 31483

Cord -Indicator pointer drive cord Cord -Variable condenser drum drive cord

.60

.20 Lamp -Did Iamb 17 41464 Cover -Eight protective coven for posh butte

r. 11480 Lamp -Electric tuning adjmtnrmt indicator Wrap 2e 31309 Cuakion-Station selector push button rubber .08

31243 JIº93

Leather -Friction leather for flywheel Motor-Variable«4condenare drive motor (MI)- .04

31451 cushion

Dial -Station selector dial and areal ,Ot .95

31º36 Motor-Vemable only

drive motor (M1)- 6.60

31356 Exntchmn-Station e)xerr dcci eerrtehem

31228 60-60 cycle node. only

Platt-Sn r tioneettieg contact plate ern- 4.88

31304 only -)es dial and puck button.

Indicator -Band indicatortrip 3.66

.16

31527 tun

Plate-Stationeettmg contact mounting plate - 46 31306 Indicator -Station selector indicator pointer and wo

6060 mounts on rear of variable condenser

Plug -4 -contact female plug for speaker cable .50 .30

61Jú6 I[nob--Rana .wie«h..pWme control. tree con- trot or station selector knob .12

31271 31272

Paley -rotor Dinky Pulley --Range switch pulley

,pa .40

31346 Lock-Pueh button switch lock plate--compr - leg 10 contact locks in one strip .80

14560 31431

Reimer -18 ohms, } watt (R19) Rejator-220 ohm, wire wound. 1.5 watts

.20 31458 53467

Marker -'D.1 Tuning' e ll button marker... Parker -"Record Player' push button marts..

.01

.Ol

31430 (R26)

R.s,tor-5,200 ohm, wire wood. 1.6 ware .18 91589

91860 Markers -Station call latter markets Pulley -Indictor pointer drivecord Dpol,

.36

.10

14284 Resistor -22,000 - hmm, 1/10 wan (54) ohm, .02 14887 Retainer -Indicator pointer drive cord pulley re

+atêr .O3

14167 Resistor -º7,000o ºBeat. (R53) .15 .10 31306 Screen -Station w m end dial color seed

11300 Reaktor -33,000 oh, 1/10 watt (RO. R117,39º3 Screw -Not N us6-32 moue head wt screw for '4ohm,

12010 Enamor -64000 ohm., 1/10 watt (529) porter slide stop .06 11398 Be.tor-5:40,000 ohm, 1/l0 watt (Rio)....

.16

.16 11210 Screw-Chusv counting acrewd, w.dben, and lot-ledin for one Marie .05 12244

11497 Reistor -440,000 ohms, } watt (Rot) Reidtor-430,000 ohms, 1/10 wan (Rio)

.20

.18 31287 31347

Shaft -Indicator pointer lido shaft Socket --Pickup socket and bracket

.15

.30 11482 14013

Resistor -470,000 ohm, 1/10 watt (Si. R8).. Reistor -1 mug., 1/10 wan (R7, 550)

.16 13038 Spring -Indicator pointer drive cord mason 6131 Resistor 2.2 meg., 1/10 watt (R3)

.16

.16 31418 Sprung -Variable drip .08

91439 Rotor -Selector rotor dime -mounts on rear of sh variable rondenur alt 1.18 16270

modem.. cord tendon

Spring -Retaining Retaining opting for knob, Stock No. 06

31241 Screw -it x 20 needles, cam print set xrew for .02 31213

31366 Spring -Tension wring for band indicator

.06

.03 14350 Screw-No.é 332 square hew sot screw for et 31313 span[-Tmaien spring for push bane twitch 4119

later Cam Screw --No. 8-32 headline sat screw for gear,

.03 31307 Stop-Indicatorlepointer slide stop .30

4866 Stark No. 31239

Screw --No. 8-34 square heat set acrew for peal- .02 31360 Seetcn-Pickup switch for mounting on push

button switch assembly (S3) 2.70 ley, Stock Nog. 31471 and 31272, and drum, 31312 Switch -Station selector push button switch and Stock No. 61273 .03 bracket complete 4.28

ALL PRICES ARE SUBJECT 'TO CHANGE OR WITHDRAWAL WITHOUT NOTICE

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Figure 7-Station-Setting Contacts and ARMCHAIR Selector Disc CONTROL

UNIT This illustration shows connections for a G8A Armchair Control Unit. This unit is not supplied with the receiver but may be added as

an accessory.

SOLDER TO STATION - SETTING CONTACTS

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Color of Lead Station To Station -Setting Button Contact No. 1 Black No. 2 Brown No. 3 Blue No. 4 Green No. 5 Red No. 6 Red -black No. 7 Brown -black No. 8 ..... Red -yellow

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Service Data Loudspeaker. -Centering of the loudspeaker is made in

the usual manner with three narrow celluloid or, paper feelers after first removing the front dust cover. This may be removed by softening its cement with a light application of acetone, using care not to allow the acetone to flow into the air gap. A dust cover should be cemented in place upon completion of adjustment.

Victrola Attachment. -A jack located near the "Magic Eye' tube is provided for connecting a Victrola Attachment into the audio -amplifying circuit. The cable running from the Victro a Attachment should be terminated in a Stock No. 31048 plug to fit the jack.

RCA MFG. CO., INC.

Lubrication

Motor beatings and gear bearings; use light machine oil.

Gear faces; use "Pure Oil No. 611" or petroleum jelly.

Dial -indicator pulleys and rails; use "Castordag" or petroleum jelly.

Selector disc; apply thin film of petroleum jelly.

Friction leather on flywheel; apply "neatsfoot oil. When replacing leather, soak it for at least 24 hours in neatsfoot oil, and insert in flywheel while dripping.

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Unit List Price


Unit List Pries

RECEIVER ASSEMBLIES 12724 Capacitor -120 mmfd. (CS7, C38) .35 31253 Board -Antenna and ground terminal board... .116 12725 Capacitor -150 mmfd. (C36)) .96 31229 Body -Station -setting contact body, lee contact

tip and tip spring .18 53439 31033

Capacitor -560 mmfd. (C28) Capacitor -1,600 mmfd. (C26)

.

.3636

12714 31292

Capacitor-Adjurtable trimmer 2-12 mmfd. (C99) Capacitor -Dual adjustable trimmer 9-90 mmfd.

1.60 91406 30309

Capacitor -8,000 !d. (CSS) Capacitor -.00911 mid. (C46)

.75

.40

each section (C24, C25) .40 4838 14393

Capacitor -.006 m(d. (C37, C22, C49, C50).. (CB C38, C CaCp52, 83, C39,

.25

31252 Capacitor -Adjustable trimmer 6-80 mmfd. (C5) Capacitor -15 mmfd. (CI, C54)

.25

.85 11315

tor -.01 mid.

Capacitor -5Ä1S mid. (C36) AO .20

12948 Capacitor -S3 mmfd. (Cl) .35 30882 Capacitor -.05 mid. (C9) .40 31492 12720

Capacitor -20 mmfd. (C27) Capacitor -100 model. (COO)

.40

.95 4839

30985 Capacitor -0.1 mid. (C10, C18) Capacitor -0.26 nild. (C33, C.0, C47)

.30

.30 31270 Capacitor -100 mmfd. (C11, C12, C13, C14).. .35 30887 Capacitor -0.5 mid. (C39) .30

6212 Capacitor -is mid. (C36) 1.36 SPEAKER ASSEMBLIES 14631 31237

Capacitor -25 mid. (C34) Clutch -Variable condenser drive gear clutch and

1.55 (Speaker RL -83-H4) Model 99T

31544

pinion gar -ngag` pin on motor shalt (50/80 ycle odehes only)

Clutch -Variable condenser drive gear dote!, and .9b 19358

13866 Board -3 -contact reproducer terminal board... Cap -Cone center dust u D

.15

.25 pinion gear -engages pin on motor shaft (26 cycle odeis only) .46

11254 11469

Coil -Field coil (L32) Coil -Hum neutralizing coil (L14)

9.86 .30

53299 31298

Coil -"Am band antenna coil (Lb, L6, L7).... Coil -"A" band mediator coil (L17)

1.90 1.05

31310 6099

Cone -Speaker cone and voice coil (L13) Plug -6 -contact male plug for speaker

1.76 .30

31284 51286

Coil -"B" band antenna coil (L9, L4) Coil -'B" and "C" band oscillator coil (L16,

.36 31309 14369

Speaker -Complete Screw -Screw, washer, mid lockweher to told

in

11.20

31297 Coil- L18'C"

band antenna it (L3, L2) g0 14534 Transforme.85 core

r --Output transformer (T2) 995 31290 Condenser -3 -gang variable condaser (C3, C4, 14357 Washer -Sprint washer to hold field coil .08

C7, CO, C32) 6.60 SPEAKER ASSEMBLIES 91231 31289

Contact -Contact tip forstation-netting contact Core -Adjustable con and stud for -t trans-

.08 (Speaker RL -70-112) Model 99K

31260 Core --Adjustable core and stud for "A" band 16

15886 Cap -Duet capfor a cater .03

31273 oscillator coil

Drum -Indicator drive cord drum .35 11234

11469 Cal -Field 1 (L12) Coil -Neutralizing coil (L14)

9.85 .30

31240 Flywheel -Variable condenser drive motor fly- .80

91275 Cone -Speaker cone and voice coil (LIS) 1.75

31239 wheel

Cur -Variable condenser knob shaft drive gar .25 6039

31590 Plug---4-contact male plug for speaker Speaker -Complete

.30 12.36

91438 and hub

Gear-Variableyy condenser intermediate drive .65 14394

14357 Trasfonoern-Output transformer (T2) Washer -Spring weber to hold field coil securely

9.86 .06

31545 S

GeasaVnrcikl eeonám0:e8r0intérrlmeáiaa árively`ear 60 SPEAKER ASSEMBLIES

11891 and pinion gear (25 cycle models only)

Lamp -Dial lamp .40 .17

(Speaker 5L70 -E2) Model 99K

31480 Lamp -Electric tuning adjustment indicator lamp .20 13868 Cap -Dust cap for cone center .09 31243 31248

Leather -Friction leather for flywheel Motor -Variable condenser drive motor (M1)-

.04 11234 11489

Coil -Field coil (L12) Coil -Neutralizing coil (L14)

3.86 .90

31235 25 cycle models only

Motor -Variable condenser drive motor (Ml)- 6.50 12867 5039

Cone --Speaker cone and voice coil (L1S) Plug -4 -contact male plug for speaker

1.95 .30

31229 50/80 cycle modal only

Plate -Station -setting contact plate -less contact 4.85

.45 14535 14358

Speaker -Complete Screw -Screws, washers, and lockwashen to hold

12.90

31227 Plate. -Station -setting contact mounting plate- mount. on of variable condenser .50 14534

core inyoke TransformerOutput transformer (T2)

.04 3.85

5040 91271

Plug -4 -contact female plug for speaker cable.. Pull pulleya

.30 14357 Washer -Spring washer to hold field coil .08

31274 31250

Pulley -Range Range itch pulley Resistor -Voltage divider comprieing one 1,500

ohm, one 2,950 ohm, one 3,400 ohm, 12

20 31303

MISCELLANEOUS ASSEMBLIES Bracket -Band indicator mounting bracket corn -

pinte less indicator strip, cord, and tension ohm, and one 180 ohm sections (R19, R28, 531, R32, RS3) .90 31276

spring -Model 99K Bracket -Band indicator mounting bracket con.

.40

14284 13998

Resistor -22.000 ohms, 1/10 watt (R24) Resistor -22,000 ohms, } watt (R4)

.15 .20

Pete Ims indicator strip, cord, and tension spring -Model 99T .40 11300

12454 Re.iator-33.000 ohms, 1/10 watt (R27, R30) Resistor -33,000 ohms, } watt (R8)

.15

.20 91282 91958

Bracket -Magic Eye mounting bracket and holder Button -Station selector posh button

.22

.15 11281 14580

Reistor -100.000 ohma Resistor -100.000 ohms

1/10 watt (R34).... } watt (B9ó)

.15

.20 91346 Contact -Push button awrteh cone eta--compris-

ing 10 contact. riveted on insulating strip. .70 11398 14284

Resistor -220,000 ohms Reaistor-220,000 ohms

1/10 watt (R14, R36) } watt (RS)

.15

.20 31344 Contact -Push button switch contact.-oom ris -

ing 19 contacta riveted on insulating strip.. 1.20 11453 11452

Raiator-470,000 ohms Resistor -470.000 ohma

1/10 watt (R16, R29) 1/10 watt (R1)

.15

.15 31278 91281

Cord -Band indicator drive .ord Cord -Indicator pointer drive cord

.12

.60 12485 12019

Resinor--470,000 ohms Resistor -1 meg., 1/10

} watt (Rs) watt (R7, R4s)

.20

.15 31293 31456

Cord -Variable condenser drum drive cord.... Cover -8 protective coven for push button

.20

31056 5191

Resistor-1.2 meg., 1/10 watt (R24) Reistor -2.I meg., 1/10 watt (53)

.15

.15 31359 Cuahion-Station button .08

31233 Rotor -Selector rotor disc -mounts on rear of selector plats rubber

cushion .08 31241

variable denser haft Screw -fl 20 headlea ccne point set screw

1.16 31451 31356

Dial- a Station selector dial scale d crystal... Escutcheon -.-Station selector did tcheon-

.96

4119 for flywheel

Screw -No. 8-32 headless set screw for gear .02

31381 less dial ensile and push buttons -Model 99K

Escutcheon -Station selector dial tcheon- 2.85

14360 Stock No. 31239

Screw -No. 8-32 square head set screw for .02

31304 less dial male and pink buttons -Model 99T

Indicator -Band indicator strip 8.20 .15 selector rotor disc .03 31905 indicator -Station selector indicator pointer... .40 4688 Screw -No. 8-34 square head ecru, r for

pulley Stock Nos. 31271 and 31272, and drum 31355 Knob -Range switch, volume control, tone con -

trot, or station selector knob .12 Stock No. 31273 .03 31348 Lock -Push button twitch lock late-cu u- mpr 31964 19871 31251 91985

Socket -Dial lamp socket Socket-Magipo Eye socket Socket-Radiotron socket Socket -Tuning indicator lamp insulated socket

.20

.46

.25

.30

31589

31457

ing 10 contact locks in one stop Markers -Station call letter markers for push

s .

Markerr"Record Player" for

.80

S6 31232 Spring -Contact tip spring for station. setting

marker push button .01 contact .01 31458 Marker -"Dial Tuning" marker for push button .01 12007 Spring -Retaining spring for core Stock No.

31269 .02 31280 14887

Pulley -Indicator pointer drive cord pulley.... Retainer -Indicator pointer drive cord pulley re -

.10

31262 31230

Spring -Tension spring for core Stock No. 31260 Spring--Station-setting contact body spring

.01

.01 31308 tainer

Screen -Station »lector did color screen end .01

31242 Spring -Tension spring for flywheel .01 light diffuser .45 31236

31244

Support -Variable condenser drive gear mount- supporting studs

Support -Variable condenser assemblyotor

mounting .65

11410

3093

Screw -Chaule mounting screws washers, and

Screw -No. 8- 32 square had set screw for .06

31245 support and studs for 50/80 cycle models only

Support -Variable condenser motor mounting .45

31287 pointer elide stop

Shaft -Indicator pointer elide shaft .05 .15

31291 support and studs -for 25 cycle model.....

Switch -Range switch (Sl, S2) .70 .95

91917 31279

Socket -Pickup socket and bracket Spring -Band indicator tension spring

.30

.03 31249 Tone Control -Hi. tone control and power 13838 Spring -Indicator pointer drive cord tttelon 91287

twitch (R32. 84) Transformer -pint 1-f transformer (Le, Le,

1.50 31418

spring Spring -Variable tenderiser dam drive -cord ten -

.O8

31288 C11, C12)

Transformer -Second i -f transformer (L10, L11, 2.20

14270 Mon spring

Sprint -Retaining spring for knob Stock No .05

91908 C13, C14)

Transformer -Power transformer 105-130, 140- 2.05

31319 31355

Spring -Tension spring for push button twitch .06

81228 180, 200-250 volts, 50-80 cycle (T1)

Transformer -Power transformer 110 volts, On- 13.85

31307 latch bar

Stop -Indicator pointer slide stop 08

.30

31225 80 cycle (Ti(

Transformer -Power transformer 110 volts, 50 13.00 31312 Switch -Station selector push button switch and

bracket complete 4.25 31450

80 cycle (T1) Volume Control (R9)

8.60 1.50

91360 Switch -Pickup switch for mounting on push button switch assembly (89) 2.70

RCA PAGE 9-121

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MODELS U105,U107 Schematic

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122 RCA MODELS U105,U107 Circuit Data,Lead Dress Pick-up Data,Speos

RCA MFG. CO., INC.

General Description The Model U-107 combination instrument consists of a

ten -tube, three -band, "Magic Brain," superheterodyne receiver and an automatically operated phonograph combined in a console -type cabinet. Features of design include an r -f amplifier stage, "qumulative-wound" antenna and r -f transformers for high signal-to-noise ratio in "A" Band; magnetite - core adjusted i -f transformers and low -frequency "A" oscil- latór tracking; automatic volume control; plunger -type, air - dielectric trimming capacitors; "Magic Eye" tuning tube; aural -compensated radio and phonograph audio -volume controls; three-point tone control; audio phase -inverter voltage

amplifier; push-pull power -output stage; crystal pickup; improved super -sensitive dust -proof electrodynamic loudspeaker; and the "Sonic -Arc" Magic Voice. The record changer may be operated automatically or manually on both 10 -inch and 12 -inch records.

The Model U-105 combination instrument consists of a

similar radio receiver combined with a smaller automatically operated phonograph. This record changer will change seven 10 -inch records or repeat 12 -inch records automatically. It may be operated manually if desired.

Service Data The various diagrams of this booklet contain such infor-

mation as will be needed to isolate causes for defective operation if such develops. The ratings of the resistors, capacitors, coils, etc., are indicated adjacent to the symbols signifying these parts on the diagrams. Identification titles such as R1,

LI, Cl, etc., provide reference between the illustrations and Replacement Parts List. The coils, transformer windings, and reactors are rated in terms of d -c resistance to permit con tinuity checks.

Loudspeaker.-Two types of loudspeakers are used which will be referred to as types 1 and 2. In type 1 the cone centering diaphragm is cemented to a fixed ring, while in type 2 the centering diaphragm is cemented to an adjustable ring. Replacement of cone for either type is identical. Center- ing of cone for "type 1" loudspeaker is made with three narrow celluloid or paper feelers after first removing the front dust cover and cutting free the cone centering diaphragm. The dust cover may be removed by a light application of acetone, using care not to allow the acetone to flow into the air gap. The centering diaphragm should be cemented in place after placement of feelers. Sufficient time should be allowed for the ambroid to set before removing feelers. Use ambroid to replace dust cover: Centering of cone for "type 2" loudspeaker differs only in that it is not necessary to cut free the centering diaphragm, adjustment being made in the usual manner by means of screws on the adjustable cone centering ring.

Precautionary Lead Dress.-(1) Keep leads to a -c switch dressed away from antenna coil and trimmer C2. (2) Keep all filament leads twisted. (3) Dress shield lead from term. E of 2nd i -f transformer to term. board against side of chassis and away from 6L7 socket. (4) Dress shielded lead from 6N7 socket to volume control against side of chassis and away from 6L7 socket. (5) Shielded lead from phono. term. board to volume control must be dressed under bus connected between 6L7 and term. A of first i -f transformer. (61 Keen leads of C21 as short as possible. (7) Yellow lead

POWER SUPPLY RATINGS Model U-105 A-6...105.125 volts, 60 cycles A.....105.125 volts, 50-60 cycles B-2...105.125 volts, 25 cycles C-6 ...105-130/140-160/200-250 C..... 105-130/140-160/200-250

tróm 15J7 oscillator cathode to dúmmy terminal on 6L7,socket múst be dressed away from chassis base ana from brown filament lead. (8) All molded capacitors should be dressed so that flat side is perpendicular to chassis base. (9) Yellow lead from cathode of 6J7 socket to term. 22 of S2 must be dressed under spaghetti on 6J7 socket jumper and pulled tight away from chassis. The following bus leads should be kept as short as possible and, when necessary, replaced only with wire having same diameter as original: (10) Lead from L11 -L12 -L13 to ground lance; (11) Lead from term. 13 of S3 to ground lance; (12) Lead from term. 9 of S3 to L6 -L7; (13) Lead from L6 to C&; (14) Lead from C9 to C8; (15) Lead from term. 5 of SI to ground lance; (16) Lead from LI -L2 to term. 4 of S1; (17) Lead from LI to Cl; (18) Lead from term. 21 of S2 to C19. (19) Keep filament leads dressed away from grid prongs of 6N7. (20) Keep blue and green É 2 Q leads from plate prongs of output tubes twisted their entire length.

Pickup (Model U-107) O O

An adjustment is provided to compensate 'for possible re- c c duced sensitivity of the crystal pickup with age. Adjustment requires the use of a 1,000 -ohm -per -volt a -c voltmeter (ree- 222 tifier type, 10 -volt range), a 1-meg. resistor, and an RCA . ó Victor Technical Purpose frequency record (Cat. No. v v 84519-A or 84505-B). Disconnect the green lead from ter- o minal "1" (terminal board marked "1," "2," and "3" located zZZ on top right-hand side of chassis), connect the 1-meg. re- e m e sistor between green lead and terminal "1," connect the volt- U meter across loudspeaker voice coil, turn "Phonograph. Volume" and "Power -Tone" controls extreme clockwise, turn "Phono -Volume" (radio) control extreme counter -clockwise, and adjust R114 ("Pickup Voltage Adjuster," mounted under right-hand end of motor -board) until either of the above - mentioned frequency records gives a voltage reading of 6.8 volts using 400 -cycle section of record. R114 should also be adjusted if pickup is replaced.

Radio only Total 135 watts 165 watts 135 watts 165 watts 135 watts 165 watts

volts, 60 cycles 135 watts 165 watts volts, 50-60 cycles 135 watts 165 watts

Model U-107 A-6...105.125 volts, 60 cycles A-5...105.125 volts, 50 cycles B-2...105.125 volts, 25 cycles C-6 ... 105-130/140-160/200-250 C-5 ... 105-130/140-160/200-250 POWER OUTPUT Undistorted 10 watts Maximum 12.5 watts

Radio only Total 135 watts 165 watts 135 watts 170 watts 135 watts 165 watts

volts, 60 cycles 135 watts 165 watts volts, 50 cycles 135 watts 170 watts

LOUDSPEAKER Type Impedance (v.c.)

PHONOGRAPH Model U-105 Type Automatic -Manual Record Capacity Eight 10 -inch Turntable Speed 78 R.P.M. Type of Pickup High -impedance magnetic.... Pickup Impedance 1,400 ohms at 1,000 cycles..

Electrodynamic 11.5 ohms at 400 cycles

Model U-107 Automatic -Manual Eight 10 -inch or Seven 12 -inch 78 R.P.M. Crystal 80,000 ohms at 1,000 cycles

Mechanical Specifications Model U-105 Model U-107

Height 34 inches 43 inches Width 363/4 inches 3 W inches Depth 15% inches 195/a inches Weight (net) 96 pounds 136 pounds Weight (shipping) 122 pounds 199 pounds Chassis Base Dimensions 14'/8 inches a 93/4 inches x 31/4 inches Over-all Chassis Height 93/4 inches OPERATING CONTROLS

Radio Panel (1) Tone-Power (switch), (2) Tuning (large inner knob), (3) Range Selector (small outer knob, left to right "A," "B," "C"), (4) Phono.-Volume (radio).

(U-105) (1) Turntable Switch, (2) Index Lever, (3) Record Ejector, (4) Phono. Volume (U-107) (1) Turntable Switch, (2) Index Lever, (3) Phono. Volume

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RCA PAGE 9-123

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RCA PAGE 9-125



FACE 9-126 RCA_

MODELS U105,U107 S ooket,Tr inner s

HUGH RRMRTURE CENTRRLLY BETWEEN

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RCA MFG. CO., INC.

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SPEED ADJUSTMENT (SCREW) TO DECREASE SPEED

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DO NOT CHANGE THIS ADJUSTMENT

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Figure 8 -Details of Motor (Model U-105)

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Voltage values as specified should hold within ±20% when the receiver is normally operative at its rated line voltage. To duplicate the conditions under which the voltages were measured requires a 1,000 -ohm -per -volt d -c meter, having ranges of 10, 50, 250 and 500 volts. Use the nearest range above the specified measured voltage. A -c voltages were measured with a corresponding a -c meter.

RCA PAGE 9-127

MODEL U105 Pickup Data

MODELS Ú105,U107 RCA MFG. CO., INC. Alignment

Pickup (Model U-105)

The pickup used in the phonograph unit is of an improved design. The horseshoe magnet is rigidly welded to the pole pieces and is irremovable. There is a centering spring attached to the armature to maintain proper adjustment and to provide a limiting effect on the movement of the armature. The frequency response is substantially uniform over a s 1de range. Service operations which may be necessary on the pickup are as follows:

Centering Armature.-Refer to figure 5 showing the pickup inner structure. The armature is shown in its proper relation to the magnet pole pieces, i. e., exactly centered. When- ever this centering adjustment has been disturbed it will be necessary to remove the pickup mechanism from the tone arm by removing the needle holding screw and the two mounting screws from the front of the tone arm, holding the pickup assembly to keep it from dropping. Unsolder the two leads from the lugs on the terminal board at the rear of the pickup. Insert a small rod or nail into the armature' needle hole and replace the needle holding screw, tightening it to hold the rod securely. If the armature clamping screws A and B have not been disturbed, screws C should be loosened which will permit the armature to be moved from side to side, the rod acting as a lever to perform this operation. The proper adjustment is obtained when the armature is moved to the extreme position on each side (the movement being limited by the armature striking the pole pieces) and then brought to the mid position between these two extremes. Screws C should then be tightened. The armature position should then be central between the pole pieces and at right angles to them. With a little practice, the correct adjustment of the armature will be obtained. The air gap between the pole pieces and the armature should be kept free from dust, filings, and other foreign material which would obstruct the movement of the pickup armature.

Damping Block.-The viscoloid damping block which is

attached to the front end of the armature shank serves as a

mechanical filter to eliminate undesirable resonances and to cause the frequency response to be uniform. Should it be

necessary to replace this damping block, the pickup mechanism should be removed from the tone arm as explained above.

Alignment Calibrate the tuning dial by adjusting main dial pointer

to the low -frequency (end) calibration mark on dial with the gang tuning -condenser plates in full -mesh position; then adjust the small (vernier) pointer to "0." These are friction adjustments.

Perform alignment in proper order, tabulated below, start ing with No. I and following all operations across, then No. 2, etc. Adjustment locations are shown on figures 6 and 9.

Cathode-ray alignment is highly preferable; the connections to the chassis are shown on figures 2 and 3. If an out put indicator is used, connect it across the loudspeaker voice - coil and advance the receiver volume control to full -volume position.

Test Oscillator

Remove screw D and the damping block from the pickup assembly. Make sure that the shaft of the armature which contacts- the viscoloid is clean. Then insert the new damping block so that it occupies the same position as that of the origi nal block, and is in correct vertical alignment with the armature. The hole in the block is somewhat smaller than the di ameter of the armature in order to permit a snug fit. With the damping block properly aligned on the armature, screw D with its washer should then be replaced. Heat should be applied to the armature (viscoloid side) so that the damping block will fuse at the point of contact and become rigidly attached to the armature. A specialtip soldering iron, constructed as shown in figure 7 will be found very useful in performing this operation. The iron should be applied only long enough to slightly melt the block, causing a small bulge on both sides.

Replacing Coil.-Whenever there is defective operation due to an open or shorted pickup coil, this coil should be re placed. Remove the pickup mechanism and terminal board as

described above. Remove screws A and B and the magnet assembly. Remove the Bakelite coil support (with coil at cached) and insert the new coil support assembly in its place, after which replace the magnet assembly and center the armature as described above, then re -assemble the remainder of the unit.

Automatic Record Mechanism (Model U-105)

This record changing mechanism is designed to be simple and fool -proof. Certain adjustments may be required occasion. ally. The adjustments are illustrated and explained in figures 8 and 10.

It is important, when servicing the automatic mechanism, to have it placed on a level support. It is also important to refrain from forcing the mechanism if there is a tendency to bind or jam, since bent levers and possible broken parts may result.

CAUTION.-Do not leave records stacked on the record holder posts, when not in use, as they are liable to warp, particularly so in warm climates.

Procedure Connect the "low" output terminal of the test oscillator to

the receiver "G" (ground) terminal for all alignment operations. Regulate the output of the test oscillator so that minimum signal is applied to the receiver to obtain an observable output indication. This will avoid a -v -c action.

The term "Dummy antenna" means the device which must he connected between the "high" test -oscillator output and the point of connection to the receiver in order to obtain ideal alignment. "No signal, 550-750 kc" means that the receiver should be tuned. to a point between 550 and 750 kc where no signal or interference is received from a station or local (heterodyne) oscillator.



Dummy Antenna

Frequency Setting

Range Selector


Circuit to Adjust

Adjustment Symbols

Adjust to Obtain

1 6K7 I -F Grid Cap .001 Mfd. 460 kc "A" Left No Signal

550-750 kc 2nd I -F Trans. L16 and L17 Max. (peak)

2 6L7 Det. Grid Cap .001 Mfd. 460 kc "A" No Signal

550-750 kc 1st I -F Trans. L14 and L15 Max. (peak)

3 Ant. Term. 300 Ohms 20,000 kc "C" Right 20,000 kc "C" Osc. C20 Max. (peak)

4 Ant. Term. 300 Ohms 20,000 kc 20,000 kc "C" Det. C9 Max. (peak) t

5 Ant. Term. 300 Ohms 20,000 kc 20,000 kc "C" Ant. C2 Max. (peak)

6 Ant. Term. 300 Ohms 6,000 kc "B" Center 6,000 kc "B" Osc. C23 Max. (peak) *

7 Ant. Term. 200 Mmfd. 600 kc "A" Left 600 kc "A" L -F Osc. L13 Max. (peak)

8 Ant. Term. 200 Mmfd. 1,500 kc 1,500 kc "A" H -F Osc. C26 Max (peak)

8 Ant. Term. 200 Mmfd. 600 kc 600 kc "A" L -F Osc. L13 Max. (peak)

10 Ant. Term. 200 Mmfd. 1,500 kc "A" 1.500 kc "A" H -F Osc. C26 Max. (Peak) j' Use maximum capacity peak if two peaks can be obtained. Y Use minimum capacity peak if two peaks can be obtained. $ After this adjustment, check for image signal by shifting receiver dial to 19,080 kc.


128 RCA MODELS Parts

U105,U107 List RCA MFG. CO., INC.

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RCA PAGE 9-131

RCA MFG. CO., INC.

Circuit Arrangement The circuit consists 9f a combined first -detector and oscil-

lator stáge; i -f amplifier stage; diode -detector and automatic - volume -control stage; a -f amplifier stage; a -f amplifier, phase - inverter stage; push - pull power - amplifier stage; tuning indicator "Magic Eye"; and a full -wave rectifier. The antenna coil is constructed with a special type winding ("qumulative") to provide increased sensitivity and selectivity on the "Stand- ard broadcast" band. A fixed -tuned wave trap reduces i -f interference entering the antenna circuit.

Electric tuning is accomplished in a simple manner. There are six trimmers for tuning the single antenna coil and six magnetite -core adjusted oscillator coils. A desired station is tuned accurately, quickly, and silently by pressing a push- button which instantly puts the pre -adjusted coil and trimmer into use. Oscillator frequency drift is reduced to a minimum by use of a temperature -compensating capacitor (C28) in the oscillator circuit along with magnetite -core adjusted oscillator coils.

r

Radiotron Cathode Current Readings Measured with Milliammeter Connected at Tube Socket

Cathode Terminals Under Conditions Similar to Those of Voltage Measurements

(1) RCA -6A8 -1st Det. and Osc 11 ma. (2) RCA-6K7-I-F Amp. 8 ma. (3) RCA -6H6 -2nd Det. and A.V.C (4) RCA-6F5-Audio Amplifier _ 0.29 ma. (5) RCA-6F5,-Inverter 0.29 ma. (6) RCA-6F6-Output 28.5 ma. (7) RCA-6F6-Output 28.5 ma. (8) RCA-6U5-Tuning 1.5 ma. (9) RCA-5T4-Rectifier 110 ma.**

(** Cannot be measured at socket)

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MODEL U106 Soolflet,Trinlmers

Chassis Wiring Circuit Data,Notes

Service Data Loudspeaker.-Centering the loudspeaker voice -coil is

made in the usual manner with three, narrow, paper or

celluloid feelers after first removing the front dust -cover.

This may he removed by softening its cement with a light

application of acetone, using care not to allow the acetone

to flow into the air gap. The dust -cover should be cemented

back in place with ambroid upon completion of the adjust-

ment. Precautionary Lead Dress.-(1) Filament leads should be

dressed away from audio grids. (2) Output plate leads should

be dressed away from radio -phonograph switch. Maintain

original size, length, and position of: (3) All leads from

range switch to antenna and oscillator coils. They should

be as short, rigid, and separated as far as possible from other

l(e)ds and Ls ds from srfroms. (4) Lead

gang condenserto range selector. (6) Leads of "C" -band antenna series condenser, C2. If the r -f and i -f

wiring is altered during servicing the receiver must be re-

aligned.

RECEIVER` TUNING --- AUDIO

R14- DNloCKCT)

RISIf BUTT 0 N i1NT. TRIM ME RS ! ® oO O O©© POWER RECT. L14 tA8 1sxDET -CG2 09 nB CTI(C% Cry SEC.OJ. OSC. 'RANGE S IUNBES 6F5

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POWER UNIT

BOTTOM CDGE ROAR of CHASSIS

Figure 1-Radiotron and Trimmer Locations

POWER SUPPLY UNIT

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Measured at 117 volts, 60 -cycle supply. Measurements made with set tuned to quiet point near 1,000 kc; volume control at minimum; Radio -Phonograph switch to "Radio"; using a 1,000 -ohm -per -volt meter having ranges of 10, 50, 250, and 500 volts. (Use nearest range above the specified

measured voltage.) Measurements made to chassis unless

otherwise indicated.

Note.-Values with star (*) are operating voltages. Values

not starred are actual measured voltages.



j'AGE 9132 RCA MODELS U106,11107 Automatic Record Changer Adjustments, Views,Turner



RCA PAGE 9-133 MODEL U106 Aligmx nt,Parts Transformer Data

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PAGE -9-134 RCA MODEL U109 Cirouit Data RCA MFG. CO., INC.

Circuit Arrangement The radio receiver circuit consists of an r -f amplifier stage,

first -detector (converter) stage, separate heterodyne -oscillator stage, oscillator control stage, two i -f amplifier stages, diode- detector-automatic volume and frequency control stage, audio voltage -amplifier stage, tuning indicator "Magic Eye," audio driver stage, push-pull triode power -amplifier stage, and a full -wave rectifier. The phonograph circuit consists of a volume expander stage, expander amplifier stage, expander rectifier, audio driver stage, push-pull power amplifier stage, and full -wave rectifier.

The antenna and detector coils are constructed with a special type of winding ("qumulative") to provide increased sensitivity and selectivity on the "A" band. The "A," "B," and "C" sections on both coils are wound on single forms and are series connected. The range selector operates in such a manner that the correct portions are selected for the primary and secondary windings on each band. The "A," "B," and "C" oscillator sections are likewise wound on a single form but are connected so they operate separately. Undesirable interaction of unused windings with the tuned circuits is prevented by shorting out the proper sections with the range selector.

The intermediate -frequency amplifier consists of two RCA - 6K7 tubes in a two -stage transformer -coupled circuit. The windings of all i -f transformers are resonated by fixed capacitors and are adjusted by molded magnetite cores to tune to 460 kc. A third winding, L17, in the first i -f transformer, closely coupled to the primary, L15, is placed in series with the main secondary L16 when the fidelity control switch S5 is thrown to "broad" position (see figure 1), thereby increasing the coupling between the primary and secondary circuits with a consequent broadening of the band width of the i -f amplifier, permitting higher fidelity reception.

The function of the automatic -frequency -control circuit is to automatically change the frequency of the heterodyne oscillator so that the correct if frequency is formed for the i -f amplifier. The circuit consists essentially of an i -f discriminator which, as the name implies, discriminates or furnishes control voltage of the correct polarity to an oscillator frequency -control tube for generated i -f carrier frequencies slightly above and below 460 kc, or the frequency to which the i -f amplifier is tuned.

The plate circuit of the RCA -6J7 oscillator control tube is caused to act as an apparent variable inductance in parallel with the "A" band oscillator tuned circuit of which coil L14 is a part. The series combination of resistor R41 and the oscillator control -tube grid to cathode capacitance is also in parallel with the oscillator tuned circuit. Since the resistance of R41 is many times greater than the reactance of the grid - cathode capacitance, at the oscillator frequency, the r -f current through the combination will be practically in phase with the r -f voltage across the oscillator tuned circuit. However, the rf voltage impressed across the grid -cathode capacitance section of the combination will lag the r -f voltage across the combination, or the tuned circuit, approximately 90 degrees. The grid -cathode r -f voltage will be amplified by the control tube but will be shifted an additional 180 degrees (grid and plate voltages of all tubes are always opposite in phase) so that the amplified r -f voltage appearing across the plate circuit will now lead the voltage across the combination or the tuned circuit by 90 degrees, or, in other words, the control tube is acting as an equivalent shunt inductance. The amount of this action is determined by the amplification of the tube, which in turn is governed by the grid -cathode bias voltage. In operation a residual bias is developed across the cathode resistor R43. The d -c control grid voltage is fed to the control grid from the discriminator circuit through resistor R44. If this voltage is negative with respect to ground, the amplification of the control tube will be decreased, the apparent plate circuit inductance of the tube increased, which will lower the frequency of the oscillator tube. The converse will occur when the grid voltage is positive with respect to ground.

The action of the discriminator circuit depends upon the fact that a 90 -degree phase difference exists between the primary and secondary potentials of a double -tuned loosely - coupled transformer when the resonant frequency is applied and that this phase difference varies as the applied frequency varies; i.e., the maximum resultant response voltage across

the primary and secondary windings connected in series will occur at a frequency either lower or higher in frequency than the frequency to which the individual windings are resonated, respectively depending on whether the windings are connected series aiding or opposing.

The discriminator, or fourth if transformer, consists of the primary winding, L24, which is a part of the third i -f transformer secondary tuned circuit (tuned to 460 kc) and the center -tapped secondary, L22. The upper and lower halves of L22 may be considered as two secondary coils, the upper series opposing and the lower series aiding the primary, L24. The magnetite core in L22 is inserted to inductively balance the two halves. The function of coil L23 (magnetite core adjusted), in parallel with L22, is to tune the secondary to 460 kc. Therefore, the maximum voltage will be applied to diode circuit P2K2, R46, and R45 when the i -f signal frequency is above 460 kc and to the diode circuit PiK1 and R20 when the i -f signal frequency is below 460 kc. Resistor sections R46 -R45 and R20 are connected in series between ground and a point leading to the oscillator control tube grid.

D -c voltages, resulting from diode rectification, across section R46 -R45 and section R20 are always in opposition, consequently the oscillator control -tube grid -bias voltage is a differential amount, depending upon the if signal strength and its frequency deviation from the nominal value of 460 kc. The polarity of this differential oscillator control -tube gridbias, with respect to ground, depends on whether the i -f signal frequency is above or below 460 kc, but is always in the direction which will bring the generated i -f frequency nearer to 460 kc. A -f -c action is automatically eliminated for "manual" tuning by grounding diode cathode K1 through switch S7. A -v -c voltage and audio signal components are developed across resistor section R46 -R45. The audio component is taken from R46.

The dynamic volume expander is used with the phonograph so that greater volume -range reproduction may be realized from disc recordings. The gain is varied by means

of the volume expander in direct proportion to the average intensity of the recorded sound. To accomplish this, the expander control R103 in series with R104 and R105 is placed in shunt with the phonograph volume control R108, and the arm of the expander control is connected to the control grid of the RCA -6F5 expander amplifier. The audio voltage applied to this tube is amplified and applied to diode plate P1 of the RCA -6H6 expander rectifier through capacitor C215. The rectified current develops a voltage across resistor R215 which is applied to the No. 3 grid of the RCA -6L7 volumd expander 'and varies the amplification of this tube so that the gain will be increased for loud passages and decreased for soft passages. The volume expander circuit is arranged so that there is no appreciable change of gain, with an average record, between the minimum expansion (second dot) and "Off" positions of the "Dynamic Amplifier" control.

General Description The Model U 1 0 9 Radio -Phonograph Combination

employs the latest developments in the art of record and radio reproduction. Features of design effected in the radio receiver include "Electric Tuning"- with push-button operation; automatic frequency control; "qumulative-wound" antenna and detector coils; tuned r -f amplifier; magnetite -core adjusted i -f transformers and low -frequency "A" oscillator tracking; two -stage i -f amplifier; automatic volume control; "Magic Eye" tuning tube; plunger -type, air -dielectric trimming capacitors, two -point aural -compensated volume control; "Fidelity" control; "Music -Speech" control; and push- pull triode power output stage. Features of design pertinent to phonograph operation include a crystal pickup with top - loading needle socket; improved dynamic expander; automatic operation with either 10 -inch or 12 -inch records; and a separate two -point aural compensated volume control. A super -sensitive 12 -inch electrodynamic loudspeaker with a high -frequency tone diffuser is used. In addition, this model has a cabinet incorporating the "Magic Voice".



RCA PAGE 9-1.3

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136 RCA MODEL U109 R-F Chassis Wiring Coils,Specs. Rating A-6 Rating A-5 Rating B-2 Rating C-6 100-130 Rating C-5 100.130 Fuse Rating.

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RCA MFG. CO., INC. Radio Only Total

105-125 volts, 60 cycles 190 watts 220 watts 105-125 volts, 50 cycles 190 watts 220 watts 105-125 volts, 25 cycles 190 watts 220 watts

/140-160/200-250 volts, 60 cycles 190 watts 220 watts /140-160/200-250 volts, 50 cycles 190 watts 220 watts

3 amperes

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RCA PAGE 9-137

UNIVERSAL TRANSE. CONN.

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SPEAKER CONNECTIONS

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I- U W

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TO A.F.C.-DIODE CATHODE TO ARM OF VOLUME CONTROL riL-DRIVE GEAR TRAIN ENGAGING PIN

© RCA MEG. CO,INC P-84118-0

'ELECTRIC TUNINGPUSH BUTTONS ' MOTOR ARMATURE MOVES Y I MOTOR FORWARD AND CLOSES

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138 RCA

MODEL U109 Voltage,Sooket Tr immer s

RCA MFG. CO., INC.

PHONOGRAPH

Type Automatic Record Ejector Record Capacity Eight 10 -inch or seven 12 -inch Turntable Speed 78 r.p.m. Type of Pickup Crystal Pickup Impedance 80,000 ohms at 1,000 cycles

POWER OuTPuT Undistorted 12 watts Maximum 15 watts

LOUDSPEAKER

Type 12 -inch Electrodynamic Impedance (v.c.) 11% ohms at 400 cycles

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Power Amplifier


Measured at 115 volts, 60 -cycle supply -Tuned to approximately 1,000 kc ("Broadcast") -"Manual" control - No signal being received -Both volume controls minimum -"Dynamic Amplifier" control "off" -

Speech -Music --Phono. and Fidelity controls optional.

Note: Two voltage values are shown for some readings. The value shown in parentheses with asterisk (*) indicates operating conditions without voltmeter loading. The other value (generally lower) is the actual measured voltage and differs from the value shown in parentheses because of the additional loading of the voltmeter.

Voltage values as specified should hold within ±20% when the receiver is normally operative at its rated line voltage. To duplicate the conditions under which the voltages were measured requires a 1,000 -ohm -per -volt d -c meter, having ranges of 10,, 50, 250 and 500 volts. Use the nearest range above the specified measured voltage. A -c voltages were measured with a corresponding a -c meter.


RCA PAGE 9-13f

RCA MFG. CO., INC.

OSC.-C45 OSCrL14 OSCr C51 ANT. -C2 OSC.- C43 6000 K.C. 60OK.C. 1500 K.C. 20,000 K.C.i 20,000 K.C.

DET.- CB 20, 000 K.C.

MODEL U109 S ocket,Tr inner s Current Readings

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TOP VIEW- FRONT OF CHASSIS

MANUAL DIAL LAMP

BAND INDICATOR

Figure 6-Radiotron, Coil, and Trimmer Locations (Receiver)

Radiotron Cathode Current Readings

Measured with Milliammeter Connected at Tube Socket

Cathode Terminals Under Conditions Similar to

Those of Voltage Measurements

( 1) RCA-6K7-R'F' Amp. ( 2) RCA -6L7 -1st Dct. ( 3) RCA-6J7-Osc. ( 4) RCA-6J7-Osc. Control ( 5) RCA'6K7-1st I -F Amp. ( 6) RCA -6K7 -2nd I -F Amp ( 7) RCA -6H6 -2nd Det.,A.V.C. and A.F.C. -ma. ( 8) RCA -6C5 -1st A -F Amp 2.5 ma. ( 9) RCA-6G5-Tuning Tube 2.5 ma. (10) RCA-6L7-Volume Expander 9.5 ma. (11) RCA-6F5-Expander Amp. 0.6 ma. (12) RCA-6H6-Expander Rectifier - ma. (13) RCA-6C5-A'F Driver 2.9 ma. (14) RCA-2A3-Output 43 ma. (15) RCA-2A3-Output 43 ma. (16) RCA-5Z3-Rectifier . 168 ma.**-

(** Cannot be measured at socket)

5.0 ma. 6.0 ma. 8.5 ma. 1.2 ma. 6.0 ma. 7.5 ma.

RADIOTRON COMPLEMENT

(1) RCA -5K7 R'F Amplifier (2) RCA -6L7 First Detector (3) RCA -6J7 Heterodyne Oscillator (4) RCA -6J7 Oscillator Control (5) RCA -6K7 First I -F Amplifier (6) RCA -6K7 Second I -F Amplifier (7) RCA -6H6 Second Detector, A.V.C., and A.F.C. (8) RCA -6C5 First Audio Amplifier

Pilot Lamps (7) Radio

'l (1) Phono Compartment.

3RD I.F. TRANSF.

' 1 _.

1.

TO TERM.

MOTOR TRANSF.

T4

2"a1.F. 0--' TRANSE

\

SEC. ADJ. L21

460 K.C.

- SEC. ADJ. LZ3

460 K.C.

-- DROWN

BLUE

BLACK

BLACK -RED

SEC.ADJ. L19

460 K.C.

__SEC. AD.! L16

460 K. C.

GREEN

REO

STAT ON SELECTOR PUSH BUTTONS

VOLUME EXPANDER

t ÉL 6L7 10

O

4

FUSE 8204 EXPAND.

EXPANDER ,r -..e -B1 BIAS CONTROL AMPL. ) OUTPUT .OUTPUT ,RECT.

o I313) I11 6F5

12

DRIVER EXPANDER RECT.

RCA MFG. CO., INC. TOP VIEW OF CHASSIS

4

Figure 7-Radiotron Locations (Power Amplifier)

6

SN -T62

( 9) RCA -6G5 "Magic Eye" Tuning Tube (10) RCA -6L7 Volume Expander (11) RCA -6F5 Expander Amplifier (12) RCA -6H6 Expander Rectifier (13) RCA -6C5 Audio Driver (14) RCA -2A3 Power Output (15) RCA -2A3 Power Output (16) RCA -5Z3. Full -Wave Rectifier

Mazda No. 46, 6.3 volts, 0.25 amp. Mazda No. 40, 6.3 volts, 0.15 amp.



140 RCA MODEL U109 Lead Dress RCA MFG. CO., Amplifier Adjustment

Service Data The various diagrams of this booklet contain such infor-

mation as will be needed to isolate causes for defective operation if such develops. The ratings of the resistors, capacitors, coils, etc., are indicated adjacent to the symbols signifying these parts on the diagrams. Identification titles such as R1, L1, Cl, etc., provide reference between the illustrations and Replacement Parts List. The coils, transformer windings, and reactors are rated in terms of d -c resistance to permit continuity checks.

Precautionary Lead Dress.-(1) Bus lead from oscillator coil directly to ground must be as short as possible for correct alignment, (2) bus lead from range switch S3 to oscillator section C53 of variable condenser should be 11/2 inches long for correct alignment, (3) bus lead from detector coil to range switch S4 must be as short as possible for correct alignment, (4) bus lead from detector coil to detector section C7 of variable condenser should be 21/2 inches long for correct alignment, (5) detector trimming capacitor C8 lead should connect directly to variable condenser C7, (6) bus lead from antenna section of range switch S2 to chassis ground lance must be as short as possible, (7) bus lead from antenna coil to range switch S2 should be 21/4 inches for correct alignment, (8) bus lead from antenna coil to antenna section Cl of variable condenser must be 37/8 inches over-all with % inch bend at coil end for correct alignment, (9) resistors R13, R41, R43, and R44 in the oscillator control tube circuit must be kept free of other component parts for satisfactory operation of the a -f -c circuit, (10) filament leads should all be twisted to reduce hum pickup, (11) filament leads should be dressed away from the terminal board near the 4th i -f transformer, (12) lead from the range switch S3 to the oscillator cathode socket terminal should be dressed under bus wire on socket to hold this lead down close to chassis.

Loudspeaker.-Two types of loudspeakers are used which will be referred to as types 1 and 2. In type 1 the cone centering diaphragm is cemented to a fixed ring, while in type 2 the centering diaphragm is cemented to an adjustable ring. Replacement of cone in either type is identical. Centering of cone for type 1 loudspeaker is made with three narrow celluloid or paper feelers after first removing the front dust cover and cutting free the cone centering diaphragm. The dust cover may be removed by a light application of acetone, using care not to allow the acetone to flow into the air gap. The centering diaphragm should be cemented in place after placement of feelers. Sufficient time should be allowed for the ambroid to set before removing feelers. Use ambroid to replace dust cover. Centering of cone for type 2 loudspeaker differs only in that it is not necessary to cut free the centering diaphragm, adjustment being made in the usual manner by means of screws on the adjustable cone centering ring.

Dynamic Amplifier Adjustment It is essential that correct voltages and currents exist at

the RCA -6L7 volume expander stage in order that the ex- panding function may take place in the proper manner. A screw -driver adjustment is accordingly provided to regulate the RCA -6L7 control grid No. 3 bias to the correct operating value. Two methods of adjustment are applicable. Either method requires .a normal voltage of 310 volts across the filter output (electrolytic capacitor C220 to chassis). The one to be preferred (a) requires the use of an RCA Stock

INC.

No. 9633 Beat -Frequency Oscillator or the equivalent, a 22 -ohm resistor, two 120 -ohm resistors, and a 1,000 -ohm - per -volt a -c voltmeter (rectifier type) having ranges of 1, 5, and 10 volts. The less accurate method (b) requires the use of an RCA Stock No. 12353 Split -Plate Adapter, and a suitable d -c milliammeter. Both of these procedures are outlined below. It is necessary to turn the "Phono -Music - Speech" control to "Phono" position (clockwise) during this adjustment.

CAUTION: Before using either method, be sure that power -supply fuse is in proper position for the line voltage.

(a) Preferred Method.-Turn power switch off. Connect one 22 -ohm and two 120 -ohm resistors in series between the beat -frequency oscillator terminals (upper "250" and "CT") with the 22 -ohm resistor connected to "CT." Calibrate the beat -frequency oscillator, adjust it to 1,000 cycles, and reduce its output. Connect the 1,000 -ohm -per -volt a -c voltmeter (1 -volt range) to the beat -frequency oscillator terminals (upper "250" and "CT"). Remove male plugs on "Phono Input Cable" and "Exp.-Off Switch Cable" from the apron of the dynamic amplifier (see figure 10). Connect a lead

through a 0.1 mfd. capacitor from the grid cap of the RCA -6L7 (tube No. 10, grid -cap lead in place) to the junction of the 22 -ohm and 120 -ohm resistors. Connect beat - frequency oscillator terminal "CT" to the dynamic amplifier chassis.

Adjust beat -frequency .oscillator output until the voltmeter reads exactly 1.0 volt. Remove the voltmeter leads from beat -frequency oscillator terminals without disturbing oscillator adjustments. Set the voltmeter to its 5 -volt range and connect it across the loudspeaker voice coil.

Set the "Dynamic Amplifier" control to extreme counterclockwise position and "Fidelity" control to extreme clockwise position. Turn on power switch and allow a few minutes for the instrument to become stabilized. Adjust the expander - bias control R204 (screw -driver adjustment top -center amplifier chassis, see figure '7) until the voltmeter reads 2.4 volts.

To check the operation of the volume expander, first change the voltmeter to its 10 -volt range (leaving meter attached to voice coil) and then connect a lead from the junction of the two 120 -ohm resistors to the grid cap of the RCA -6F5 expander amplifier (grid -cap lead removed). The voltmeter should now read from 6 to 9 volts if the expander is operating properly.

After replacing the "Exp.-Off Switch Cable"-plug in amplifier, turning "Dynamic Amplifier" control to "Off" position, removing lead from junction of the two 120 -ohm resistors, and replacing the grid -cap lead on the RCA -6F5 tube, the voltmeter should read approximately 4 volts.

(b) Alternate Method.-Turn power switch off. Place RCA Stock No. 12353 Split -Plate Adapter under the RCA - 6L7 volume expander. Connect a suitable d -c milliammeter to the adapter. Turn both the "Phonograph Volume" and "Dynamic Amplifier" controls to their extreme counter -clockwise positions and remove "Exp.-Off Switch Cable"-plug from apron of the dynamic amplifier (see figure 10). Turn on power switch and allow a few minutes for the instrument to become stabilized. Adjust "Expander Bias" control R204 to give one milliampere of plate current with no signal input to the dynamic amplifier.

Mechanical Specifications Height 43 inches Width 35% inches Depth 227/18 inches Weight (net) 209 pounds Weight (shipping) 297 pounds Chassis Base Dimensions (Amplifier) 16% x 7% x 27/8 inches (Radio) 21 x 10% x 3% inches Over-all Chassis Height (Arllplifier) 8 inches (Radio) 11% inches

Radio Panel (1) Phono-Music-Speech, (2) Volume-Power, (3) Tuning, (4) Range Operating Controls.. Selector, (5) Manual -Electric -Remote, (6) Fidelity

Phono Compartment (1) Phonograph Volume, (2) Dynamic Amplifier, (3) Motor Switch, (4) Index Tuning Drive Ratios (manual) 10 to 1 and 50 to 1



RCA PAGE 9-141

RCA MFG. CO., INC.

ELECTRIC TUNING Principle of Operation

The electric tuning mechanism consists essentially of a

quick engaging and disengaging reversible electric motor, tuning condenser driving gear train, and eight mechanically interlocked (pushing one button releases all others) station selector push buttons respectively wired to eight adjustable station selector contactor discs (each with a motor stopping insulated segment) mounted on a drum which is direct - coupled to the gang tuning condenser shaft. The arrangement permits any one of eight pre -determined stations to be electrically tuned in by merely touching the correct push button.

The operation may be more readily understood by reference to figures 1, 5, and 8. When the motor is not ener gized, the armature is pushed to the rear or slightly out of the magnetic center by tension of contact spring "C" and the motor shaft is dis -engaged from the driving gear train. Pressing in any one of the eight push buttons will complete the motor circuit through a station selector contactor disc, assuming that the "Manual -Electric -Remote" switch is in "Electric" position and that the insulated segment in the contactor disc is not opposite its contactor. As the motor starts, the armature will be drawn forward, due to solenoid action, and the pin "F" on the end of its shaft will engage the arm "G" on the small main pinion gear, thereby driving the tuning mechanism. At the same time contact springs "E" and "D" will be grounded, causing suppression of audio amplification and automatic frequency control during the tuning cycle. The motor will continue to operate until the insulated segment in the selector disc breaks the motor circuit, whereupon spring "C" will instantly dis -engage the motor pin "F" from the arm "G" on the small pinion driving gear and open contacts "E" and "D." Pushing another button will cause the above mentioned cycle to be repeated except that

MODEL U109 Tuner Mechanism Principles,Adjustments

the motor will be interrupted by the insulated segment on a

corresponding disc. The discs are individually adjustable on a drum mechanism, providing a choice of eight "Electric Tuned" "Broadcast" stations. The arrangement of the motor is such that its rotation will continue in the same direction regardless of the number of "Electric" tuning cycles until the tuning condenser approaches either full -out or full -in of mesh, whereupon lever "H" trips switch S9 which reverses the direction of rotation. A throw -out idler gear is link - coupled to the "Manual -Electric -Remote" control to disconnect the motor drive gear train when the control is thrown to "Manual" position.

Mechanism Adjustments The electric tuning mechanism is designed to be as simple

in construction and as fool proof in operation as is possible. In order to maintain the accurate results possible with this device care must be taken in effecting any repairs or adjustments. Reference should be made to figure 8 and the following:

A -F -C and A -F Amplification Suppression Switches.- This switch assembly is located on the motor bracket and closes due to solenoid action of motor armature. Before attempting switch adjustment, loosen "Tilt Compensating Spring" adjusting screws (rear of tuning -motor bracket) and move spring to extreme travel away from motor armature shaft. The tension of the long contact spring "C" is important in bringing about quick disengagement of the motor and in permitting the motor to pull into mesh with the drive mechanism. Normal adjustment is attained when the short springs "D" and "E" are aligned exactly straight with contact points separated approximately 1/32 of an inch and with the spring "C" spaced approximately 7/32 of an inch from spring "D" at the point of contact. If necessary, in order to obtain positive pull -in

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Figure 8-"Electric Tuning" Mechanism Adjustments



142 RCA DEL U109 RCA MFG

and quick disengagement of the motor, the tension of spring "C" should be increased or decreased by bending. This action should be checked with the front apron of the chassis raised two inches higher than the rear. Contacts of the switch must be kept clean. Crocus cloth or a relay burnisher ma be used for this purpose.

tilt Compensating Spring.-The function of this spring is to compensate for the force of gravity, acting to the rear, on the tuning motor armature when the chassis is tilted as mounted in cabinet. The "Tilt Compensating Spring" is located on the rear of the tuning -motor bracket. After com pletion of adjustment "A -F -C and A -F Amplification Sup- pression Switches," raise the front apron of chassis six inches higher than the rear, and then adjust spring by means of its elongated mounting holes until the pin "F" on the motor shaft will pull in and remain in mesh with the arm "G" on the pinion when a push button is pressed. This adjust, ment should be made with the lowest power -supply voltage that will be encountered at the installation.

Motor Reversing Switch.-It is necessary to automatically stop and reverse the drive motor before the tuning condenser reaches the ends of its travel. Approximately 175 degrees of sweep is required, and the reversal must take place above 1,700 kc and below 540 kc but not too near the limits of the scale. The coupling between the station selector drum and the tuning condenser shaft should be attached so that the reversing switch trip lever "H" is exactly vertical when the condenser is full -out of mesh. There should be 1/32 of an inch clearance between the end of the condenser shaft and the selector drum shaft. While the trip lever is in this position the reversing switch bracket should be adjusted by means of its elongated mounting holes until the switch pin "I" just lightly touches trip lever "H."

Main Pinion Gear.-Clearance between the small high- speed pinion gear "E" and the intermediate gear "K" deter mines the amount of mechanical noise produced. Correct adjustment will give approximately 1/32 of an inch movement of back lash at the end of pinion arm "G" when gear "K" is held stationary. Arm "G" must also be adjusted for correct mesh with motor shaft drive pin "F." With the motor shaft completely forward and pinion "E" tight against its front bearing, the pinion mounting stud "J" should be adjusted so that pin "F" meshes its full thickness with the rotating arm "G." An increase of this mesh will increase over travel on tuning while a decrease of mesh will decrease the over travel. The elongated hole in the front bracket allows sufficient movement of the mounting stud "J" to per. mit above mentioned gear mesh adjustment.

"Manual -Electric -Remote" Changeover. - (1) Link and lever adjustment-To properly line up the mechanical link between the switch shaft and throw -out gear bracket "MM," the set screws holding the link lever on the switch shaft must be loosened, the switch turned to the "Remote" position (ex treme left) and the link lever revolved until the distance between the bottom of its link -connecting pin (extends through chassis apron) and the bottom of the "C" slot, in front apron of chassis, is exactly 1/4 of an inch. If this ad justment is not properly made, correct operation of "Electric" or "Remote" tuning will not result. (2) Throw -out Gear Adjustment-To obtain smooth operation on "Electric" or "Remote" positions it is important that the proper clearance is maintained between the throw -out gear "M" and the intermediate gear "L." With the "Manual -Electric -Remote" control thrown to "Remote" position (extreme left) adjust the mesh between these gears by means of the eccentric screw "0" and lock nut "P" on the throw -out gear bracket "MM" until there is approximately 1/64 of an inch backlash of gear "L" when gear "M" is held stationary.

Vernier Tuning.-In case it becomes necessary to remove tuning condenser drive shaft "T," it should be replaced by sliding anti -backlash gear "R" on condenser shaft apart so that compression amounting to one tooth on the gear is ob. tained in the springs. Adjust mesh of gear "R" with pinion gear "U" on vernier shaft before tightening screws "S" so that smooth tuning is obtained throughout the range.

Motor Alignment.-The motor shaft must be exactly aligned with the axis of the pinion gear with which it engages. This may be adjusted by loosening the mounting screws "V" of the motor and aligning shaft by sight. Correct alignment may be tested by slowly rotating motor and observ- ing the relation between the pin "F" of the motor shaft and the arm "G" on the pinion. The relation of the two should

. CO.. INC. Tuner Adjustments Part 2

remain the same throughout the revolution. Additional movement for adjustment may be obtained by the motor bracket screws "W" if necessary.

Station Selector Drum.-(1) Bearing Adjustment-The selector drum may be removed by unscrewing the two bear ing adjusting screws "X" on the front and rear bearings and sliding shaft out of slots on frame. To replace drum, the reverse procedure should be followed holding bearing adjusting plates "Y" firmly against the shaft and tightening adjusting screws. (2) Contact adjustment-Two types of contact strips are used. They are designated on figure 8, as types 1 and 2, on which the individual contacts are respectively adjustable and fixed. On type 1, the individual contacts should be ,adjusted by setting the end contact springs near the mid -position of their travel and aligning the remaining springs to them by means of a straight edge. Either type of contact strip should be adjusted to the selector drum by placing two selector adjusting keys in the station adjustment strip, positions 1 and 8, loosening contact strip adjusting nuts "Z" and shifting the contact strip until the end con tacts are exactly centered on the respective disc insulating segments. More accurate adjustment may be made by sil houetting the point of contact with a piece of white paper held behind the contact. Adjustment will be facilitated by removing complete assembly from rear of tuning condenser by unscrewing the three mounting screws. Contacts and discs must be kept free of dirt, filings, and other extraneous matter.

Lubrication. - The dial pointer slide should be greased with petrolatum. This same lubrication should be applied lightly to all gear faces of the drive mechanism and sparingly with a cloth to the station selector discs. Any good house hold oil, such as "3 -IN -ONE," is suitable for the motor shaft bearings. A light grade of engine oil should be used for all gear bearings. Medium viscosity engine oil, similar to

PYROIL" (B), should be applied between the thrust washers on the motor shaft. "CASTORDAG," a mixture of graphite and castor oil, is recommended for use at the selector drum end -bearing slots and at the bearings of cable pulleys. Station Adjustment

Any eight stations may be chosen for "Electric" tuning. Remove the two escutcheon plates from the side of the dial, place proper call letter labels in the celluloid windows, and replace escutcheons. Turn the power on and proceed to set up the "Electric" tuning as follows:

1. Set Range Selector to "Broadcast." 2. Turn "Manual -Electric -Remote" control to "Electric." 3. Turn Fidelity control counter -clockwise. 4. Press push button No. 1 and wait until station pointer

comes to rest. 5. Turn the "Manual Electric Remote" control to

"Manual." 6. Remove adjusting key from receptacle on top of station

selector drum mechanism. 7. Insert key in position marked, "1" in station adjust

ment strip and push the key all the way down to properly fit in slot in disc.

8. Tune the receiver very carefully by means of the manual tuning knob and the "Magic Eye," to station chosen for No. 1.

9. Remove key. 10. Turn the "Manual -Electric -Remote" control to "Elec.

tric." Button No. 1 is now properly set for "Electric" tuning.

Proceed similarly for the other seven push buttons, matching each station on the dial with the same number on the station adjustment strip. Repeat the above steps but place the key respectively in positions 2, 3, 4, etc., and in each case tune to the proper station. Now when you press a button the desired station will be tuned in electrically.

Note.-In the event that all the push-button switches are locked "ia" at once, they may be released by pressing either the upper left-hand or the lower right-hand push buttons (Nos. 1 or 8) in farther than would ordinarily be required. Armchair Control

When a Model G-8 armchair control is attached to the receiver as shown in figure 5 it duplicates the action of the push buttons on the front panel when the 'ManualElectric- Remote" control is turned to "Remote" position.

©John. F. Rider, Publisher


RCA PAGE 9-143

RCA MFG. CO.,

Calibrate the tuning dial by adjusting dial pointer to the left ends of horizontal calibration lines with the gang tuning, condenser plates in full -mesh position. This is a screw -driver adjustment.

The "Manual -Electric -Remote" switch should be turned to "Manual" (clockwise) during alignment unless otherwise specified.

CAUTION.-The magnetite core screw L22 on the bottom of the 4th i -f transformer has been accurately adjusted, for an exact electrical balance of coil L22 to center tap, during manufacture and should not be disturbed. However, if for any reason the adjustment has been moved from its original position, it will be necessary to mechanically adjust this screw until the end of the stud protrudes exactly A of an inch (four threads exposed) above the brass bushing prior to any alignment operations.

Perform alignment in proper order, tabulated below, starts ing with No. 1 and following all operations across, then N. 2, etc. A -f -c discriminator adjustments should_ follow, r -f and i -f adjustments tabulated below. Adjustment locations are shown on figures 4 and 6.

Cathode-ray alignment ispreferable; the connections to the chassis are shown on figure 2. If an output indicator is used, connect it across the loudspeaker voice -coil and advance the receiver volume control to full -volume position.

Connect the "love output terminal of the test oscillator to the receiver chassis for all alignment operations. Regulate the output of the test oscillator so that minimum signal is applied to the receiver to obtain an observable output indication. This will avoid a -v -c action.

The term "Dummy antenna" means the device which must be connected between the "high" test -oscillator output and the point of connection to the receiver in order to obtain ideal alignment. "No signal, 550.750 kc" means that the receiver should be tuned to a point between 550 and 750 kc where no signal or interference is received from a station or local (heterodyne) oscillator.


A -F -C Discriminator Adjustments.-These adjustments are rather critical and should, be performed with extreme care. Improper adjustment mai' result in complete failure of the oscillator control tube to function or else may cause it to detune the oscillator instead of tuning it to the signal. It is assumed that the magnetite core adjusting screw L23 (top of 4th i -f transformer) has been turned all the way out (ex,

INC. MODEL U109 Alignment

treme counter -clockwise) during the preceding tabulated adjustments. Adjustments are as follows: Remove spring "N" on link and arm assembly which connects the "Manual - 'Electric -Remote" switch shaft to the throw -out gear bracket. Turn "Fidelity" control counter -clockwise. Connect antenna

to receiver antenna "A" terminal. With the "Manual -Electric. Remote" switch in "Manual" (clockwise) position, tune in a strong local station near 600 kc or the low -frequency end of the "A" band as accurately as possible by means of the tuning tube "Magic Eye." The most accurate adjustment will

be obtained by adjusting the "vernier" tuning knob mid -way between the two points where the eye just appears to start to open. This will place the generated i -f carrier signal frequency exactly in the center of the i -f amplifier response curve (should be 460 kc if i -f amplifier was properly aligned) and is the frequency to which the a -f -c discriminator (4th i -f transformer) should be tuned to resonance. Without dis-

turbing any of the receiver adjustments, place the "high" test -oscillator lead about 3/4 of an inch from- the grid cap lead of the RCA -6K7, 1st i -f amplifier tube, adjust the test - oscillator output to maximum, turn test -oscillator "Modula- tion" off, and carefully zero -beat the test -oscillator frequency (approximately 460 kc) with the i -f carrier signal. Avoid placing the test -oscillator lead nearer to the grid cap lead

than specified above, as doing so will tend to detune the i -f amplifier. It may be necessary to reduce the local station signal, during this operation, by shortening antenna lead or grounding antenna "A" terminal to chassis in order to in, crease the loudness of the beat note sufficiently for accurate zero -beat adjustment.

Throw "Manual -Electric -Remote" switch to "Electric" (center) position. A high whistle or beat note will now be heard. Turn the magnetite core screw L23 (top of 4th if transformer) slowly clockwise. As this screw is turned, the beat note will first increase to a high audio frequency and will then decrease to a zero -beat and then increase in frequency again. The point of exact zero -beat is the position for correct adjustment of the discriminator. Zero -beat should also still exist when the "Manual -Electric -Remote" switch is thrown back to "Manual" position. The adjustment is now complete and may be checked by slightly detuning the receiver above and below the local station frequency with the "Manual -Electric -Remoti in "Manual" position, switching to "Electric" position, and noting the oscillator pull -in. Re place spring "N."

Order of Alignment

Test Oscillator Range- Selector


Circuit to Adjust

Adjustment Symbols



Frequency Setting

1 4th I -F Trans. L23

Turn Extreme Counter- clockwise

2 6K7 I -F

Grid Cap .001 Mfd. 460 kc "A" Left No Signal

550-750 kc 3rd I -F Trans. L20 and L21 Max. (peak)

3 6K7 I F

Grid Cap .001 Mfd. 460 kc No Signal


4 6L7 Det. Grid Cap .001 Mfd. 460 kc "A" No Signal

550-750 kc 1st I -F Trans. L15 and L16 Max. (peak)

5 Ant. 300 Ohms 20,000 kc "C" Right 20,000 kc "C" Osc. C43 Max. (peak)*

6 Ant. 300 Ohms 20,000 kc Rock thru 20,000 kc "C" Det. C8 Max. (peak)[

7 Ant. 300 Ohms 20,000 kc C 20,000 kc "C" Ant. C2 Max. (peak)$

8 Ant. 300 Ohms 6,000 kc "B" Center 6,000 kc "B" Osc. C45 Max. (peak)*

9 Ant. 200 Mmfd. 600 kc "A" Left 600 kc "A" Osc. L14 Max. (peak)

10 Ant. 200 Mmfd. 1,500 kc "A" 1,500 kc "A" Osc. C51 Max. (peak)

11 Ant. 200 Mmfd. 600 kc "A" 600 kc "A" Osc. L14 Max. (peak)

12 Ant. 200 Mmfd. 1,500 kc "A 1,500 kc "A" Osc. C51 Max. (peak)

13 Proceed to A -F -C Discriminator Adjustments Outlined Below

* Use minimum capacity peak if two peaks can be obtained. f Use maximum capacity peak if two peaks can be obtained. $ After this adjustment, check for image signal by shifting receiver dial to 19,080 kc.



144 RCA

Figure 10- m

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RCA PAGE 9-145 MODEL U109 RCA MFG. CO., INC. Automatic Record Changer Views

3N-765 C PH -45645

Figure 9-Automatic Record Changer Adjustments (Top and bottom views)

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PAWL TRIP FINGER

TRIP PAWL STOP PIN



VAGE 9-146 RCA

LUDEL U109 Automatic Record Changer

RCA MFG. CO., INC.

The record changing mechanism is designed to be simple and fool -proof. Under normal operating conditions, service difficulties should be negligible. Occasionally, however, certain adjustments may be required. It is important to refrain from forcing the mechanism if there is a tendency to bind or jam, since bent levers and possibly broken parts may result.

Record Changer Adjustments Mount motor -board on a level support. Remove turntable

and cover at right of turntable. Adjustment locations are designated on figure 9 as A, B, etc. The adjustments are explained under corresponding symbols below Perform adjustments in the following order:

A.-Trip rod "A" should be engaged in "Switch Lever" slot. Adjust trip rod "A" to obtain about % of an inch clearance from motor -board.

B.-Adjust "B" to the position shown. C.-With "Index Lever" in "Manual" position, "Pickup

Arm" rotated to extreme left, and switch tripped to open contacts "C," adjust contact points "C:' by bending the stiff contact arm until points are opened 10 to 30 thousandths of an inch.

D.-With "Index Lever" in "Manual" position, release set screw "D" and force "Manual Index Finger" as far as it will go towards "Trip Pawl Stop Pin." Tighten set screw.

E.-Adjust at "E" to provide approximately 1/32 of an inch between outer end of "Link Slot" and screw when rubber "Bumper" is in contact with stop bracket.

F. and G.-Remove rubber silencer at "F" and adjust "F" and "G" so ejector tip "F" is in line with "Spindle." Longitudinal movement, with respect to "Ejector Arm," may be effected by loosening hex. head at "F." Lateral movement of "Ejector Arm" may be effected by adjustment "G."

H.-Adjust "H" so under side of pickup head can be raised 2% inches above motor -board.

J.-Adjust screw "J" until friction will just force "Trip Finger' to move "Trip Pawl" when "Index Lever" is in "12" inch position.

N.-Adjust needle pressure by turning screw under center of "Pickup Arm" so that a force of 72 grams (2.5 ounces) is required to lift needle from record. Hook scale under needle screw to measure force.

K.-Adjustment "N" must be performed prior to this adjustment. With a 12 -inch record on turntable, turn on "Motor Switch," place "Index Lever" to "12" position and adjust "K" so that "Cable" tension will allow needle to lower slowly on start of record at completion of eject cycle. Turn "Motor Switch" off after eject cycle is completed and check to sec that "Cable" is slightly loose when "Pickup Arm" is moved against "Spindle." Replace turntable and put a needle in "Pickup."

L.-Adjust "L" so needle will drop into center of smooth portion at the start of a 12 -inch record when "Index Lever" is in "12" inch position and "Pickup Arm" is to extreme right.

M.-Loosen three screws "M" and rotate "Spacer" until pointer on "Spacer" is in line with screw to right of "Pick- up Arm."

P.-Adjust turntable height by insertion or removal of thrust washers at "P" so ejector tip "F" will not eject bot tom 12 -inch record but will eject second from bottom record.

Q.-Adjust position of shorting switch at "Q" so switch closes when needle is just outside a 12 -inch record.

R.-Adjust screw "R" upward just enough so that with one record on turntable and ejector tip "F" resting on record surface, there is 1/32 of an inch clearance between screw "R and "Ejector Aim."

Record Changer Service Hints 1.-"Ejector Arm" goes through normal cycle but does not

eject records. Adjust "F" and "G." See that "Spindle" slides freely.

Adjustments ,Hints Pick-up Data

2.-Ejects bottom record. Lower turntable by_ removing thrust washers at "P."

3.-Ejects records properly down to second from bottom of pile. Raise turntable by placing thrust washers at "P."

4.-Eject cycle does not start after needle reaches eccentric groove. Adjust "J" (turn screw clockwise).

5.-Eject cycle starts before eccentric record groove is reached. Adjust "J" (turn screw counter -clockwise). Set "Index Lever" to "12" inch or "10" inch position after starting to play record. Do not jar motor -board during automatic operation.

6.-Lateral movement of "Pickup Arm" has no control over starting and stopping. Adjust clearance of rod "A." See that rod "A" engages in slot of "Switch Lever."

7.-Fails to eject top record of a pile because "Ejector Arm" strikes record in returning to center at end of eject cycle. Adjust screw "R" upward to. provide greater incline so that roller in "Ejector Arm" will roll back during cycle.

8.-Pickup strikes record during eject cycle. Adjust "K" and "H."

9.-Starts playing record several grooves in from begin- ning or needle misses record entirely. Adjust "L.-

10.-Needle falls on smooth portion at start of record but does not move into playing groove. Adjust "M." Check to see that motor -board is level.

11.-Automatic stop does not operate after needle reaches eccentric groove. Adjust "B" and "C."

12.-Motor does not re -start when "Pickup" is returned to rest position. Adjust "C." See that switch mechanism parts move freely and springs are functioning.

13.-Starts eject cycle although set for "Manual" operation. Adjust "D."

14.-Noise in loudspeaker while changing needles. Clean "Shorting Contact" and adjust "Q."

15.-"Wow" in record reproduction.-Instrument should be warmed to about 65° F. Ejector tip should be centered and free to rotate (adjustments "F" and "G"). There should be no solid particles on gear teeth or in grease; no tendency to bind. Turntable plate should be in dynamic balance and "Spindle" should be straight. Proper lubrication is important.

Lubrication.-Clean motor gear -box thoroughly before re - greasing. Apply less than a tablespoonful of a grease, such as "Cities Service No. 7035 -Al" or "Koolmotor Universal Trojan No. 1," directly on gears taking care to get none in rotor bearings. Put medium motor oil (S.A.E. No. 30) in the oil holes. Cover main gear and cam of automatic mechanism with a light grease such as "Socony-Vacuum No. 2." Any good house -hold oil, such as "3 -IN -ONE" is suitable for the ejector -tip "F" bearing.

Pickup An adjustment is provided to compensate for reduced

sensitivity of the crystal pickup with age. Adjustment requires the use of a 1,000 -ohm -per -volt a -c voltmeter (rectifier type, 10 -volt range) and a frequency record. With the voltmeter connected across the loudspeaker voice coil, "Phonograph Volume" and "Fidelity" controls turned ex, treme clockwise, "Dynamic Amplifier" control turned counterclockwise, and "Exp.-Off Switch Cable" -plug pulled out from apron of dynamic amplifier (see figure 10), adjust R101 (end of compensator unit) until an RCA Victor Technical Purpose Record Cat. No. 84519-A or 84505-B gives a voltmeter reading of 5 volts on 400 cycles. Adjustment of R101 will be facilitated by removing the compensator unit from the phonograph control panel, after removing control knobs and shaft bushing nuts. R101 should also be adjusted if pickup is replaced.



RCA PAGE 9-147

ItCr1 MFG. CO,, INC. IIflODEL U109 - Parts List

Insist on genuine factory tested parts, which ere readily identified and may be purchased horn authorized dealers.

STOCK No. DESCRIPTION O

K STOCK DESCRIPTION

RECEIVER ASSEMBLIES 11300 Resistor -33,000 ohms, carbon type, 1/10 watt (R42) 13735 Resistor -33,000 ohms, carbon type, } watt (R5)

14701 Arm -Hub and arm for operating band indicator shutter 5145 Resistor -100,000 ohms, carbon type, } watt (R7) -located on range switch shaft 30552 Resistor -120,000 ohms, special, carbon type, ! watt

14728 Arm -Hub and arm, complete with set screws --connects (R41) station selector drum to rear of tuning condenser shaft 5158 Resistor -220,000 ohms; carbon type, 4 watt (R45)

14517 Board -Antenna and ground terminal board 11323 Resistor -270,000 ohms, carbon type, 4 watt R46 5237 Bushing -Variable condenser rubber mounting bushing 11172 Resistor -470,000 ohms, carbon type, } watt (R17, R20)

13658 Button -Plug button for detector coil shield 11397 Reaiator-560,000 ohms, carbon type, 1/10 watt (R1, 14725 Cable -Tuning tube cable and socket R3) 12607 Cap -Shield cap for first or second I.F. transformer 12013 Resistor -1 megohm, carbon type, 1/30 watt (R36) 12581 Cap -Shield cap for third or fourth I.F. transformer 13730 Resistor -1 megohm, carbon type, } watt (R44) 11350 Cap -Grid contact cap 11826 Resistor -2.2 megohms, carbon type, } watt (R18, R21) 12884 Capacitor -Adjustable trimmer (long) (C2, C46, C51) 13732 Resistor -10 megohms, carbon type, } watt (R35) 12714 Capacitor -Adjustable trimmer (medium) (C8, C43) 14845 Resistor -Voltage divider -comprising two 1,000 ohm, 13200 Capacitor -10 Mmfd. (C52) one 3,400 ohm and one 4,000 ohm sections (R60, R51, 12723 Capacitor -56 Mmfd. (C30) R52, R53) 12813 Capacitor -82 Mmfd. (C6) 14695 Rod -Tie rod for joining lockplate pawls on station so- 12720 Capacitor -100 Mmfd. (C28, C60) lector push-button switches 12404 Capacitor -120 Mmfd. (C24) 4669 Screw -No. 8-32 x 5/32 square head set screw for arm, 12724 Capacitor -120 Mmfd. (C54) Stock No. 14701, or link, Stock No. 14719, or drum, 14712 Capacitor -180 Mmfd. (C21, C23) Stock No. 14893 14711 Capacitor --220 Mmfd. (C17. C18) 12418 Screw -No. 8-32 x 3/16 milled head set. screw for gear, 12952 Capacitor -330 Mmfd. (C3, C59) Stock No. 14739 14710 Capacitor -430 Mmfd. (C11, C15) 14848 Selector -Station selector drum mechanism -comprising 13052 Capacitor -470 Mmfd. (C48) station -selector contactor discs, spring contacts and 14724 Capacitor -580 Mmfd. (C4) motor reversing switch assembled in metal frame 14723 Capacitor -890 Mmfd. (C47) 14374 Shield -Antenna or detector coil shield 13762 Capacitor -1,500 Mmfd. (C69) 14375 Shield -Oscillator coil shield 12729 Capacitor -1,550 Mmfd. (C48) 12008 Shield-I.F. transformer shield 12897 Capacitor -4,700 Mmfd. (C5, C49) 14718 Shutter -Band indicating shutter and arm assembly 14722 Capacitor -6,100 Mmfd. (C44) 14696 Slider -Indicator pointer holder and spring 13608 Capacitor -.0025 Mfd. (C65) 11488 Socket -2 -contact female socket for compartment lamp

4838 Capacitor -.005 Mfd. (C84) power cable 30103 Capacitor Pack -Comprising one .005 Mfd., one .015

Mfd. capacitors, one 27,000 ohm and one 56,000 ohm 11198 Socket -B -contact 61C7, 6L7, 6.17, 8H6 or 6C5 Radio-

tron socket resistors (C31, C32, R2S, R24) 14114 Socket -Dial or indicating lamp socket

13138 Capacitor -.01 Mfd. (C12, C13. C22) 12007 Spring -Retaining spring for core. Stock No. 12006 4870 Capacitor -.025 Mfd. (C28) 3878 Spring -Tension spring for link and lever, Stock No. 4886 Capacitor -.05 Mfd. (C20, C56) 14719 4839 Capacitor -0.1 Mfd. (C9. C10. C14) 13638 Spring -Tension spring for cord, Stock No. 14899

12484 Capacitor -0.25 Mfd. (C18, C19, C55) 14694 Spring -Tension spring for lockplate pawl on station se - 12741 Capacitor -0.5 MEd. (C27, two in parallel) lector push-btittorr. switches 12682 Capacitor -10 Mid. (C66) 14742 Stud -Mounting stud for gear and arm, Stock No. 14738 14773 Capacitor -16 Mfd. (C50. C68) 14792 Switch -"Manual -Electric -Remote" switch (S7, S12, 515) 14372 Coil -Antenna coil and shield (L1, L2, LS, L4) 14844 Switch -"Phono -Music -Speech" switch (She) 14414 Coil -Detector coil and shield (L6, L8, L7, LB, L9,

L10) 14732 Switch -Motor reversing switch and mounting plate for

station selector (S9) 14713 Coil -Oscillator coil and 'shield (L11, L12, L13, L14) 14704 Switch -Range switch (S2, SS, S4, SB)

14727 Condenser -3 -gang variable tuning condenser, complete with gear train (C1, C7, C53)

14728 Switch -A -F -C and A -F amplification suppression switch (S14)

14733 Contact -Spring contact for engaging discs in station selector drum ("type 1" cóntact assembly)

14693 Switch -Station selector button switch -comprising four contacts and corresponding lockplates, completely as -

10385 Contact -Comprising eight spring contacts assembled on sembled on insulating strips insulating strip for engaging discs in station selector 14836 Tone Control -"Fidelity" control (R214, S5) drum ("type 2" contact assembly) 14708 Transformer -First I.F. transformer (L16, L16, L17,

14899 Cord -Indicator pointer drive cord C11, C15) 12008 Core -Adjustable core and stud for I.F. transformers 14707 Transformer -Second I.F. transformer (L18, L19, L29, 12800 Cote -Adjustable core and stud assembly for oscillator C17, C18)

coil 14708 Transformer -Third I.F. transformer (L20, L21, C21, 14717 Dial -Station selector dial scale C23) 14740 Drive -Tuning condenser vernier drive shaft and pinion

gear 14709 Transformer -Fourth I.F. transformer (L22, L23, L24,

C24) 14698 Drum -Drum for indicator drive cord -fastens on tuning

condenser shaft 14834 Transformer -Tuning motor transformer, 105-125 volts,

50-60 cycle (T4) 14731 Drum -Station selector drum rotor -comprising eight

station -selector contactor discs assembled on shaft 30102 Transformer -Tuning motor transformer, 105-125 volts,

25-60 cycle (T4) 13812 Filter Pack -Comprising two 0.43 Henry chokes, two 14835 Volume Control -Radio volume control and power switch

580 Mmfd., one 2,200 Mmfd. and one 1.000 Mmfd. capacitors (L30, L31, C61. C62, C63, C87)

(R22,- S201)

14738 Gear -Drive pinion gear and arm AMPLIFIER ASSEMBLIES 14739 Gear -Drive gear and set screws -located on tuning con-

denser knob shaft 14272 Bracket -Expander control mounting bracket 14734 Gear -Intermediate gear assembly -comprising one .749" 12511 Cap -Grid contact cap

O.D.-34 tooth -gear and one .291" O.D.-12 tooth 12110 Cap -Top shield cap for 8L7 Radiotron pinion assembled 12720 Capacitor -100 Mmfd. (C210, C211)

14735 Gear -Intermediate gear assembly -comprising one 1.541" 14831 Capacitor -820 Mmfd. (C222) O.D.-72 tooth -gear and one .291" O.D.-12 tooth 5107 Capacitor -.0025 Mfd. (C209) pinion assembled 5005 Capacitor -.0035 Mfd. (C212)

14738 Gear -Intermediate gear assembly -comprising one 1.541" 4838 Capacitor -.006 Mfd. (C21S, C214) O.D.-72 tooth -gear and one hub assembled 13138 Capacitor -.01 Mfd. (C215)

14737 Gear -Throw -out gear and bracket 4888 Capacitor -.O6 Mfd. (C205) 14716 Holder -Dial scale holder and reflector, complete with 4518 Capacitor -.05 Mfd. (C201)

holding springs for band indicating shutter 4839 Capacitor -0:l Mfd. (C218, two in parallel) 14715 Indicator -Station selector indicator pointer and support 12484 Capacitor -0.25 Mfd. (C208, C217) 5228 Lamp -Dial or indicating lamp 12741 Capacitor -0.5 Mfd. (C202)

14719 Link -Link and lever assembly 11203 Capacitor -10 Mfd. (C220) 14730 Motor -Tuning drive motor for 25 cycle models only 5212 Capacitor -18 Mfd. (C204, C208)

(M1) 11496 Capacitor -18 Mfd. (C219) 14729 Motor -Tuning drive motor for 80 cycle models only

(M1) 14273 Capacitor -Pack comprising one 20 mfd. and one 10

mfd. sections (C203. C207) 14028 Nut -Jamb nut for trimmers, Stock Nos. 12714 and 14531 Capacitor -25 Mfd. (C221)

12884 11320 Coil -Choke coil (L204) 12471 Plate -Mounting plate for cushion socket -less' socket 5240 Cover -Fuse mounting cover 14741 Plate -Tuning condenser front plate and studs assembled 12488 Expander Control (R204)

for mounting drive gears 10907 Fuse -3 amp. (F201) 14897 Pulley -Indicator pointer cable pulley 5239 Mounting -Fuse mounting -110 volt 13988 Resistor -10 ohms, carbon type, I watt (R40) 12471 Plate -8L7 socket mounting plate assembly -less socket, 11932 Resistor -330 ohms, carbon type, 1/10 watt (R4) Stock No. 11198 13250 Resistor -S30 ohms, carbon type, I watt (R14) 12486 Reactor -Filter reactor (L201)

5030 Resistor -470 ohms, carbon type, i watt (R391 14795 Resistor -0.27 ohms, resisto -fuse, 1.2 ampere (R22S) Resistor insulated, } watt (R222) 14837 Resistor -1,000 ohms, carbon type, 1/10 watt (RB, R15, 14281 -88 ohms, Resistor -270 ohms, insulated, } watt (R202) R43) 13454

14720 Resistor -1.000 ohms, carbon type, } watt (R2. R8) 12194 Resistor -1,800 ohms, insulated, } watt (R212) 13737 Resistor -3.300 ohms, carbon type, I watt (F.47) 11298 Resistor -5,800 ohms, carbon type, 1 watt (R210) 11647 Resistor -5.800 ohms, carbon type, i watt (R48) 11728 Resistor -6,800 ohms, carbon type, } watt (R224) 5114 Resistor -15.000 ohms, carbon type. 1 watt (Rt4) 11332 Resistor -22,000 ohms, carbon type, 1 watt (R209)

14078 Resistor -18.060 ohms, carbon type, 1 watt (R34) 12487 Resistor -33,000 ohms, carbon type, 2 watt (R205) 14721 Resistor -22,000 ohms, carbon type, I watt (R13, R49) 12875 Resistor -56,000 ohms, carbon type, 1 watt (R213)



148 RCA MODEL U109 Parts List RCA MFG. CO., INC.

STNo It DESCRIPTION STNOCK o. DESCRIPTION

5029 Resistor -56,000 ohms, carbon type, I. watt (R220) MOTOR ASSEMBLIES 5145 Resistor -100,000 ohms, carbon type, } watt (R219) 9735 Motor -105-125 volts -25 cycles (M1D1) 11323 Resistor -270,000 ohms, carbon type, } watt (R206) 9651 Motor -105-125 volts -50 cycles (M101) 5035 Resistor -560,000 ohms, carbon type, } watt (R211) 9650 Motor -105-125 volts -60 cycles (M101) 12486 Resistor -580,000 ohms, insulated, * watt (R207, R208,

R215) 12050 Suspension Spring-Motor P P B-Motor mounting spring, washer and

12200 R megohm, insulated, }watt (R201)stud assembly-comprising six springs, six cup washers, three spring washers and three studs

14752 Resistor -2.7 megohms, insulated, I watt (R203) 14275 Socket -2 -contact female socket for phonograph motor MOTOR BOARD ASSEMBLIES 14276

power supply Socket -2 -contact female socket for "expander-off"Base- switch 11881 BPh onora B ph compartment lamp socket and base

14280 Socket -2 -contact n -contact female socket and clinching plate for radio input

14819 Cable-Shielded pickup cable-connects shorting switch to compensator pack

14277 Socket -3 -contact female socket for power switch or tuning motor power supply

12051 Capacitor -2 Mfd., complete with 2 -contact male connector for use with motor, Stock Nos. 9650 or 9851

4794 Socket -4 -contact 2A3 or 5Z3 Radiotron socket only (0104) 14279 Socket -5 -contact female socket for chassis power supply 13101 Capacitor -4 Mfd., complete with 2 -contact male con - 11197 Socket -6 -contact 6C5 Radiotron socket nector for use with motor Stock No. 9735 only (C104) 11198 Socket -7 -contact 6H6 Radiotron socket 4674 Connector -2 -contact male connector for Stock Nos. 11196 Socket -8 -contact 6L7 or 6F5 Radiotron socket 12051, 13101 or phono compartment lamp leads 14274 Socket-Single contact female socket and plate for phono - 4577 Connector -2 -contact male connector for motor cable

graph or expender input 11488 Connector -2 -contact female connector for motor leads 14278 Socket-Single contact socket and plate for tone control 14760 Cup-Used-needle cup 13964 Transformer-Interstage driver transformer (T202) 14762 Damper-Turntable damper 14271 Transformer-Power transformer, 105-125 volts, 50-60

cycle (T201) 11553 Escutcheon-Index escutcheon engraved "Manual -12-

10" 14846 Transformer-Power transformer, 105-125 volts, 25-60 14688 Knob-Needle rest knob

cycle (T201) 4340 Lamp-Phonograph compartment lamp -6.3 volts 30130 Transformer-Power transformer, 100-130/140-160/195- 3764 Nut-Cap nut for motor board suspension

250 volts, 50-60 cycle (T201) 14761 Rest-Pickup rest

EJECT ARM ASSEMBLIES 14825 Roller - Pickup arm cable guide roller - comprising

bracket, roller and guide pin 14753 Arm-Effect arm, complete

11711 Shade-Phonograph compartment lamp shade 14753 Ball -1/16 -inch diameter steel ball

14758 Spacer-Pickup arm mounting spacer 10129 Ball -1/16 -inch diameter steel ball

14270 4565

Spring-Retaining spring for knob, Stock No. 14758 Spring-Tension spring for needle rest 11529 Bearing-Effector tip bearing and nut 3763 Suspension Spring-Suspension spring, washer and bolt 11538 Bracket-Eject arm bracket assembly for motor board-comprising one bolt, two 11537 Collar-Eject arm shaft collar and set screw cup washers, two springs, two "C" washers, and one 11536 Cushion-Counter balance roller cushion-located inside cap nut of eject arm 30157 Switch-Pickup shorting switch (S105) 4055 Post-Vertical adjustment post-located on eject arm 4671 Switch-Operating switch-toggle switch (S104)

3729 bracket

Roller-Eject arm counter balance roller-located inside of elect arm

14759 Turntable. complete

REPRODUCER ASSEMBLIES 4580 Screw-No. 6 -32 -3/16 -inch square head set screw for eject arm collar Speaker RL78-4

11534 Screw-No. 8 -36 -7/32 -inch special screw for eject arm 14606 Cap-Dust cap for cone center tip center adjustment 14785 Coil-Field coil (L202)

11535 Shaft and Collar-Eject arm vertical action shaft and col- 14602 Cone-Reproducer cone and dust cap (L203) lar assembly 14847 Diffuser-Reproducer diffuser

11528 Silencer-Ejector tip silencer 14786 Plug -6 -contact male plug for reproducer 4067 Spring-Ejector arm bracket spring 14784 Reproducer, complete

11531 Spring-Ejector tip spring 14358 Screw-Screw, washer and lockwasher to hold core in 11530 Tip-Ejector tip with tip center, adjusting screw and cap yoke 11539 Yoke-Eject arm yoke assembly 12568 Transformer-Output transformer (T203)

14357 Washer-Spring washer to hold field coil PICKUP AND ARM ASSEMBLIES

10941 Ball-Steel ball for pivot shaft bearing MISCELLANEOUS ASSEMBLIES 3204 Cable-Pickup lift cable 12038 Band-Rubber band for tuning tube

30101 Cable-Shielded pickup cable-connects pickup unit to 14744 Bracket-Tuning tube mounting bracket and clamp shorting switch 14745 Button-Station selector push-button

Cable-Shielded 12850 Damper-Pickup arm pivot shaft damper-comprising one upper rubber damper and bearing, one lower rubber

14789 phonograph volume control cable, complete with male plug-compensation unit to amplifier

damper and one lower bearing 14790 Cable-Shielded expander control cable, complete with 14820 Mechanism-Pickup mechanism, complete with needle two male plugs-compensation unit to amplifier

screw 12723 Capacitor -56 Mmfd. (C105) 14818 Pickup and arm, complete 12951 Capacitor -2,200 Mmfd. (C107) 12546 Plug-Pivot shaft bearing plug 14393 Capacitor-.01 Mfd. (C101) 14823 Rod-Pickup arm brake trip rod 11315 Capacitor-.015 Mfd. (C102, C103) 14822 Screw-Needle screw 14747 Card-Call letter cards for station selector 14824 Screw-Pickup mechanism terminal 14840 Escutcheon-Station selector and tuning tube escutcheon, 14913 Spring-Pickup arm tension spring complete with crystal, indicating cards and buttons - 14821 Support-Pickup mechanism support less station indicating cards

OPERATING MECHANISM 30570 Escutcheon-Right- and left -land side panels for electric

tuning buttons-less buttons, call letter cards, retainers, 14754 Cam-Cam and gear assembly and metal front plates-for use with station selector

6808 Clutch-Trip lever friction clutch dial escutcheon 14756 Cover-Metal cover for trip lever and friction finger

assembly 30569 Escutcheon-Station selector, dial and tuning tube es -

cutcheon and crystal, complete with "Radio -Phono" and 6809 Finger-Manual index lever finger assembly "Electric -Manual" indicating screens-less right- and 3670 Finger-Friction finger assembly left-hand side panels for electric tuning buttons

11554 Lever-Manual index lever-less pin 14787 Expander Control and Switch (R103, 5101, S102) 14755 Lever-Main lever and link assembly 14749 Indicator-"Electric-Manual" indicator screen 14914 Lever-Pickup lift cable lever 14841 Indicator-"Radio-Phonti' indicator screen 11555 Lever-Trip lever and friction clutch assembly 14751 Key-Key for use in setting "Electric Tuning" mechanism 6503 Pawl-Trip pawl assembly 14269 Knob-Phono-Music-Speech, Volume-Power, Tuning 3672 Pin-Manual index lever pin (small), Manual -Electric -Remote, Fidelity, Phonograph

13635 Plate-Eject arm actuating plate assembly Volume, and Dynamic Amplifier Control Knobs 4564 Screw-Manual index lever finger set screw 14688 Knob-Range selector knob 4059 Screw-Trip lever clutch tension adjustment screw 14359 Knob-Tuning knob (large) 4586 Screw-Special screw used to fasten main lever and link 14788 Pickup Control (R101)

assembly bushing 11607 Receptacle-Needle card holder 13637 Spacer-Pickup arm mounting spacer 12738 Resistor -27,000 ohms, insulated, I watt (R107) 13638 Spring-Actuating spring 12454 Resistor -33.000 ohms, insulated, I watt (R106) 4565 Spring-Manual index lever finger tension spring 14023 Resistor -82,000 ohms, insulated, } watt (R102) 4081 Spring-Main spring lever tension spring or pickup lift 12264 Resistor -220,000 ohms, insulated, } watt (R105)

cable spring 12201 Resistor -1.5 megohms, insulated, I watt (R104) 2893 Spring-Trip lever latch plate tension 11829 Roller-Record pocket slide roller-comprising one rub - 3676 Spring-Cam and gear pawl tension spring ber roller, one metal roller and two washers

14916 Spring-Pickup lift lever spring 11377 Screw-Amplifier mounting screw and washer 4125 Spring-Eiect arm horizontal action tension spring 5210 Screw-Chassis mounting screw and washer

13836 Stud-Pickup arm lift cable stud and nut 14746 Shield-Celluloid shield for station call letter cards 2917 Washer-Spring washer-"U" type 14274 Socket-Pickup cable socket and plate on compensation

unit AUTOMATIC SWITCH ASSEMBLIES 14270 Spring-Retaining spring for knobs, Stock Nos. 14688

3994 Cover-Motor switch cover and 14269 10184 Plate-Automatic brake latch plate 4982 Spring-Retaining spring for knob, Stock No. 14359 10174 Springs-Automatic brake springs 3763 Suspension Spring-Motor board suspension bolt, springs, 8805 Switch Assembly-Automatic switch, complete cup washers and cap nut 3522 Switch-Motor switch (S103) 14833 Volume Control-Phonograph volume control (R108)



RCA PAGE 9-149150

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Crystal Filter Control

RCA MFG.

Test Oscillator

CO..

Receiver Dial

Setting

INC.

Circuit to

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Adjustment Symbole

Mist Zo

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a

3

4

5

6

7

8

9

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11

12

13

14

15

16

17

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23

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27

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30

31

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"OFF"

617 Det. Grid Cap

6L7 Det. Grid Cap

61.7 Det. Grid Cap

617 Det. Grid Cap

617 Det.

Grid Cap

61n Det. Grid Cap

617 Det. Grid Cap

61.7 Det. Grid Cap

6117 and r -f Gril Cap

6K7 and r -f Grid Cap

"Ai" Ant Post

"Al" Amt. Post

6117 and r -f Grid Cap

6117 and r -f Cap

"Ai" Ant. Post

"Ai" Ant. Post



"Ai" Ant. Post

"Ai" Ant. Post



"Ai" Ant. Post

"Ai" Ant. Post



6117 and ref Grid Cap




"Ai" Amt. Post

"Ain

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.001 mfd.

.001 mfd.

.coi mfd.

.001 mfd.

.001 mfd.

.001 mfd.

.001 .fd.

300 ohm

300 ohm

300 ohm

300 ohm

300 ohm

300 ohm

300 ohm

300 ohm

300 ohm

300 ohm

300 ohm

300 ohm

30o ohs

300 ohm

300 ohm

300 ohm

300 ohm

30o ohm

300 ohm

300 ohm

300 ohm

30o ohm

300 ohm

300 ohm

460 kc

460 kc

460 kc

Shift Slightly for Max. Output

Final Setting of Above

"

"

"

a8,000 kc

28,000 kc

a8,000 kc

28,000 kc

14,000 kc

14,000 kc

14,0oo kc

14,000 kc

7,000 kc

7,000 kc

7,000 kc

7,000 kc

4,000 kc

4,000 kc

4,000 kc

4,000 kc

600 kc

1,500 kc

1,500 kc

600 kc

i,5oo kc

i,5oo kc

i,5oo kc

1.500 kc

No signal 550-750 kc

No signal

550-1 o kc

No signal

550-750 he

No signal 550-75o kc

No signal

550-750 kc

No signal

550-75o kc

No signal

550-75o kc

No signal

550-750 kc

a8,000 kc

Rock Thru 28,000 kc

Rock Thru 28,000 kc

Rock Theo 28,000 kc

14,000 kc

Rock Thru i4,000 kc

Rock Thrn 14,000 kc

Rock Thro i4,000 kc

7,000 kc

Rock Thru 7,000 kc

Rock Then 7,000 kc

Rock Thru 7,000 kc

4,00o kc

Rock Thru 4,00o kc

Rock Thru kc

Rock Thin 4,0o0 kc

600 kc

i,5oo kc

1,500 kc

Rock Thru boo kc

i,5oo kc

1,500 kc

1,500 kc

1,500 kc

3rd i -f Trans.

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let i -f Trans.

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"E" R -F

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"D" Osc.

"D" Det.

"D" R -F

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"C" Oec.

"C" Det.

"C" R -F

"C" Ant.

"B" Osc.

"B" Det.

'rB" R -F

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"A" 1,-F Omo.

"A" 8-F Osc.

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"A" LAP Osc.

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1.43 á Loa

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139 & 138

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143 A 14a

141 A Loo

139 A L38

- C27

Cas

C16

C6

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Cis

CS

C29

Ca3

C14

C4

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Can

C13

C3

137

C31

Cal

107

C31

Cal

C1a

Ca

Max. (peak)

Mix.(peak)

Max. (peak)

Max.(peak)

Max.(peak)

Max.(peak)

Max.(peak)

Check for Max.Oltput

Max.(peak)}

Max.(peak)

Max.(peak)'

Max.(peak)'

Max.(peak)'

Max. (peak)+

Max. (peak)+

Mai.(peak)+

Max.(peak)

Max.(peak)+

Max.(peak)+

Max.(peak)+

Max.(peak)*

Max.(peak)+

Max. (peak)+

Nax.(peak)+

.(peak)

Max.(peak)

Max.(peak)

Max.(peak)

Max.(peak)

Max.(peak)

Max.(peak)

Max.(peak)

- - - -

-

- - -

1 1 O O

28,9ao kc 14 P4

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156 RCA MODEL ACR 111 MODEL ACR 175 Selectivity Control Curves

RCA MFG. CO.. INC.

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RCA PAGE 9-157

RCA MFG. CO., INC.

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RCA

MODEL ACR 111 Notes,Operation

1. General

RCA MFG. CO., INC.

This new, sixteen -tube, RCA Amateur Communications Receiver is built for rack

and for table mounting and covers a frequency range of from 5µo to 30,000 kc.

It embodies the most up-to-date circuits and construction, including RCA metal

tubes, electrical band spread, beat -frequency oscillator, crystal filter,

noise suppressor, noise limiter, sensitivity and automatic -volume controls,

standby switch, loudspeaker, and phone jack. The advanced degree of sensi-

tivity and selectivity of the instrument together with its frequency stability

and reliability open to the operator a field of reception covering all com-

munications in the more important ranges.

This book should be studied carefully to learn how to make full use of the

ACR-Au and keep it in its optimum operating condition.

2. Special Features

An inspection of the schematic circuit diagram and the wiring diagrams make

clear the many developments incorporated in this model. See Fig.µ. 5 and u.

Metal tubes provide effective shielding as well as minimum terminal spacing

and short connecting circuits with their attendant advantages. The eleven

labeled controls, including the phone jack, are all on the front panel, thus

giving complete front panel operation. The two large diameter tuning knobs

with crank handles are comfortable and convenient -to the hand and facilitate

rapidity and ease of tuning. In conjunction with the vernier drive and elec-

trical band spread system, fine tuning adjustments are easily made. An AVC

Switch allows one to dispense with the use of the Automatic -Volume -Control

when desired.

The Crystal Filter in the first i -f stage provides single -signal reception

with an unusually high degree of selectivity, and the adjustable Selectivity

Control is a means of obtaining various degrees of selectivity with or without a rejection dip. The Electron -Ray -Tube Indicator fulfills the dual function

of measuring signal input and aiding in precise tuning.

The Noise Suppressor is a valuable aid in reducing interfering noises and thus

enabling the operator to obtain reception of maximum strength and fidelity and

minimum interference. It is used in conjunction with the Signal Input Control

A Noise Limiter is incorporated in the circuit by means of the second diode of

the second detector (RCA 61161 tube. This device reduces peak noises due to

excessive signals or bursts of static which load the anode beyond a certain

bias value.

The Selector Dial brings each scale separately into the dial opening by a turn

of the Range Selector knob and gives clear vision tuning calibrations for the

range in use only. In addition the vernier scale beneath provides for cali-

bration spread, and the readings of both tuning and calibration spread scales

may be entered in the station log for future reference when it is again de-

sired to receive the same station.

The Beat Oscillator is equipped with two controls, It) an "Oo-0f1" switch and

(a1 a Heterodyne Control with magnetite -core tuning which effectively governs

the pitch. The shield enclosing the entire beat -oscillator circuit enables

the listener to operate the set with freedom from undesirable beat notes due

to harmonics.

The Loudspeaker is a separate unit attached to the chassis by means of a

cable with a seven -prong plug-in connection. It is assembled on a small

wooden mounting in which holes are provided for fastening to a large baffle

when high -quality reproduction is required.

4. Circuit Data and Power Rating

Circuit - Superheterodyne with beat -frequency oscillator for CM reception,

noise suppressor, noise limiter, crystal filter, automatic volume control,

electron -ray tuning indicator, calibrated signal input (sensitivity; control,

electrical band spread, and class A pentode output system.

Power Output - 5 watts (undistorted); 8 watts maximum.

Loudspeaker - (separate unit) - Electro -dynamic 8 -inch (voice -coil impedance

x -i/µ ohms at µo0 cycles].

Tubes -

RCA -6K7 - Radio Frequency Amplifiers

RCA -6J7 - First Detector

RCA -6J7 - Oscillator RCA -6K7 - Intermediate -Frequency Amplifiers

RCA -6116 - Second Detector and Noise Limite?

RCA -6C5 - Audio -Voltage Amplifiers

RCA -6F6 - Power Output Tubes

RCA -523 - Full -Wave Rectifier

RCA -6J7 - Beat -Frequency Oscillator

RCA -6R7 - Automatic Volume Control

RCA -6J7 - Noise Suppressor

RCA -6E5 - Tuning Indicator

the signal frequency are essential antenna requirements for best reception. A three -terminal board with the terminals marked "Ai", "An", and "G" is provided on the rear of the chassis for connections to antenna and ground. The "G" terminal should always be connected to a good external ground.

For maximum performance in any one or two amateur bands, one of the antenna systems illustrated below is recommended. Essential parts, such as crossover insulators (Stock No. 43e71, transmission lines (Stock Nos. inµaq and 1243o1 and receiver coupling transformers (Stock No. 12420 may be purchased from your dealer.

PART III - OPERATION

6. Controls

All controls are located upon the front panel and are identified by adjacent markings.

(al Tuning aad Band Spread - The two large knobs to the right and ).eft of the dial are respectively the "Main" and "Band Spread" tuning knobs. The. latter covers a range of zo percent (7 5%) of the main dial scale reading.

(bl Volume - The Volume Control is the knob to the left below the "Band Spread" tuning knob. It is connected in the audio -frequency circuit, and the receiver output level is increased with clockwise rotation.

(cl Power and Fidelity - The Power Switch is combined with the Fidelity Control, the power being off in the counter -clockwise position.

The Fidelity Control provides attenuation of the higher frequencies. Full -range reproduction is obtained with the knob turned clockwise. Turning counter -clockwise introduces a capacitance in the secondary circuit of the driver transformer, which attenuates the high -frequency response and aids in the reduction of disturbing background noises.

Id) Range - The Range Selector in the center of the panel below the dial selects any one of the five scales of which the frequency limits are tabulated under "Part II Electrical Specifications". Turn the Range Selector knob to bring the required scale into the dial opening.

(el Electron -Ray -Tuning Tube - The green illuminated Electron -Ray -Indi- cator Tube (RCA -6X5) at the left of the dial near the top of the front panel is a visible guide to precise tuning. The deflection of the electron stream by the signal voltage causes a narrowing of the darker sector. Maximum deflection, (i.e., when the area of the light sector is at á maxinuml indicates that the receiver is tuned to exact resonance.

If) Selectivity Control - This introduces the crystal filter into the i -f circuit for single -signal reception of CW telegraph or telephone transmission. Crystal phasing is performed by means of an air -trimmer capacitor. Near the midway position marked "Max." the crystal circuit is balanced and maximum selectivity is obtained. This setting is characterized by minimum background noise. In the extreme clockwise position the crystal is short- circuited by means of the crystal switch. Other positions broaden the crystal selectivity curve on one side of resonance and cause a rejection dip on the other side. They are useful for phone reception through severe interference.

(g) Beat Frequency - The Beat Frequency knob at the extreme lower left is a heterodyne control governing the Beat Oscillator output frequency.. When set at its zero mid -position the Beat Oscillator frequency will approziiine zero beat with the receiver tuned accurately to an i' owing signal. The

calibration figures on either side of the zero position indicate the approximate frequency in kilocycles of the beat produced by the"combination of the

Beat Frequency Oscillator and the received signal tuned to exact resonance.

(h) Signal Input - The Signal Input Control is calibrated from i to

to,000 on a logarithmic scale. It is used in conjunction with the Electron - Ray -Indicator to obtain the approximate value it microvolts of any signal delivered to the receiver. This is accomplished by tuning the receiver to resonance by means of the Electron -Ray -Indicator and then rotating the Signal

Input knob fully counter -clockwise to reduce the voltage on the Electron -Ray tube. -"en by slowly rotating this control clockwise, a point causing only

a slit Reflection 11/64 inch; in the dark sector in the Electron -Ray -Indi- cator, will be obtained. The Signal Input scale reading will then be the ap-

proximate signal input value to the receiver, in microvolts. For code recep tion the correct setting will be at the point where the Electron -Ray -Indica-

tor just begins to flicker.

The absolute accuracy of Signal Input values depends upon the sen-

sitivity of the receiver. This in turn depends on proper alignment, condi-

tion of tubes, value of line voltage and similar factors. Relative readings,

however, between stations of different signal strengths give a correct com-

parison. Signal Input readings are also useful for reporting to the trans-

mission station for making tests on different types of antennas, for discov-

ering improvements in transmitters at distant locations, and for making

charts of signal strength variations.

Note: Naltigly the readings by 5 for obtaining values on band "T" operation.

See diagram label on shield on chassis for locations of tubes and grid leads. Ii) ARC - CM Selector - This is a five position switch on the right of

the dial and by means of this knob the operator may set the receiver for

Modulated or CM reception, either with or without Automatic Volume Control,

Power Consumption - iºo wails. according to requirements. On normal CW reception with the control turned

to "CW AVC ON" the time constants of the AVC circuits will be such that they

5. Antenm) will hold during intervals between characters. For slow -speed CW reception,

however, the time constant will not hold and the switch should be turned to

A most important factor in good reception is the antenna. Both "noise re- "CM AVC OFF" and the Signal Input Control used for adjusting the output

dieing" and "directional" properties as well as definite "length" to suit level. Furthermore the central point is a "Standby" position which keeps

the filaments of all tubes heated ready for immediate reception. This is

indicated by means of the Standby Light at the top right hand side of the

front panel.

Power Supply Ratings - Check with rating symbol on chassis.

;®John F. Rider, Publisher


RCA PAGE 9-159

RCA MFG. CO., INC.

Ij/ Noise Suppressor - The Noise Suppression Control is for reducing peaks of noise to a minimum. When used in conjunction with the Signal Input or Sensitivity Control and the Fidelity Control, the Noise Suppressor be - cones a very important and valuable device for reducing interfering noises that may impair the inteliigibility of radio reception. It is of particular value in minimizing interference caused by the ignition systems of airplanes and automobiles, dial telephones, and similar electrical apparatus. Inter- ference from rotating electrical machinery however is not eliminated by this device.

With a station properly tuned io by. the use of the Electron -Nay - Tuning -Indicator, then if the Noise Suppression knob is slowly rotated in a clockwise direction a point of noticeable distortion of the signal will eventually be reached. (If the signal is too strong it may be necessary to reduce the strength by means of the Signal Input Control in order to obtain a point of noticeable distortion on the Noise Suppression Control./ The knob should then be turned very slowly counter -clockwise' until the signal becomes clear. This point is the correct setting for the Noise Suppression Control for that particular signal.

This control is also effective for inter -carrier Noise Suppression and its use in this capacity requires the following procedure in order to obtain reception with full strength, maximum fidelity and minimum interference:

(11 Reduce Signal Input Control as low as possible, mean- while keeping receiver output at the desired level by means of the Volume Control.

(al Set receiver at a point where no signal is being re - ceived.

13( Adjust Noise Suppression Control till background noise is just audible.

1µI Tune in desired signal again.

This adjustment of the receiver is of particular value for intermittent signals or when it is desired to standby on a certain channel, the background output of the receiver being extremely Low on "no signal" and yet allowing full volume on "signal".

Ik( Phones - The Phone Jack is to the left of the front panel. When a

phone plug is inserted in this jack, it simultaneously connects a resistance load across the secondary of the output transformer in place of the voice coil of the electro -dynamic loudspeaker. It also connects the phones across the plate circuit of the output tube, a blocking_ condenser being used to

isolate the d -c voltage. The loudspeaker field which is employed as a filter

for the rectifier stage, still forms an active part of the circuit when using headphones. By inserting the phone plug part way in the jack both headphone

and loudspeaker signals may be obtained. The loudspeaker is connected to the

chassis by means of a cable and plug.

7. Dial

The Selector Dial provides for each major band a single clearly calibrated

sca'e in the upper dial opening. Each scale is clearly marked in megacycles.

The small lower dial opening gives calibration spread for accurate logging.

The mechanism is illustrated in Figure ii.

8. Tuning

The two r -f amplifiers (6E71, first detector (6,171 and oscillator 16J7) are tuned by two four -gang variable capacitors and controlled from two knobs.

The right hand knob controls the main tuning capacitor and the left hand knob the band spread capacitor. The band spread capacitor is connected in the circuit to cover a uniform percentage of band spread regardless of the frequency to which the receiver is tuned. Frequency readings on the dial scale obtained by rotation of the Main Tuning knob arg_gg11.ßccurate when the Band Spread Control is at zero - turned fully to right.

The Tuning limits for each of the five ranges are given under "Part II - Electrical Specifications". To tune the receiver for desired reception of modulated signals proceed as follows:

(a1 Turn Power Switch "On".

(bl Turn Range Selector to bring the desired scale into the Selector Dial opening.

(cl Set AVC - CW Control to "MOD. AVC ON".

Idi Advance Signal Input Control fully clockwise for maximum sensitivity.

(el Advance Volume Control clockwise until background noise is heard.

(fl Set Band Spread Control at zero - fully clockwise - and then rotate Main Tuning Control to a point just below desired frequency, such as at the low end of an Amateur Band. Now tune in signal with Band Spread Control. Turn slowly counter -clockwise, observe the Calibration Spread scale to obtain station location and then watch the Electron -Ray -Toning -

Indicator for point of resonance.

Igl Decrease volume as necessary and set Fidelity Control for pre,

ferred quality of reproduction. Full tone range reproduction is obtained with the knob set to its extreme clockwise position.

(hl Silent Tuning may be obtained by reducing the volume until no

signal is heard, and then tuning by means of the visual indications of

the Electron -Ray Tube.

(il Weak Modulated Signals - The Beat Oscillator may be used to ad-

vantage io locating weak, modulated signals: For this purpose it should be

MODEL ACR 111 Adjustment Notes

tuned exactly to the intermediate frequency of the receiver by turning the Beat Frequency Control to "o" so that an audio -frequency note of ascending pitch will be obtained on each side of resonance of the ocoming signal when the AVC - CW Selector is turned to "CM AVC OFF". Any carrier will then be tuned to exact resonance when the Frequency Control is adjusted for

"zero beat" and weak signals will be located almost as well as those of

greater strength because of the heterodyne "whistle" produced while passing through resonance. After proper adjustment has been made, turn AVC - CW Se- lector to "MOD. AVC ON".

Ijl CW Signals - For CW (code/ reception, the tuning procedure is the same as for modulated signals except that the Beat Oscillator performs a definite rather than incidental function. The Beat Frequency Control is set

not at zero, but slightly to either side so as to provide an audio -frequency beat note when the receiver is tufted to resonance with any carrier. Adjust the pitch with the Beat Frequency Control knob. Tura AVC - CW Selector to

"CW AVC OFF" when receiving slow speed CW transmission.

Iki If the interference is objectionable during reception, the Noise Suppression Control should be adjusted,as described under "Controls" Sec- tion 6, to its "correct setting" for that signal.

(11 Selectivity - The value of the Crystal Selectivity Control is most

evident on CW reception. Its importance should not be forgotten in phone re.

ception and for identification of weak stations which are normally lost in

the background noise. The curves IFigure13) should be studied carefully before operating the Selectivity Control.

The following suggestions also may be of value:

Locate the desired frequency or station with control at

"Crystal OFF," i.e., in its position of minimum selectivity, then ad,juat to obtain the desired degree of selectivity.

Tuning is extremely critical with control in the "Max." position and in consequence the movement of the Band Spread knob should be very slow and deliberate.

Heterodyne Control Setting

Connect a source of unmodulated carrier of the i -f frequency from the grid of

the RCA -6J7 first -detector to ground. Turn AVC off, crystal filter to maxi-

mum selectivity, sensitivity control to maximum, audio volume control par-

tially on and beat oscillator on.

Rotate the Heterodyne Control knob to left or right until the heterodyne beat

is heard.

Change the frequency of the unmodulated carrier from the test oscillator

very carefully for maximum deflection on the electron -ray -tube indicator. Re-

duce the signal input if necessary so that the electron -ray -tube does not com-

pletely close. The test oscillator is now adjusted to the same frequency as

the crystal filter.

Set the Heterodyne Control knob at its zero position and note whether the

heterodyne beat is at zero frequency. If not, proceed as follows:

(al Rotate the Heterodyne Control knob to obtain zero beat.

(b/ Loosen the knob set screw and turn loosened knob on shaft to its

"o" or vertical position.

Icl Tighten up set screw.

The Heterodyne Control is now adjusted to zero beat at the frequency of the

crystal filter.

In the event that the frequency drift is such that the zero beat position of

the knob is at or beyond the figure "a" on either side, or outside field of ro-

tation, the following adjustment is necessary:

(al Tura knob until the set -screw -stop on the knob control shaft, behind

the front panel, is approximately vertical, then loosen stop with screw driver.

(bl Tura core stud to obtain zero beat. Use a pair of padded long -nose

pliers to rotate the core stud in order to avoid injuring thread.

(cl Turn set -screw -stop over to left (facing front panel/ to its mid -

position, and adjust knob control shaft to allow 1/3a to i/16 inch clearance

between front panel and adjacent surface of knob.

(di Tighten set -screw -stop with pliers to grip core stud, then swing

stop to vertical and tighten securely with screw driver.

(el Proceed as first described for setting knob accurately to zero posi-

tion at zero beat.

Note: Do not Dull control shaft loose from bearing bracket when adjusting

core stud.

Beat Frequency Oscillator - The frequency generated by the Beat Frequency beat -oscillator (457 to µ63 kcl for CW reception is applied to the No. i diode plate of the RCA -6N6 second -detector through capacitor C63. This frequency mixes with the incoming intermediate frequency to produce an audio -frequency note which can be readily heard in the loudspeaker or phones. The movable magnetite -core, adjusted by the Beat Frequency Control, provides a variable inductance which acts as a vernier control for adjustment of the oscillator frequency over the required a -f range on either side of the intermediate -frequency signal. The plate and screen -grid voltage supply to this oscillator is turned on and off by means of the AVC - CW selector switch.

AVC - CW Selector - A five -position switch selects the type of reception and controls the Beat Oscillator and AVC circuits. The secondary of the audio transformer T1 is short-circuited in the "Standby" position.



160 RCA MODEL ACR 111 Circuit Data Transfarnnr HCA MFG. CO., INC.

Circuit Arrangement

A schematic diagram of the complete circuit is shown in Figure µ, a wiring diagram illustrating the wiring Layout of the radio chassis and front panel controls is detailed io Figure 5, and of the r -f tuner unit in Figure 6. The Loudspeaker wiring diagram and connections to chassis are shows in

Figure au, and the wiring of the Universal Transformer Sot rating "C" re-

ceivers in Figure 7. The circuit is based on the superheterodyne principle. It consists of two r -f amplifier stages, a first -detector (converter) stage, a separate oscillator stage, a crystal filter stage, two i -f amplifier stages, a diode -detector and noise limiter stage, an automatic -volume control stage, an audio voltage -amplifier stage, a noise suppressor stage, an audio driver stage, n power -amplifier stage, a beat frequency oscillator stage, and

a full -wave rectifier.

A doublet antenna, when connected to the proper input terminals of the re-

ceiver, is coupled to the control grid of the first RCA -6i7 r -f amplifier tube

through the tuned r -f transformer consisting of La, Lµ, L6, L8, Lao, Cµo, Cµa, and Cµ2. Ca, C3, Co, Cl, and C6 are plunger type air -trimmer capacitors for the respective bands - A, B, C, D, and B. The variable tuning capacitors, Cµl

and Cµa, are of the split -stator type and are controlled from the main tuning

knob. The band spread capacitor, Cµ°, is connected in serigm with Cµa, the

combination being in parallel with Cµa - the main tuning capacitor. Thus a

variable capacitance is effectively placed in series with Coo, and its value bears a definite ratio to that of Cµ2, the effective capacitance rouge of Cµo

being approximately a constant percentage of that of Cµa, irrespective of its

setting.

The range switch io the "A" position shorts out Cµ°, effectively paralleling Cµa and Cµa.

Separate coils are used for each band, and all primary windings not in use are

short-circuited, as well as all secondaries for lower frequencies.

The range switching of the r -f and detector circuits is similar to that of the

antenna circuits.

Separate windings are employed in the oscillator stage for each position of

the range selector. The inherent stability of this circuit provides minimum

frequency drift which is especially advaatageoua for high frequency reception.

The locally generated signal is capacitance coupled to the cathode of the

RCA -6J7 first -detector. ,

I -P Amplifier - The intermediate -frequency amplifier consists of two

RCA -6K7 tubes in a two -stage, transformer -coupled circuit. The windings of

all three i -f transformers are resonated by a combination of fixed capacitors,

and adjustable molded -magnetite cores (both primary and secondary) tune to

µ6o kc. The crystal filter .is introduced between the first i-ftransformer

secondary 1L39) and the control grid of RCA -61/7 first i -f amplifier tube by

means of the crystal switch S -nu, Figure µ.

Detector and Noise Limiter - The signal, as obtained from the output of

the last i -f stage, is detected by an RCA -686 twin -diode tube (No. a diode),

the useful audio -frequency (a -f) and direct -current (d -c) components appearing

across resistor Rau. The No. s diode of this same Radiotron is effectively

plated in shunt with Ran, with its anode biased approximately ao volts nega-

tive with respect to the cathode, by mesas of the bleeder resistor Rae. Ex-

cessive signals, or bursts of.static, of magnitude great enough to cause the

voltage across Ran to. exceed approximately uo volts will cause the No. u

diode to draw current, or present a low impedance across Rua, thereby acting

as a noise limiter.

Noise Suppressor - The Noise Suppressor consists of an RCA -6J7 whose plate circuit effectively shunts the input circuit of the audio -driver stage, and a means of making the shunting plate impedance very high ter desired signals, and very low for undesired noise impulses of short duration and ampli- tude greater than the desired signal. The plate impedance will be very high for control -grid bias values sufficient to cause plate -current cut-off, and low for bias values which will permit plate current to flow. The audio signal appearing across resistor R37, and consequently across the RCA -6C3 audio driver input circuit will, therefore, depend upon the ratio of the plate impedance of the Noise Suppressor Tube to the resistance of R36, the series combination being essentially a voltage -dividing network. When the plate impedance is high, the ratio will be high, and' practically the total audio vol-

tage appearing across resistors Ria and R33 will appear across the plate circuit. The converse will occur with a low plate -impedance. In operation, the

bias is adjusted just below the point of plate current cut-off by means of

the movable arm on Raz. Noise impulses of short duration, tending to make the grid more positive, will canse the plate impedance to be low during these

impulses with "a consequent reduction of input to the audio driver during theme

intervals.

Electron -Ray -Tuning -Indicator - An RCA -6E5 cathode-ray tuning tube is

used as a means of visually indicating when the receiver is accurately tuned,

to the incoming signal. This tube consists of an amplifier section and a

cathode-ray section built in the same glass envelope. A portion of the vol-

tage developed across resistor Rua is used to actuate the grid of the ampli-

fier section. Maximum voltage is applied to this grid when the receiver is

tuned to resonance with an incasing carrier. This condition is evidenced by

minimum width of the dark sector on the fluorescent screen.

Audio System - The control grid of the RCA -6C5 first audio amplifier is

connected directly to Rau, the tube functioning as a diode -biased voltage -

amplifier. The output of this tube is resistance -capacitance coupled to the

control grid of the RCA -6C5 audio -driver, potentiometer R38 functioning as the volume control. The output of the driver stage is transformer coupled,

through Tito the control grids of the RCA -6F6 push-pull, power -output tubes.

The output of this stage is transformer coupled, through Ta, to the voice coil

of the electro -dynamic loudspeaker. Insertion of a telephone plug in the head-

phone jack Ji disconnects the voice coil from the secondary of Ta and substi-

tutes a dummy resistor Rae in its place. The tip and sleeve of the plug are

connected across the input circuit of one of the RCA -6F6 power tubes, through

capacitor C74, for headphone reception.

The "Fidelity" or tole control comprises the combination of capacitor C78

and variable resistor Ron shunting the secondary of Ti.

Automatic Volume Control - The operation of the RCA -6R7 Automatic Volume

Control Tobe and associated circuits is as follows:

Under conditions of no signal, the cathode current flowing through

resistor Ru7 develops a voltage across R27 of approximately a9 volts. This is

in opposition to the approximate ao volts drop across the bleeder resistor Rea

thereby making the cathode approximately 9 volts positive with respect to

chassis -ground, or to the anode DP -a. When signals are present, a portion of

the i -f voltage is applied to anode DP -a, through Capacitor C9o, for rectifica-

tion. The d -c voltage which develops across resistor Ra8 is applied to the

control grid of the RCA -6R7 through a resistance -capacitance filter, makiag the

grid more negative with respect to cathode, in turn reducing the cathode cur-

rent or voltage drop across Rai, and consequently making the cathode leas posi-

tive with respect to anode DP -1 than under the condition of no signal. Suf-

ficient signal will cause the cathode to become negative with respect to

diode Dp-a; current will then flow through this circuit causing a voltage drop

across Rao, which is applied as automatic control -grid bias to the r -f, first-

letector, and i -f tubes through suitable resistance -capacitance filters.

SLACK

TERM. ROAM)

GEED/

RED

RED -!LACK

LACK

-YELLOW

PRIMARY

BLACK -RED TR. LACK -RED TR. ySRMAIIE LEAD

RED -BLACK

O ac.. ""..

M -alma? -n

FILAMENTS -B' YELLOW

REGT. nL.

Ynu.OW nIlmWN

MACK-BRows

aROWN

RECT1FtER FILAMIDET s -

PRIMARY RESISTANCE -14.5 ONMS TOTAL

SECONDARY RESISTANCE - 326 OHMS TOTAL

F:Rwo 7-Udverd Trawdormor

Perform alignment id proper order tabulated below, starting with No. a and

following all operations across, then No. a, etc. Adjustment location are shows by Figures 8, 9 and io. Notes are provided in the left side of

the lower r -f unit shield to enable a tuning check with the RCA Stock

No. 6679 Tuning nand.

The RCA Stock No. 1a636 Adjusting Tool has been designed for loosening and

-etightening lock -nut and for nuking the plunger adjustment on the plunger-

.ype air -dielectric trimming capacitors.

Cathode-ray alignment is preferable; the connections to the chassis are

shown on Figure 5. If an output indicator is used, codnect it across the

loudspeaker voice coil and adraste the receiver volume control to full -

volume position. Turn AYC - CR Selector to "MOD. AVC OFF"; Signal Input

clockwise. Turn Noise Suppression control to extreme counter -clockwise posi-

tion. Adjust Signal Input control to "moo". Set AVC - CR Selector to

"MOD. AVC OFF".

Connect the "Low" output terminal of the test oscillator to the receiver chassis for all alignment operations. Regulate the output of the test oscillator so that the signal applied to the receiver is the minimum which will

permit an accurate output observation.

The term "Dummy Antenna" means that device which must be connected between the

"High" test oscillator output and the point of connection to the receiver in

order to obtain ideal alignment. "No signal, 550-75o kc" means that the re-

ceiver should be tuned to a point between 550 and 750 kc where no signal or

interference is received from a station or local (heterodyne) oscillator.

'Dial setting for image check" means that after alignment is performed follow-

ing across in proper sequence; the receiver dial should be shifted to the set,

ling specified, without making any other changes, except possibly increasing

test oscillator output, at which point image signal should be received. If

the image is not received at this dial setting, but at a point approximately

[8µo kc. below this point i0 the case of (sal or 18µo kc above this point in

the case of 1161, -st will indicate that the oscillator has been improperly

adjusted.



RCA PAGE 9-161

NODE ACR 111 RCA MFG. CO., INC. Parts List

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'AGE 9-162 RCA

MODEL ACR 175 Transformer and Antenna Data.

r- RED

L

BLACK

BLUE

BLUE

RCA )I FG. CO., INC.

GREEN

GREEN BROWN

RECTIFIER FILAMENT 5 VOLTS

RED

RECTIFIER FILAMENT 5 VOLTS

l'ri. Res. --5.79 ohms. total Pri. Res. -7.54 ohms, total Sec. Res. -420 ohms, total Sec. Res. -268 ohms, total

(a)-Standard Power Transformer (b)-Universal Transformer

Figure 8-Transformer Wiring and Connections.

Band Length

each side Coupling Transformer Meters Feet Type Stock No.

160 130 Aircraft Doublet M.I. 5782 80 63 Aircraft Doublet M.I. 5782 40 33 Standard Doublet 4743 20 161/2 Standard Doublet 4743 10 8 Standard Doublet 4743

5 4 Standard Doublet 4743

33 FT. 33 FT.

TRANSMISSION LINE

TO STANDARD DOUBLET TRANSFORMER

(a) Single Doublet Antenna for 40 Meter Bond 33 FT. 33 FT.

30°tAPPROX.)

'-TRANSMISSION LINE


(b) Double Doublet Antenna for 40 and 20 Meter Bands 130 FT. 130 FT.

't s,s 30°(APPROX.)

`TRANSMISSION LINE

TO AIRCRAFT DOUBLET TRANSFORMER

(C) Double Doublet Antenna forl60 and .80 Meter Bands

BLACK

OUTPUT TRANS.

0.3n

376.,

d 50- 6 O 2 Ce p

VOICE COIL

NEUT. COIL

FIELD

COIL

TO

CHASSIS

L. Jl YELLOW BROWN 6&BLACK

Figure 7-Loudspeaker Wiring and Connection Diagram

33 FT.

TRANSMISSION LINE

33 FT.

a / 30'(APPROX)

BLACK

30 (APPROX.)


(d) Triple Doublet Antenna for40,20& 10 Meter Bands

Figure 4-Dipole Antenna Crossover Connections.



RCA PAGE 9-] ß3

RCA MFG. CO., INC.

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164 RVA MODEL ACR 175 Chassis Wiring

nw w.0 x Mora.

RCA MFG. CO., INC.



RCA PAGE 9-165

RCA MI+1G. CO., INC.

41 NT r y 1\ L0_

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Power -Supply Ratings.-See rating symbol on chassis. Frequency

Symbol Voltages (cycles) B 105-125 25-60 C 100-130; 140-160; 195-250 40-60

As shipped from the factory, rating "C" instruments are connected for 225-250 volts unless promi- nently specified otherwise on instrument. Any of these, however, can be converted for operation at 100-117, 117-130 or 195.225 volts when required. Three taps are provided on the primary of the power transformer, a diagram of which is given in Figure 8. All taps are brought out to a terminal board on the top of the transformer and conversion can be made without removing chassis.

1> F. -is 1 1d W r7tall m0- '

J

Tubes 1 RCA-6K7--Radio-Frequency Amplifier. 1 RCA-6L7-First Detector. 1 RCA -6J 7-Oscillator. 2 RCA-6K7-Intermediate -Frequency Ampli-

fiers. 1 RCA-6H6-Second Detector and A.V.C. 1 RCA -6J 7-Beat-Frequency Oscillator. 1 RCA-6F5-Audio-Frequency Amplifier. 1 RCA-6F6-Power-Output Amplifier. 1 RCA-5Z4-Full-Wave Rectifier. 1 RCA-6E5-Tuning Indicator. See diagram on label inside cabinet for locations

of tubes and grid leads.

MODEL ACR 175 Voltage,Tr immer s

Power Ratings Band Spread

O C K

OMN--I

t; R R F L C

N N - 4p ci2 o

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O OD OOO D N .-1 N

X ~

S e

V



'AGE 9-16(i RCA

LDDEL ACR 175 Alignment,Controls Circuit Data



RCA PAGE 9-167

=q4=1Wn4at ryryñg«ñ««:i .vlñétilñMM. 5 , n = .g474 a



168 RCA

M)DEL ACR 175 Parts List

RCA MFG. CO., INC.

STOCK No. DESCRIPTION LIST STOCK

PRICE No. DESCRIPTION LIST PRICE

11300 Resistor -33,000 ohms -carbon type, 1/10 - watt (R8) -Package of 5 .75 DRIVE ASSEMBLIES

8067 Resistor -39,000 ohms -carbon type, 1/2 -watt (R9) -Package of 5 1.00 11952 Dial -Station selector dial scale .78

11646 Resistor -47,000 ohms -carbon type, %-watt 12116 Drive -Variable tuning condenser drive (R25) -Package of 5 1.00 assembly -Comprising reflector, bracket,

11282 Resistor -56,000 ohms -carbon type, 1/10. drive, hub and gear assembled 1.35 watt (R7, R18) -Package of 5 .75 11982 Fastener -Station selector dial scale fastener

5029 Resistor -56,000 ohms -carbon type, I/; -watt -Package of 25 (R30) -Package of 5 1.00 4827 Gear -Spring gear assembly for vernier

.42

8064 Resistor -82,000 ohms -carbon type, 1/2 -watt pointers 1.25 (R36) -Package of 5 1.00 11228 Gear -Vernier pointer drive gear .42

3118 Resistor -100,000 ohms -carbon type, I/4 - 11303 Indicator -Station selector vernier indicator

11281

11323

11172

watt (Rl, R4, R12, R13, R17) -Package of 5,

Resistor -100,000 ohms -carbon type, 1/10 - watt (R24) -Package of 5

Resistor -270,000 ohms -carbon type, %- watt (R29) -Package of S

Resistor -470,000 ohms -carbon type, %- watt (R31) -Package of 5

1.00 4520 4340

.75 12577

1.00 12117

1.00

pointer Indicator -Station selector indicator pointer Lamp -Dial lamp -Package of S' Screw -8-32 x 1l/ in. slotted set screw for

drive assembly -Package of 10 Shaft -Dual speed drive shaft for variable

condenser drive assembly -Comprising

.22

.18

.60

.15

11452

12013

Resistor -470,000 ohms -carbon type, 1/10 - watt (R19) -Package of 5

Resistor -1 Megohm - carbon type, 1110 .75

11222

shaft, drive, spool, spring and washer - assembled

Socket -Dial lamp socket .36 .18

watt (R38) -Package of 5 .75 3033 Resistor -1 Megohm-carbon type, I/ -watt MISCELLANEOUS ASSEMBLIES

(R20) -Package of 5 1.00 11626 Resistor -2.2 Megohm-carbon type, I/ -watt 11192 Clamp -Tuning tube mounting clamp .12

(R22) -Package of 5 1.00 12122 Escutcheon -Station selector escutcheon... .60 11936 Resistor -4.7 Megohm-carbon t y p e -t/. 12130 Foot -Rubber foot assembly -Package of 4. .25

watt (R23) -Package of 5 1.00 6614 Glass -Station selector dial glass .30 12090 Sensitivity Control (RS) 122 12128 Jack -Telephone jack (J1) 1.02 4669 Screw -8.32 x 5/32 -in. set screw for exten- 12124 Knob -Heterodyne adjustment or selectivity

sion shaft, Stock No. 12105 -Package of control knob -Package of 5 .70

12103

12105

10 .

Shaft -Extension shaft for phasing control, Stock No. 12089

Shaft -Extension shaft for beat -oscillator coil adjustment

25 12123

.15 12129

15

Knob -Power (Tone), signal input, AVC, range, volume or beat -oscillator control knob -Package of 5

Knob -Station selector knob assembly - Comprising 1 main and 1 vernier tuning knob -Package of 5

.70

2.10 5249 Shield -Antenna, detector or oscillator coil 4340 Lamp -Pilot lamp -Package of 5 .60

shield .20 12120 Panel -Control panel 1.68 12112 Shield -First or third I.F. transformer shield .28 12121 Panel -Front panel assembly, complete 5.45 12111 Shield -Second I.F. transformer shield.... .28 4678 Ring -Spring ring for station selector dial 12110 Shield -Top cap shield for Radiotron 6J7 glass -Package of 5 .34

beat -oscillator .14 12127 Screw -Chassis mounting screw assembly - 11195 Socket -S -contact 5Z4 Radiotron socket... .15 Package of 4 .18 11313 Socket -S -contact 6F5 Radiotron socket.... .18 12126 Screw -6-32 x %-in. fillister head screw - 11198 Socket -7 -contact 6L7, 6F6, 6H6 second I.F. Used to hold front panel -Package of 10. .42

or R.F. 6K7 Radiotron socket .15 12125 Screw -8.32 x 5/16 -in. cupped point set 12113 Socket -7 -contact 6J7 beat -oscillator Radio- screw for knob, Stock No. 12124 -Pack-

tron socket .16 age of 10 .20 12114 Socket -7 -contact 6J7 oscillator Radiotron 4982 Spring -Retaining spring for main tuning

socket .16 knob in Stock No. 12129 -Package of 10. .26 11196 Socket -8 -contact first I.F. 6K7 Radiotron 11349 Spring -Retaining spring for knob, Stock

socket .15 No. 12123 -Package of 5 .15 11381 Socket -Tuning tube socket and cover .45 11222 Socket -Pilot lamp socket .18 12106 Spring -Retaining spring for beat -oscillator

12374 shaft, Stook No. 12105 -Package of 5....

Switch -Beat -frequency oscillator switch .15 REPRODUCER ASSEMBLIES

12109

12088

12091

5238

12095

12101

12331

12096

12097

(S14) Switch -Automatic volume control switch

(S10) Switch -Combination power, tone and stand-

by switch (S13, S15, S16) Switch -Range switch (Si, S2, S3, S4, S5,

S6, S7, S8, S9) Terminal -Antenna terminal board and

clip Transformer -First intermediate frequency

transformer (L17, L18, C33) Transformer -Power transformer, 105.125

volts, 25.60 cycle (T1) Transformer -Power transformer, 105.130,

140-160, 195-250 volts, 50-60 cycle Transformer -Second intermediate frequency

transformer (L19, L20, C41, C42) Transformer -Third intermediate frequency

transformer (L21, L22, C46, C47, C48, R18, R19)

.55 11954

.30 11231 8060

1.00 11257

3.55 11254

.14 11233 11235

1.50 11953

5.20 9658

5.15 11253 11886

1.85

2.52

Board -Terminal board assembly, with eyelets and lead wire clips

Bolt -Yoke and core assembly bolt and nut Bracket -O u t p u t transformer mounting

bracket Clamp -Cone center suspension clamping

nut and screw assembly -Package of 5 Coil -Field coil (L26) Coil -Neutralizing coil (L24) Cone -Reproducer cone (L25) -Package of

5 Connector -6 -contact male connector for

reproducer .

Reproducer complete -Less baffle assembly Transformer -Output transformer (T2) Washer -Spring washer -Used to hold field

coil securely -Package of 5

.14

.16

.14

.25 2.00

.30

3.50

.28 6.16 1.56

.20

11649 Trap -Wave -trap (L27, C70, R39) 1.15 12087 Volume Control (R27) 1.84

The prices quoted above are subject to change without notice



RCA PAGE 9-169

1.

2

Cl 0.1 MFD.

} i

! 1_

BLACK TO L3 ONO. +

2.5ná OS C. g COI ÿa _ 2

19

IF PEAK 455 KC

ANT. COI L

- BLACK RED -BLACK

-BROWN -BROWN-BLACK

CABLE PLUG

RS -VO L.

COUNR & POWER SWITCH -S

BLACK

s

C 0.1 MFD

C6 100 - MME

6K7 I.E.

\\ R7 470n R1 47on 1sT.I.F.

,TRANSE ,r X

LS LIS IB IBA

R2 56,001

OCT LOO MME. TX

Ce .05 M FO.

5G MME

RCA MFG. CO., INC.

6QT-G 1 - Z DET. A.F.= & A.V.C. ' R8

68n 0 2NoI.F. \\0/1"\ TRANSE. CIO

O

C9 T á 100 I--2-, MMF.'L7

Ien

3 VOA.",

IO,000n

óm.L

L8 1 CC~1

180 MME.

B I

L4-Bn

'1 1

160 I 517 MME. I MME

C8 3 15 MME

I

ADJUST FOR MAX. CAPACITY

R12 22,000n

SPEAKER CONNECTIONS SPEAKER PLUG

GREEN -T 2VOICE CO; L

®q LINK

6.3V. A.C.

6K6 -G OUTPUT

C22

HUM NEUT.COIL L10

R4 2 2 MEG.

/ R6 2.2MEG.

DPI

c133 .01 MFD.

DP

BOTTOM VIEW OF -- TUBE SOCKETS (R9

390

©© O'0 0aß

C14 .01 MFD.

I C12 .0035T MFD.

VOL.CONTR. R5- 220,000A

12

11

0 1-

4 5

S1

RIO 270,000n

470,000n

MODEL U 111 Sohematio,Voltage Chassis Wiring

6K6 -G OUTPUT

RADIO-PHONO.SWITCH 1TERM.1&12 NEXT TO BASE

SWITCH VIEWED FROM

1 FRONT OF CHASSIS

S

SWITCH IN MAX. COUNT ER -

CLOCKWISE POSITION.1. POSITION1-RAD10 MIN.HIGHS POSITION2-RADIO MAX.HIGHS PO S ITIO Na3-PHO NO.MIN. HIGHS POSI T ION 44 -PH ONO.MAX.H IGHS

T2

LIO HUM NEUT.

COIL

I C22 .006 MFD.

T1 GREEN

RED --il GREEN

BROWN - -

9.1n BLACK

BROWN

RED BLUE -4 - TO HEATERS AND DIAL LAMP.

BLACK BLUE

PLUG LINK FIELD

6b6`- \ 1300n

CaO 10 MFD.-

\\

5Y3 -G RECT.

PICK-UP PLUG 9

CRYSTAL. PICK-UP Y

BQ000n AT 1000 C.P.S.

- C 21 nVV V LJ Vvv - MFD MOTOR

J 52 voLFrequency Range 540-1,720 kc(oti u111

coNTRtR-F Alignment Frequency. 1,500 kc (osC., ant.) © RCAMFG.CO.,INC.

Intermediate Frequency... 455 kc P-84277-2

s ---MOTOR PLUG

53 ON PHONO. SWITCH. OPEN POSITION 15 ON 1 AND 2. CLOS 40 POSITION IS ON 3 AND 4.

BROWN -BLACK

BL` CK

TO MOTOR PLUG

235V..i250V.

e C14

(l 0, OV.

17V

2.5V.

6.3V.

607-G 2ND. DET.,

AF.& A.V.C. -'

(165V.1 U

BLUE

BROWN

RADIO- PHONO. SW.,

BLACK

2. I.F. TRANSF. -

CATHODE RAY OSCILLOGRAPH VERTICAL 'HI" TO THIS TERM. CONNECTIONS {VERTICAL "0" TO CHASSIS

350V. AC

Ti 350V.

AC O\?52v.

1

5V. AC

5Y3 -G RECT.

O o

BLACK. TO PICKUP SOCKET

PHONO. MOTO SW. -S3

© PRI ADJ. 455KC

C19

250V. 0 112V.

0) LUZ unuv

T ©% © K

6K7 I.E.

SV.

GREEN

5.3V. AC

1 N

C21 - RED -

WHITE TR

],ELEC. CAP.

BLACK

RC2021 C

GREEN

U-111 © RCA MFG. CO., INC P-54594-0 .BOTTOM VIEW -REAR OF CHASSIS

*Note: Values with star (*) are operating voltages. Values not starred are actual measured voltages.

Measurements made to chassis unless otherwise indicated. Measurements made with set tuned to quiet point, volume

control at minimum, using 1,000 -ohm -per -volt meter, having

r 1sTI.F. TRANSF.

, C4 1 -

CATHODE CURRENTS 12.5 MA. 8.9 MA.

.34 MA. 31.5 MA.

TOTAL RECTIFIEDB CURRENT 6SMA.

GANG COND.

C2C

CI7 ADJUST FOR MAX.CAP.--.

OSC. COIL

C3 ANT.' %1500

KC.

CI6 05G

L5 112V.

PRI. ADJ. 455 H 250V.

6A6 Iwo DET. E. OSC.

C18 1500 KC.

- BLUE

112V.

6.3V AC 6V.

ò z N cd

ranges of 10, 50, 250, and 500 volts. (Use nearest range above the specified measured voltage.)

Values should hold within approximately ± 20% for 117 volt 60 -cycle su . ly.



l'AGE 9-170 RCA

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RCA PAGE 9- 17

rá)DELS U119,U122E,U124

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RCA MFG. CO., INC. Schematio,Specs.

'MOTOR

Type Self-starting induction

Turntable Speed..78 r.p.m. (adjustable)

Record Diameter. .. 10 -inch or 12 -inch FREQUENCY RANGES "Standard Broadcast" (A) 540.1,720 kc "Medium Wave" (B)....... 2.3.7 me "Short Wave" (C) 7-22 me

IF PEAK 455 KC

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172 RCA RdJDEIS Ú113,U122E,U124 Voltage,Chassis Wiring Transfarmers,Lead Dress

RCA MFG. CO., INC.

* NOTE: Values with star (*) are operating voltages in

circuits with high series resistance. The actual measured volt-

ages will be lower, depending on the voltmeter loading. Measurements made to chassis unless otherwise indicated,

with set tuned to quiet point and volume control at mini, mum. Values should hold within ±20% with 117 -volt a -c supply.

=1

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NOTE INSERT CONNECTOR BET((CENVERVANOMMON

D CONTACTA[T AC CORRESPONDING TO PREVAILING POWER SUPPLY RATING.


< n V7

T) GREEN - ERECT FIL.

GREEN - BROWN-

RECT. PLATE 660 -n-

BLACK-MOWN

DROWN - BLUE -

AMP. CIL. BLUE - VELLO

BLACK-

Above - Universal Power Transformer Connections. (110 -volt supply for the Vic - trola motor is obtained by connecting the motor to the red and the red black leads.)

6 41

5N-800

nozr

Above-Replacement Uni- versal Power Transformer. (Stock No. 31446.)

MD-BLACK-ERECT. FIL.

PLUG BLPiCN PLRTE,

9 oiHeOw,rpLtCK SCREENcFC

eR CIE

Above - Connections and Colors of Loudspeaker and Cable.

RCA PAGE 9-173 MODELS U119,U122E,U124

RCA MFG. CO., INC. Tuner Data,Phono.Data

ADJUSTMENTS FOR ELECTRIC TUNING These models have eight push buttons. The left-hand

button is a Victrola switch. The right-hand button connects the gang condenser for manual tuning. The other six buttons are for electric tuning of six different stations in the standard -broadcast range. The station buttons connect to separate magnetite -core oscillator coils and separate antenna trimmers which must be adjusted for the desired stations. Use an insulated screwdriver or alignment tool such as RCA Stock

Ctl tOMC\

RECT. czs G.IMC C2s% ISOOKC

cao 20 MC

L11 fRc. ADJ. 69 K;

C29 ANT.

C20 OSC.

US SEC.ADJ. 435 KC

1ST. DET. e, OSC.

OSCILLATORCORR{+O6 OS 04 ANTRNNATRMNRIN

I. F

03 02 01 ZwoDET.

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I IBO KC AUDIO

OUTPUT

ANTENNA GROUND 5N -819-I U-119,

Tube and Trimmer Locations

DRUM

IND1C05 IVW CORD

DRUM OtlYt CORO 31514 IN ReOR GROWS OFD RUM

NIICTROLA JACK

No. 31031. Allow at least five minutes warm-up period before making adjustments.

Use one or two feet of wire as an antenna to ensure sharp peaking.

The procedure is as follows: 1. Make a list of the desired six stations, arranged in

order from low to high frequencies. 2. Push in the dial -tuning button, and manually tune in

the first station on the list. 3. Push in station button No. 1 (second from left) and

adjust No. 1 oscillator core (L37) to receive this station. Screw the core all the way in, to lowest frequency, and then unscrew slowly until station is received.


Clockwise adjustment of cores and trimmers tunes the circuits to lower frequencies.

5. Adjust for each of the remaining five stations in the same manner.

6. Make a final careful adjustment of the oscillator cores and antenna trimmers.

MEDIUM VOLUME TONE

OFF

BPO.NASI SNORT WAVE

RANGE TUNING

TONE~- I l l . , 6

O,0 POWER RTONE 'VOL UM RANGE -TUNING

CONTROL PUSH BUTTON CONTROLS CONTROL

Location of Controls

PULLEY The left-hand push-button is a Victrola switch.. 31373

-- - The right-hand push-button is for dial tuning.

KNOB ST £ PULLEYURI 3,368

ulsliño

OVUM SHOWN WITH GING FIT MRXIMUM CRPRCITY

Arrangement of Drive Cords for Tuning Condenser and Dial Indicator

MOTOR BOARD

MOTOR MOUNTING SCREw3

METAL WASHER AND RUBBER SPINDLE PIECE

OIL HOLES

TURNTABLE SWITCH

NEEDLE HOLE

NEEDLE GAUGE PLATE

PICKUP ARM

PICKUP

TURNTABLE

NEEDLE SCREW

Top View of Motor Board

USED NEEDLE BOX

NEEDLE EJECTOR TAB

ADJUST SWITCH TO TRIP WHEN NEEDLE

IS ON 134" RADIUS FROM 4 OF MOTOR SP NDLE

Adjustment of Automatic Switch / v ` BRAID

SOT TOM po OF

PICKUP

J L {O r-BLUE

SHORTING SWITCH

Pickup Connections



hUDEIS U119,U122E,U124 Alignment,líotor Data RCA MFG. CO., INC. Parts

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(23:i

! 08ß80 J

MODELS 810K,810K1,810T es RCA1Ih(t. CO.. INC. Schema.tic,nTotes

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176 RCA MODELS 810K,810K1,810T Chassis Wiring,Coils



RCA PAGE 9477

RCA MFG. CO., INC.

Electrical Specifications FREQUENCY RANGES

"Broadcast" (A) 530-1,720 kc "Medium Wave" (B) 2,100.6,800 kc "Short Wave" (C) 6,800-22,000 kc Intermediate Frequency 460 kc

RADIOTRON COMPLEMENT (1) RCA -6K7 R -F Amplifier (2) RCA -6J7 Heterodyne Oscillator (3) RCA -6L7 First Detector (4) RCA -6K7 Intermediate Amplifier (5) RCA -6H6 Second Detector and A.V.C. Pilot Lamps (4) Mazda No. 46, 6.3 volts, 0.25 amp.

POWER SUPPLY RATINGS Rating A Rating B Rating C

POWER OUTPUT Undistorted 10 watts Maximum 12.5 watts

MODELS 810K,810K1,810T Specifications,Voltage Tr immer s

R -F ALIGNMENT FREQUENCIES

"Short Wave" (C) 20,000 kc (osc., det., ant.) "Medium Wave" (B) 6,000 kc (osc.) "Broadcast" (A) 600 kc (osc.), 1,500 kc (osc.)

(6 ) RCA -6N7 Phase Inverter A -F Amplifier (7) RCA -6F6 Power Output (8) RCA -6F6 Power Output (9) RCA -6G5 "Magic Eye" Tuning Tube (10) RCA -5T4 Full -Wave Rectifier

105-125 volts, 50-60 cycles, 135 watts 105.125 volts, 25-60 cycles, 135 watts

100.130/140.160/195.250 volts, 40.60 cycles, 135 watts

LOUDSPEAKER

Type. Impedance (v.c.)

Electrodynamic 2.2 ohms at 400 cycles

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Figure 2-Radiotrou Socket Voltages, Coil, and Trimmer Locations Measured at 115 volts, 60 -cycle supply -Tuned to approximately 1,000 kc ("Standard Broadcast") -

No signal being received -Volume control minimum

Note: Two voltage values are shown for some read- Voltage values as specified should hold within ±20% ings. The value shown in parentheses with asterisk (C) when the receiver is normally operative at its rated line indicates operating conditions without voltmeter Loading. voltage. To duplicate the conditions under which the The other value (generally lower) is the actual measured voltages were measured requires a 1,000 -ohm -per -volt d -c voltage and differs from the value shown in parentheses meter, having ranges of 10, 50, 250, and 500 volts. Use because of 'the additional loading of the voltmeter the nearest range above the specified measured voltage. A -c through the high series circuit resistance. voltages were measured with a corresponding a -c meter.



178 RCA MODELS 810K,810K1,810T Alignment,Sooket RCA TIFG. Phono. Notes

Service The various diagrams of this booklet contain such- infor-

mation as will be needed to isolate causes for defective operation if such develops. The ratings of the resistors, capacitors, coils, etc., are indicated adjacent to the symbols signifying these parts on the diagrams. Identification titles such as R1, L1, Cl, etc., provide reference between the illustrations and Replacement Parts List. The coils, transformer windings, and reactors are rated in terms of d -c resistance to permit continuity checks.

Loudspeaker.-Centering of the loudspeaker is made in the usual manner with three narrow paper feelers after first removing the front dust cover. This may be removed by softening its cement with a light application of acetone, using care not to allow the acetone to flow into the air gap. The dust cover should be cemented back in place with ambroid upon completion of adjustment.

Phonograph Attachment.-A terminal board is provided for connecting a phonograph into the audio amplifying circuit. RCA Victor Models R-93, R -93-A, R-93-2, or R-94 Record Players should be connected as follows: Remove link between terminals 1 and 2 on terminal board. Connect green wire in Radio -Record switch cable to terminal 1, yellow to terminal 2, and shield extension to terminal 3. Tape unused red and blue leads separately. Connect a 2 -conductor twisted cable between the Record Player binding posts and the screw terminals on Radio -Record switch. If additional volume is desired, connect an RCA Stock No. 9632 transformer between the two conductor twisted cable and the screw -

CO., INC.

Data terminals on Radio -Record switch as follows: yellow and brown transformer leads and one side of twisted cable to ground screw -terminal on switch; black transformer lead to other side of twisted cable; and blue transformer lead to other screw -terminal on switch.

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Alignment Procedure Calibrate the tuning dial by adjusting main dial pointer

to the low -frequency (end) calibration mark on dial with the gang tuning -condenser plates in full -mesh position; then adjust the small (vernier) pointer to "O." These are friction adjustments.


Cathode-ray alignment is highly preferable; the connections to the chassis are shown on figure 4. If an output indicator is used, connect it across the loudspeaker voice -coil and advance the receiver volume control to full -volume position.

Connect the "low" output terminal of the test oscillator to

the receiver "G" (ground) terminal for all alignment operations. Regulate the output of the test oscillator so that minimum signal is applied to the receiver to obtain an observable output indication. This will avoid a -v -c action.

The term "Dummy antenna" means the device which must be connected between the "high" test -oscillator output and the point of connection to the receiver in order to obtain ideal alignment. "No signal, 550.750 kc" means that the receiver should be tuned to a point between 550 and 750 kc where no signal or interference is received from a station or local (heterodyne) oscillator.



Selector Receiver

Dial Setting Circuit to Adjust

Adjustment Symbols



Frequency Setting

1 6K7 I -F Grid Cap .001 Mfd. 460 kc "A" Left No Signal


2 6L7 Det. Grid Cap

.001 Mfd. 460 kc «A" No Signal 550-750 kc


3 Ant. Term. 300 Ohms 20,000 kc "C" Right 20,000 kc "C" Osc. C20 Max. (peak) *

4 Ant. Term. 300 Ohms 20,000 kc "C" 20,000 kc "C" Det. C9 Max. (peak) t 5 Ant. Term. 300 Ohms 20,000 kc "C" 20,000 kc "C" Ant. C2 Max. (peak) $

8 Ant. Term. 300 Ohms 6,000 kc "B" Center 6,000 kc "B" Osc. C23 Max. (peak) *

7 Ant. Term. 200 Mmfd. 600 kc "A" Left 600kc "A" L -F Osc. L13 Max. (peak)

8 Ant. Term. 200 Mmfd. 1,500 kc "A" 1,500 kc "A" H -F Osc. C26 Max. (peak)

9 Ant. Term. 200 Mmfd. 600 kc "A" 600 kc "A" L -F Osc. L13 Max. (peak)

10 Ant. Term. 200 Mmfd. i,500kc "A" 1,500 kc "A" H -F Osc. C26 Max. (peak)

* Use minimum capacity peak if two peaks can be obtained. Use maximum capacity peak if two peaks can be obtained.

t After this adjustment, check for image signal by shifting receiver dial to 19,080 kc.

RCA PAGE 9-179 P.VDELS 810K,810K1,810TI

RCA MFG. CO., INC. Load Dress,Parts

Precautionary Lead Dress.-( 1) Keep leads to ac switch dressed away from antenna coil and trimmer C2. (2) Keep all filament leads twisted. (3) Keep yellow lead from term. E of 2nd i -f trans. to phono. term. board as short as pos. sible. (4) Keep leads of C21 as short as possible. (5) Dress shielded lead from volume control to phono. term. board against side of chassis and away from 6L7 socket. (6) Yellow lead from 6J7 oscillator cathode to dummy terminal on 6L7 socket must be dressed away from chassis base and from brown filament lead. (7) All molded capacitors should be

dressed so that flat side is perpendicular to chassis base.

(8) Yellow lead from cathode of 6J7 socket to term. 22 of S2 must be dressed under spaghetti on 6J7 socket jumper

and pulled tight away from chassis. The following bus leads should be kept as short as possible and, when necessary, replaced only with wire having same diameter as original: (9) Lead from L11,L12-L13 to ground lance; (10) Lead from term. 13 of S3 to ground lance; (11) Lead from term. 9 of S3 to L6 -L7; (12) Lead from L6 to C8; (13) Lead from C9 to C8; (14) Lead from term. 5 of Si to ground lance; (15) Lead from L11.2 to term. 4 of Si; (16) Lead from L1 to Cl; (17) Lead from term. 21 of S2 to C19. (18) Keep filament leads dressed away from grid prongs of 6N7. (19) Keep blue and green leads from plate prongs of output tubes twisted their entire length.

REPLACEMENT PARTS enuine factory tested parts, which are readily identified and may be purchased from authorized dealers.

STOCK No.

DESCRIPTION SOCK

o. DESCRIPTION

RECEIVER ASSEMBLIES 11172 Resistor ---470,000 Ohms, Carbon type, } watt (R11) 11397 Resistor -580,000 Ohms, Carbon type, 1/10 watt (Rl,

12038 Band -Rubber band for tuning tube R3) 14354 Belt -Variable condenser drive belt 12013 Resistor -1 Megohm, Carbon type, 1/10 watt (R23) 14517 Board -Antenna and ground terminal board 13730 Resistor -1 Megohm, Carbon type, j watt (R13) 12717 Board -Phonograph terminal board 11626 Resistor -2.2 Megohm, Carbon type, } watt (R7, RS) 14338 Bushing -Variable condenser mounting bushing assembly 11668 Resistor -5.8 Megohm, Carbon type, } watt (R26) 14524 Cable -Band indicator cable approx. 8} in. long 14532 Resistor -Voltage divider comprising one 1500 Ohm, one 14123 Cable -Tone control indicator cable approx. 3 in. long 2600 Ohm, one 3900 Ohm, one 27 Ohm and one 165 14394 Cable -Tuning tube cable and socket Ohm sections (R20, R21, R22 R24, R25) 11350 Cap -Grid contact cap 14343 Retainer -Station selector knob shaft and pulley retainer 12607 Cap -First I.F. transformer shield top 14350 Screw -No. 8-32 x 3/18 square head set screw for drum 12581 Cap -Second I.F. transformer shield top Stock No. 14345 gear Stock No. 30085 and hub and 12884 Capacitor -Adjustable trimmer (long) (C2, C23, C26) arm on band indicator cable 12724 Capacitor -Adjustable trimmer (Medium) (C9, C20) 14374 Shield -Antenna or R.F. coil shield 14021 Capacitor -22 Mmfd. (C25) 12008 Shield -First or Second I.F. transformer shield 13545 Capacitor -39 Mmfd. (C7) 14375 Shield -Oscillator coil shield 12720 Capacitor -100 Mmfd. (C11) 14114 Socket -Dial lamp socket 14262 Capacitor -110 Mmfd. (C12, C13) 11195 Socket -6 contact 5T4 Radiotron socket 12404 Capacitor -120 Mmfd. (C27, C28) 11196 Socket -8 contact 13F8, 6H6, 6K7, 6L7, 6N7, or 8J7 12724 Capacitor -120 Mmfd. (C18) Radiotron socket 12406 Capacitor -180 Mmfd. (C29) 12907 Spring -Tension spring for indicator drum gear Stock 12952 Capacitor -330 Mmfd. (C3, C10, C33) No. 30085 12727 Capacitor -656 Mmfd. (C24) 14342 Spring -Tension spring for idler Stock No. 14341 12537 Capacitor -560 Minfd. (C5) 12007 Spring -Retaining spring for core Stock No. 12006 and

13762 Capacitor -1500 Mmfd. (C16) No. 12800 12729 Capacitor -1550 Mmfd. (C22) 14371 Switch -Low frequency tone and power switch (S4, S5) 12728 Capacitor -4600 Mmfd. (C21) 14515 Switch -Range switch (SI, S2, S3) 12897 Capacitor --'4700 Mmfd. (CS) 14378 Transformer -First I.F. transformer (L14, L15, C12, 4838 Capacitor -.00S Mfd. (C39, C40) CIS)

13138 Capacitor -.01 Mfd. (C31, C36, C38) 14283 Transformer -Second I,F. transformer (L16, L17, C27, 4937 Capacitor -.01 Mfd. (C38) C28, C29, R5, RS)

11315 Capacitor -.016 Mfd. (C32) 11211 Transformer -Power transformer 105-125 volts, 50-60 4870 Capacitor -.025 Mfd (C30, C34) cycle (T1) 4839 Capacitor -0.1 Mfd. (C4, C17) 11212 Transformer -Power transformer 106-125 volts, 25-60

12484 Capacitor -0.25 Mfd. (C15) cycle (T1) 12741 Capacitor -0.5 Mfd. (C14, C37) 11213 Transformer -Power transformer 105-125/140-160/200- 521.2 Capacitor -18 Mfd. (C41) 250 volts, 50-60 cycle (T1)

14531 Capacitor -25 Mfd. (C42) 14335 Volume Control -(R9) 14372 Coil -Antenna coil and shield (L1, L2, L3, L4) 14379 Washer -Felt washer for indicator pointer 1451.8 Coil -Oscillator coil and shield (L11, L12, L13) REPRODUCER ASSEMBLIES 14414 Coil-R.F. coil and shield (L5, L8, L7, L8, L9, L10) MODEL 810T (RL -83-F2) 14513 Condenser -3 gang variable tuning condenser (C1, C8, 14356 Board -3 contact reproducer terminal board

C19) 13888 Cap -Cone center dust cap 5040 Connector -4 contact female connector for reproducer 11234 Coil -Field coil (L20)

cable 11469 Coil -Hum neutralizing coil (L-19) Cone dust (L18) 12006 Core -Adjustable core and stud for transformer Stock 12642 -Reproducer cone and cap Plug -4 contact male plug for reproducer No. 14378 and Stock No. 14283 5039

12800 Core -Adjustable core and stud for coil Stock No. 14518 14533 Reproducer -Reproducer complete 14518 Dial -Station selector dial scale complete with tuning

tube escutcheon 14358 Screw -Screw, washer, and lockwasher to hold core in

yoke 14514 Drive -Variable condenser vernier drive pinion gear and 14534 Transformer -Output transformer (T2)

shaft 14357 Washer -Spring washer to hold field coil 14345 Drum -Variable condenser drive belt drum complete with

net screws REPRODUCER ASSEMBLIES

MODELS 810K and 810K1 (RL -70,-E2) 14387 Escutcheon -Tuning tube escutcheon 13888 Cap -Dust cap for cone center 11982 Fastener -Dial scale fastener 11234 Coil -Field coil (L20) 30085 Gear -Indicator drive gear and hub, and pointer stein 11489 Coil -Hum neutralizing coil (L19)

and gear 12687 Cone -Reproducer cone and dust cap (L18) 14341 Idler -Station belt idler 5039 Plug -4 contact male plug for reproducer 14519 Indicator-Stationselector selector indicatorry pointer 14535 Reproducer -Reproducer complete 14520 Indicator -Vernier indicator pointer 14358 Screw -Screw, washer and lockwasher to hold core in

5228 Lamp -Dial lamp yoke 14028 Nut -Jamb nut for adjustable trimmer capacitor Stock 14534 Transformer -Output transformer (T2)

No. 12714 and No. 12884 14357 Washer -Spring washer to hold field coil 12471 Plate -6J7 Radiotron socket mounting plate and rubber

cushions -less socket MISCELLANEOUS ASSEMBLIES 14340 Pulley -Station selector drive belt pulley and knob shaft 14527 Escutcheon -Station selector escutcheon and crystal corn - 14522 Reflector -Dial reflector and bracket complete with dial plete with tone and band indicating strips

lamp bracket, tuning tube bracket and tone and band indicators

14528 Index -Tone control indicating strip --mounts in station selector escutcheon

14720 Resistor -1000 Ohms, Carbon type, j watt (R2) 14529 Index -Band indicating strip -mounts in station selector 14078 Resistor -18,000 Ohms, Carbon type, 1 watt (R27) escutcheon 14284 Resistor -22,000 Ohms, Carbon type, 1/10 watt (R5) 14359 Knob -Station selector knob 11300 Resistor -33,000 Ohma, Carbon type, 1/10 watt (R19) 14289 Knob -Volume control, tone control or range switch 13735 Resistor -33,000 Ohms, Carbon type, } watt (R4, R10) knob 11322 Resistor -39,000 Ohms, Carbon type, } watt (R12) 11210 Screw -Chassis mounting screw and washer assembly 5145 Resistor -100,000 Ohms, Carbon type, } watt (R14), for console model

R16, R18) 11377 Screw -Chassis mounting screw and washer assembly for 11398 Resistor -220,000 Ohms, Carbon type, 1/10 watt (R8) the table model 11453 Resistor -270,000 Ohms, Carbon type, 1/10 watt 4982 Spring -Retaining spring for knob Stock No. 14359

(R16, R17) 14270 Spring -Retaining spring for knob Stock No. 14289



180 RCA MODEL 810T4 Parts List

KADIOTRON COMPLEMENT

RCA MFG. CO., INC.

(1) RCA -6K7 R -F Amplifier ( 6) RCA -6N7 Phase Inverter A -F Amplifier (2) RCA -6J7 Heterodyne Oscillator ( 7) RCA -6F6 - - Power Output (3) RCA -6L7 First Detector ( e) RCA -6F6 Power Output (4) RCA -6K7 Intermediate Amplifier ( 9) RCA -6G5 "Magic Eye" Tuning Tube (5) RCA -6H6 Second Detector and A.V.C. (10) RCA-5U4G Full -Wave Rectifier

REPLACEMENT PARTS Insist on genuine factory tested parts, which are readily identified and may be purchased from authorized dealers.

S No K DESCRIPTION STOCK No. DESCRIPTION

RECEIVER ASSEMBLIES 14720 Resistor -1,000 ohms, carbon type, } watt (R2) 12038 Band -Rubber band for tuning tube 14078 Resistor -18,000 ohms, carbon type, 1 watt (R29) 14384 Belt-Vanable condenser drive belt 14284 Resistor -22,000 ohms, carbon type, 1/10 watt (R5) 14517 Board -Antenna and ground terminal board 11300 Resistor -33,000 ohms, carbon type, 1/10 watt (R19) 12717 Board -Phonograph terminal board 13735 Resistor -33,000 ohms, carbon type, } watt (R4, R10) 14338 Bushing -Variable condenser mounting bushing assembly 11646 Resistor -47,000 ohms, carbon type, } watt (R12) 14524 Cable -Band indicator cable, approximately 6¡ inches long 12333 Resistor -68,000 ohms, carbon type, }watt (R6) 14523 Cable -Tone control indicator cable, appiox,mately 3 8064 Resistor -82,000 ohms, carbon type, }watt (R27)

inches long 11281 Resistor -100,000 ohms, carbon type, 1/10 watt (R18) 14394 Cable -'-Tuning tube cable and socket 5145 Resistor -100,000 ohms, carbon type, } watt (R14, R15) 11350 Cap -Grid contact cap 5027 Resistor -150,000 ohms, carbon type, } watt (R28) 12607 Cap -First 1-F transformer shield top 11453 Resistor -270,000 ohms, carbon type, 1/10 watt (R16, 12581 Cap -Second I -F transformer shield top R17) 12884 Capacitor -Adjustable trimmer (long) (C2, C9, C23, 11172 Resistor -470,000 ohms, carbon type, }watt (R11)

C26, C46, C54, C56) 11397 Resistor -560,000 ohms, carbon type, 1/10 watt (R1, R3) 12714 Capacitor -Adjustable trimmer (medium) (C55) 12013 Resistor -1 megohm, carbon type, 1/10 watt (R23) 12896 Capacitor -15 Mmfd. (C25) 13730 Resistor -1 megohm, carbon type, } watt (R13) 13545 Capacitor -39 Mmfd. (C48) 11626 Resistor -2.2 megohms, carbon type, * watt (R7, R8) 12723 Capac.tor-56 Mmfd. (C47) 14532 Resistor -Voltage divider - comprising one 1,500 ohm, 30233 Capacitor -68 Mmfd. (C44) one 2,500 ohm, one 3,900 ohm, one 27 ohm, and one 12720 Capacitor -100 Mmfd. (CU) 165 ohm sections (R20, R21, R22, R24, R25) 14262 Capacitor -110 Mmfd. (C12, C13) 14343 Retainer -Station selector knob shaft and pulley retainer 12404 Capacitor -120 Mmfd. (C27, C28) 14350 Screw -No. 8-32 x 3/16 square -head set -screw for drum, 12724 Capacitor -120 Mmfd. (C18) Stock No. 14345, gear, Stock No. 30085, and hub and 12406 Capacitor -180 Mmfd. (C29) arm on band indicator cable 30232 Capacitor -200 Mmfd. (C45) 12799 Shield -Antenna or R -F coil shield 14546 Capacitor -220 Mmfd. (C5) 12008 Shield -First or second I -F transformer shield 12952 Capacitor -330 Mmfd. (C3, C10, C33) 14375 Shield -Oscillator coil shield for Stock No. 14516 30231 Capacitor -510 Mmfd. (C24) 12883 Shield -Oscillator coil shield for Stock No. 12881 13762 Capacitor -1,500 Mmfd. (C16) 14114 Socket -Dial lamp socket 12729 Capacitor -1,550 Mmfd. (C22) 11195 Socket -5 -contact 5U4G Radiotron socket 12728 Capacitor -4,500 Mmfd. (C21) 11196 Socket -8 -contact 6F6, 6H6, 6K7, 6L7, 6J7, or 6N7 12897 Capacitor -4,700 Mmfd. (C6) Radiotron socket

4838 Capacitor -.005 Mfd. (C39, C40, C52, C53) 12907 Spring -Tension spring for indicator drum gear, Stock 13138 Capacitor -.01 Mfd. (C31, C35, C36, C50) No. 30085 11315 Capacitor -.015 Mfd. (C32) 14342 Spring -Tension spring for idler, Stock No. 14341

4870 Capacitor -.025 Mfd. (C30, C34) 12007 Spring -Retaining spring for core, Stock Nos. 12006 and 4839 Capacitor -0.1 Mfd. (C4, C17, C49) 12800

12484 Capacitor -0.25 Mfd. (C15) 30084 Switch -High -frequency tone and power switch (S4, S5) 12741 Capacitor -0.5 Mfd. (C37, C51) 30226 Switch -Range switch (S1, S2, 83)

5212 Capacitor -16 Mfd. (C41) 12654 Trap -Wave trap (L24) 14531 Capacitor -25 Mfd. (C42) 14376 Transformer -First I -F transformer (L14, L15, C12, 30228 Coil -Antenna coil and shield -A, B, C, and X bands C13)

(L1, L2, L3, L4, L21) 14308 Transformer -Second I -F transformer (L16, L17, C27, 14516 Coil -Oscillator coil and shield -A, B, and C bands C28, C29, R5)

(L11, L12, L13) 11212 Transformer -Power transformer, 105-125 volts, 25-60 12881 Coil -Oscillator coil and shield -X band only (L23) cycles (T1) 30229 Coil -R -F coil and shield -A, B, C, and X bands (L5,

L6, L7, L8, L9, L10, L22) 11213 Transformer -Power transformer, 105-250 volts, 50-60

cycles CT1) 14513 Condenser -3 -gang variable tuning condenser (C1, C8, 14335 Volume Control (R9)

C19) 14379 Washer -Felt washer for indicator pointer 5040 Connector -4 -contact female connector for reproducer

cable REPRODUCER ASSEMBLIES (RL -83F-2) 30567 Connector -4 -contact female connector with metal shell 14356 Board -3 -contact reproducer terminal board

for reproducer cable in later production 13866 Cap -Cone center dust cap 12008 Core -Adjustable core and stud for transformer, Stock 11234 Coil -Field coil (L20)

Nos. 14376 and 14308 11469 Coil -Hum neutralizing coil (L19) 12800 Core -Adjustable core and stud for coil, Stock No. 14516 12642 Cone -Reproducer cone and dust cap (L18) 30230 Dial -Station selector dial scale, complete with tuning 5039 Plug -4 -contact male plug for reproducer

tube escutcheon 14533 Reproducer, complete 14514 Drive -Variable condenser vernier drive pinion gear and

shaft 14358 Screw -Screw, washer, and lockwasher to hold core in

yoke 14345 Drum -Variable condenser drive belt drum, complete with 14534 Transformer -Output transformer (T2)

set screws 14357 Washer -Spring washer to hold field coil 14387 Escutcheon -Tuning tube escutcheon 11982 Fastener -Dial scale fastener MISCELLANEOUS ASSEMBLIES 30085 Gear -Indicator drive gear and hub, and pointer stem and

gear 5040 Connector -4 -contact female connector for reproducer in -

terconnecting cable in later production 14341 Idler -Station selector drive belt idler 30568 Connector -4 -contact male connector for reproducer inter - 14519 Indicator -Station selector indicator pointer connecting cable in later production 14382 Indicator --Vernier indicator pointer 30234 Escutcheon -Station selector escutcheon and crystal, corn -

5226 Lamp -Dial lamp plete with tone and band indicating strips 14028 Nut -Jamb nut for adjustable trimmer capacitor, Stock

Nos. 12714 and 12884 14611 Index -Tone control indicating strip -mounts in station

selector escutcheon 12471 Plate -6J7 Radiotron socket mounting plate and rubber

cushions -less socket 30235 Index -Band indicating strip -mounts in atatton selector

escutcheon 14340 Pulley -Station selector drive belt pulley and knob shaft 14359 Knob -Station selector knob 30227 Reflector -Dial reflector and bracket, complete with dial 14269 Knob -Volume control, tone control, or range switch knob

lamp bracket, tuning tube bracket and tone and band 11377 Screw -Chassis mounting screw and washer assembly indicators 4982 Spring -Retaining spring for knob, Stock No. 14359

13250 Resistor -330 ohms, carbon type, } watt (R26) 14270 Spring -Retaining spring for knob, Stock No. 14289

Height 20/4 inches Weight (shipping) 43 pounds Width 17% inches Chassis Base ,Dimensions.147/8 inches x e4 inches x 3% inches Depth 111:M6 inches

Weight (net)... _... 33 pounds Over-all Chassis Height 9 4 inches



RCA PAGE 9-111

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TAGE 9-182 RCA 1I DEL 810T4 Chassis Wiring Coils

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RCA PAGE 9183

RCA MFG. CO., INC.

General This receiver employs a ten -tube, four -band, "Magic Brain,"

superheterodyne circuit, the arrangement of which is shown by the Schematic Circuit Diagram. Features of design include an r -f amplifier stage; "qumulative-wound" "A" antenna and r -f transformers for high signal-to-noise ratio; magnetite -core, i -f transformers and low -frequency "X" and "A" oscillator tracking; automatic volume control; phonograph terminal board; "Magic Eye" tuning tube; plunger -

Servi The various diagrams of this booklet contain such infor-

mation as will be needed to isolate causes for defective operation if such develops; The ratings of the resistors, capacitors, coils, etc., are indicated adjacent to the symbols signifying these parts on the diagrams. Identification titles such as RI, L1, Cl, etc., provide reference between the illustrations and Replacement Parts List. The coils, transformer windings, and reactors are rated in terms of d -c resistance to permit continuity checks.

Loudspeaker. ---Centering of the loudspeaker is made in the usual manner with three narrow celluloid or paper feelers after first removing the front dust cover. This may be removed by softening its cement with a light application of acetone, using care not to allow the acetone to flow into the air gap. The dust cover should be cemented back in place with ambroid upon completion of adjustment.

Precautionary Lead Dress. -(1) Twist yellow, blue, and green leads from oscillator coil to S2. (2) Dress C45 and C21 away from C55. (3) Dress black lead from. S2 to ground lance away from C55. (4) Dress yellow lead from 6J7 socket to S2 under bus on 6J7 socket. (5) Make lead from S3 to ground 21/2 inches long and dress away from chassis. (6) Twist filament leads. (7) Dress shielded lead from C31 to phono. term. board away from 6L7 socket. (8) Dress yellow lead from term. "K" of 6J7 to CI1 away from chassis and from brown filament lead. (9) Dress all molded capacitors perpendicular to chassis. (10) Dress fila -

Measured at

MODEL 810T4 Lead Dress,Voltage Notes,Trir>xer s

Description type, air -dielectric trimming capacitors; aural -compensated, audio -volume control; "Bass -Mellow -Brilliant" tone control; audio phase -inverter voltage amplifier; push-pull, power -

output stage; improved dust -proof electrodynamic loudspeaker; -a new sunburst dial with short-wave stations listed by name and illuminated band and tone indicators; and the improved "Magic Voice."

ce Data Phonograph Attachment. -A terminal board is provided

for connecting a phonograph into the audio amplifying circuit. RCA Victor Models R-93, R93 -A, R-93-2, or R-94 Record Players should be connected as follows: Remove link between terminals 1 and 2 on terminal board. Connect green wire in Radio -Record switch cable to terminal 1, yellow to terminal 2, and shield extension to terminal 3. Tape unused red and blue leads separately. Connect a 2 -conductor twisted cable between the Record Player binding posts and the screw terminals on Radio -Record switch. If additional volume is desired, connect an RCA Stock No. 9632 transformer between the two conductor twisted cable and the screw - terminals on Radio -Record switch as follows: yellow and brown transformer leads and one side of twisted cable to ground screw -terminal on switch; black transformer lead to other side of twisted cable; and blue transformer lead to other screw -terminal on switch.

ment leads away from terms. "Gl" and "G2" of 6N7. (11) Twist blue leads from terms. "P" of 6F6's. Make the following as short as possible: (12) Lead from oscillator coils to ground. (13) Lead from S2 to C19. (14) Lead from detector coil to S3. (15) Lead from detector coil to C8. (16) Lead from S 1 to chassis ground lance. (17) Lead from antenna coil, to S1. (18) Lead from antenna coil to Cl. (19) Yellow lead from 2nd i -f transformer to phono. term. board. When necessary to replace bus leads, use only wire having same diameter as original.

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115 volts, 60 -cycle supply -Tuned to approximately 1,000 kc or 300 meters, "A" band ("Medium Wave") - No signal being received -Volume control minimum

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Note: Two voltage values are shown for some readings. The value shown in parentheses with asterisk (0) indicates operating conditions without voltmeter loading. The other value (generally lower) is the actual measured

voltage and differs from the value shown in parentheses because of the additional loading of the voltmeter through the high series circuit resistance.

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Voltage values as specified should hold within ±20`'/0 when the receiver is normally operative at its rated line voltage. To duplicate the conditions under which the voltages were measured requires a 1,000.-ohmper-volt d -c

meter, having ranges of 10, 50, 250 and 500 volts. Use the nearest range above the specified measured voltage. Ac voltages were measured with a corresponding a -c meter.

I-(ThJohn F. Rider, Publisher

184 RCA MODEL 810T4 Alignment RCA MFG.

Alignment Calibrate the tuning dial by adjusting main dial pointer

to the low -frequency (end) calibration mark on dial with the gang tuning -condenser plates in full -mesh position; then adjust the small (vernier) pointer to "O." These are friction adjustments.


Cathode-ray alignment is highly preferable; the connections to the chassis are shown on figure 4. If an output indicator is used, connect it across the loudspeaker voice -coil and advance the receiver volume control to full -volume position.

Connect the "low" output terminal of the test oscillator to the receiver "G" (ground) terminal for all alignment operations. Regulate the output of the test oscillator so that minimum signal is applied to the rec to obtain an observable output indication. This will avo. a-v-c action.

CO., INC.

Procedure The term "Dummy antenna" means the device which must

be connected between the "high" test -oscillator output and the point of connection to the receiver in order to obtain ideal alignment. "No signal, 545-400 meters" means that the receiver should be tuned to a point between 545 and 400 meters where no signal or interference is received from a station or local (heterodyne) oscillator. In extreme noisy locations, one end of C10 (top of gang) should be unsoldered during i -f alignment.

Conversion of kilocycles (kc) to meters for alignment frequencies is as follows: 20,000 kc (20 mc) = 15 meters; 6,000 kc (6 mc) = 50 meters; 1,500 kc = 200 meters; 600 kc = 500 meters; 460 kc = 652 meters; 353 kc = 850 meters; and 166.7 kc = 1,800 meters.




Selector Receiver

Dial Setting Circuit to

Adjust Adjustment

Symbols Adjust to

Obtain Connection to Receiver

Dummy Antenna

Frequency Setting

1 6K7 I -F Grid Cap .001 Mfd. 460 kc "Medium

Wave" No Signal

545-400 meters

2nd I -F Trans. L16 and L17 Max (peak)

2 6L7 Det. Grid Cap.001 Mfd. 460 kc "Medium,

Wave" ' No Signal

545-400 meters


3 Ant. Term. 200 Mmfd. 460 kc "Medium Wave"

No signal 545-400 meters

Wave Trap L24 Minimum Output

4 Ant. Term. 300 Ohms 20,000 kc "Short Wave 2" 20 me "C" Osc. C55 Max. (peak)*

5 Ant. Term. 300 Ohms 20,000 kc "Short Wave 2" 20 mc "C" Det. C9 Max. (peak) j'

6 Ant. Term. 300 Ohms 20,000 kc "Short Wave 2" 20 mc "C" Ant. C2 Max. (peak)$

7 Ant. Term. 300 Ohms 6,000 kc "Short Wave 1" 6 mc "B" Osc. C23 Max. (peak)*

8 Ant. Term. 200 Mmfd. 600 kc "Medium Wave" 500 meters "A" L -F Osc. L13 Max. (peak)

9 Ant. Term. 200 Mmfd. 1,500 kc "Medium Wave" 200 meters "A" H -F Ose. C26 Max. (peak)

10 Ant. Term. 200 Mmfd. 600 kc "Medium Wave" 500 meters "A" L -F Osc. L13 Max. (peak)

11 Ant. Term. 200 Mmfd. 1,500 kc "Medium Wave" 200 meters "A" H -F Ose. C26 Max. (peak)

12 Ant. Term. 200 Mmfd. 166.7 kc "Long 1,800 meters "X" L -F Osc. L23 Max. (peak)

Ant. Term. 200 Mmfd. 353 kc "Lone Wave 850 meters "X" H -F Osc. C46 Max. (peak)

14 Ant. Term. 200 Mmfd. 353 kc Wav g 850 meters "X" Det. CM Max. (peak)

15 Ant. Term. 200 Mmfd. 353 kc Wave 850 meters "X" Ant. C56 Max. (peak)

16 Ant. Term. 200 Mmfd. 166.7 kc g Wave" 1,800 meters "X" L -F Ose. L23 Max. (peak)

17 Ant. Term. 200 Mmfd. 353 kc Wave" 850 meters "X" H -F Osc. C46 Max. (peak)

* Use minimum capacity peak if two peaks can be obtained. t Use m>< ximum capacity peak if two peaks can be obtained. $ After this adjustment, check for image signal by shifting receiver dial to 19,080 mc.

RCA PAGE 9-185

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RCA PAGE 9-187

RCA MFG. CO., INC. MODEL 813K Voltage,Tr imr.ler s Socket,Data

Thirteen -Tube, Five -Band, A -C, Superheterodyne Receiver

General Description

This receiver employs a thirteen -tube, five -band, "Magic Brain" superheterodyne circuit. Features of design include "Electric Tuning" with push-button operation; automatic frequency control; spread -band, "Overseas" dial; "qumulative- wound" antenna and detector "A" band coils; tuned r -f amplifier; magnetite -core adjusted i -f transformers and low - frequency "A" oscillator tracking; two -stage i -f amplifier; phonograph terminal board; "Magic Eye" tuning tube; twelve -inch electrodynamic loudspeaker; plunger -type, air - dielectric trimming capacitors; temperature -stabilized capacitors; two -point aural -compensated volume control; "Fidelity" control; "Music -Speech" control; and a driven push-pull power -output stage. In addition, this model has a cabinet incorporating the "Sonic Arc" Magic Voice.

Radiotron Cathode Current Readings Measured with Milliammeter Connected at Tube Socket

Cathode Terminals Under Conditions Similar to Those of Voltage Measurements

( 1) RCA -6K7 -R -F Amp. 9.0 ma. ( 2) RCA -6L7 -1st Det. 3.5 ma. ( 3) RCA-6J7-Osc. 8.5 ma. ( 4) RCA-6J7-Osc. Control 1.8 ma. ( 5) RCA-6K7--lst I -F Amp. 9.0 ma. ( 6) RCA -6K7 -2nd I -F Amp. 8.0 ma. ( 7) RCA -6H6 -2nd Det. ( 8) RCA -6C5 -A -F Amp. 0.9 ma. ( 9) RCA -6F6 -Driver 22 ma. (10) RCA -6F6 -Output 25 ma. (11) RCA -6F6 --Output 25 ma. (12) RCA -6G5 -Tuning Tube 3.0 ma. (13) RCA -5T4 -Rectifier 128 ma.**

(**Cannot be measured at socket)

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Figure 6-Radiotron Socket Voltages, Coil, and Trimmer Locations Measurad at 115 volts, 60 -cycle supply -Tuned to approximately 1,000 kc ("Standard Broadcast") -"Manual" control -

No signal being received -Volume control minimum -Fidelity control optional Note: Two voltage values are shown for some read- Voltage values as specified should hold within ±20%

ings. The value shown in parentheses with asterisk (') when the receiver is normally operative at its rated line indicateg operating conditions without voltmeter loading. voltage. To duplicate the conditions under which the The other value (generally lower) is the actual measured

voltages were measured requires a 1,000 -ohm -per -volt d -c meter, having ranges of 10, 50, 250 and 500 volts. Use voltage and differs from the value shown in parentheses the nearest range above the specified measured voltage. A -c because of the additional loading of the voltmeter. voltages were measured with a corresponding a -c meter.

188 RCA ADEL 813K Socket,Trimmers Tuner Wiring

RCA MFG. CO., INC.

REAR APRON OF CHASSIS

OUTPUT

G A

OUTPUT L1

TI

BLUE

RECT.

COMP PACK

BLU E

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LI6-OSC. 25 METER 11,700 K.C.

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BLACK RED -

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C10-OSC. C15-OSC. 149 METER ¡"A"BAND 6100 K.C. ; 1500K.C:

REMOTE ONNECTION

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GIB;

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CONTROL

STATION SELECTOR DISCS

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LLO BLACK

BLACK. REOTR.

TUNING MOTOR

T4

BOTTOM TERM.

AUDIO AMPLIFICATION AND A.F.C. SUPPRESSION

SWITCHES

TOP VIEW- FRONT OF CHASSIS BROWN BLUE -

I TUNING (I' TUBE

6G5

CIO

UC20 C2O-DET 31 METER

9,600 K.C.

C3 -ANT 31 METER

9,600 K.C.

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GREEN STATION SELECTOR SPEECH MANUAL PUSH BUTTONS STATION SELECTOR

PUSH BUTTONS

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49 METER YELLOW,

AUDIO DRIVER

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HOLE

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7 L

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SEC. ADJ. L21 460 K.0

SEC.ADJ. L24 460 K. C

SEC. ADJ. L 27 460 K.C.

ISEC. ADJ. 6> r LOB

46014.0

DRIVE --+.'{1 E . TOA.F.C. DIODE CATHODE

GEAR TRAIN11 - TO AUDIO GRID ENGAGING CIL, £O, t PIN EÌ LL T MOTOR SHAFT

RED -YELLOW GREEN -YELLOW BLUE -YELLOW REO -GREEN RED

gGREEN BLUE BROWN

MOTOR ARMATURE. MOVES FORWARD AND CLOSES THESE CONTACTS WHEN RUNNING.

BLACK -RED TR.

YELLOW

DIAL LAMPS

© RCA MFG.CO., INC SN -759

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BLAC K

REACTIVE WINDING BROWN -BLACK

ARMATURE

TUNING MOTOR

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SWITCH

RCA MFG.CO.,I NC. P-84130-0

REVERSING SWITCH OPERATED --- BY LEVER NEAR ENDS OF TUNING CONDENSER TRAVEL.

BLACK

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TOP VIEW -REAR OF CHASSIS

©John P. Rider, Publisher www.americanradiohistory.com

RCA PAGE. 9-189

RCA MFG. CO., INC. Calibrate the tuning dial by adjusting dial dia1 pointer to the

left ends of horizontal calibration lines with the gang tuning - condenser plates in full -mesh position. This is a screw -driver adjustment.

The "Fidelity" control should be turned counter -clockwise during all alignment operations. The -Manual-Electric- Remote- switch should be turned to "Manual" (clockwise) during alignment unless otherwise specified. The bottom shield -pan must be in place during spread -band alignment. Permit the set to operate at least five minutes before attempting alignment.

CAUTION.-The magnetite core screw L29 on the bottom of the 4th i -f transformer has been accurately adjusted, for an exact electrical balance of coil L29 to center tap, during manufacture and should not be disturbed. However, if for any reason the adjustment has been moved from its original position, it will be necessary to mechanically adjust this screw until the end of the stud protrudes exactly % of an inch (four threads exposed) above the brass bushing prior to any alignment operations.

Perform alignment in proper order, tabulated below, starting with No. 1 and following all operations across, then No. 2, etc. A -f -c disriminator adjustments should follow r -f and i -f adjustments tabulated below. Adjustment locations

MODEL 813K Alignment

are shown on figures 3 and 6. Cathode-ray alignment is preferable for adjustments 2, 3,

and 4 due to the flat -top i -f characteristics; the connections to the chassis are shown on figure 2. If an output indicator is used, connect it across the loudspeaker voice -coil and advance the receiver volume control to full -volume position. The Magic Eye may be used as an output indicator for all other adjustments. It is preferable to replace the 605 tuning tube with a 6E5 during alignment.

Connect the "low" output terminal of the test oscillator to the receiver chassis for all alignment operations. Regulate the output of the test oscillator so that minimum signal is applied to the receiver to obtain an observable output indication. This will avoid a -v -c action and reduce possibility of error in spread -band adjustments.

The term "Dummy antenna" means the device which must be connected between the "high" test -oscillator output and the point of connection to the receiver in order to obtain ideal alignment. "No signal, 550-750 kc" means that the receiver should be tuned to a point between 550 and 750 kc where no signal or interference is received from a station or local (heterodyne) oscillator. "Min. Eye" means minimum width of dark sector of Magic Eye.


Order of Alignment


Selector Receiver

Dial Setting Circuit to

Adjust Adjustment

Symbols Adjust to Obtain Connection


Frequency Setting

1 4th I -F Trans.L28 Turn Extreme

Counter- clockwise

2 No. 6, 6K7

2nd I -F Grid Cap



3rd I -F Trans. L26 and L27 Max. (peak)

3 No. 5, 6K7

lat I -F Grid Cap



2nd I -F Trans L23 and L24 Max. (peak)

4 No. 2, 6L7

Det. Grid Cap


No Signal 550-750,1(c


5 Ant. Term. 300 Ohms 1,800 kc ab "31M." 9.6 mc "31M." Osc. L17 Min. Eye

6 Ant. Term. 300 Ohms 1,600 kc a

"31M." 9.6 me "31M." Det. C20 Min. Eye

7 Ant. Term. 300 Ohms 1,600 kac "31M." 9.6 ntc "31M." Ant. C3 Min. Eye

8 Ant. Term. 300 Ohms 1,300 kc a "25m." 11.7 mc "2.5M." Osc. L16 Min. Eye

c

9 Ant. Term. 300 Ohms 1,700 ac "19M." 15.3 mc "19M." Osc. L15 Min. Eye d

10 Ant. Term. 300 Ohms 6,00 kc e

"49M." 6.0 mc "49M." Osc. C10 Min. Eye f

11 Ant. Term. 300 Ohms 6,100 kec 49M.., 6.1 mc "49M." Osc. C10 Min. Eye

12 Ant. Term. 200 Mmfd. 600 kc "Standard Broadcast" 600 kc "A" L -F Osc. L35 Min. Eye Y

13 Ant. Term. 200 Mmfd. 1,500 kc "Standardoct1,500 Broadcast" kc "A" H -F Osc. C15 Min Eye Y

14 Ant. Term. 200 Mmfd. 600 kc "Standard Broadcast" 600 kc "A" L -F Osc. L35 Min. Eye

15 Ant. Term. 200 Mmfd. 1,500 kc "Standard Broadcast" 1,500 kc "A" H -F Osc. C15 Min. Eye

16 Proceed to A -F -C Discriminator Adjustments Outlined Below

a-Refer to "Spread -band Adjustments" below for Test Oscillator setting for adjustments 5, 6, 7, 8, and 9.

b-1 ise minimum inductance peak (plunger out) if two peaks can be obtained. To check for correct harmonic, carefully set Test Oscillator to 1,200 kc using Crystal Calibrator. Signal should be indicated by "Magic Eye" in "31M." band near 9.6 rrtc.

c-Use minimum inductance peak (plunger out) if two peaks can be obtained. To check for correct harmonic, carefully set Test Oscillator to 900 kc using Crystal Calibrator. Signal should be indicated by "Magic Eye" in "25M." band near 11.7 mc.

d-Use minimum inductance peak (plunger out) if two peaks can be obtained. To check for correct harmonic, carefully set Test Oscillator to 900 kc using Crystal Calibrator. Signal should be indicated by "Magic Eye" in "19M." band near 15.3 mc.


19 O RCA EDDEL 813K Circuit Data Adjustrents,Lead Dress

Spread -bend Adjustment .-Bottom shield -pan must be in

place before attempting . read-band alignment. Alignment of the spread ("Overseas") bands requires special procedure

since test oscillators used alone are not ordinarily sufficiently

accurate for this purpose. The RCA Stock No. 9572 Crystal

Calibrator affords a convenient and accurate alignment stand-

ard. Wrap a few turns of wire around the crystal alibrator and connect one free end to the antenna terminal of the

receiver. Using the crystal calibrator to obtain the necessary

accuracy, follow the tabulated alignment procedure for the.

"31M.', "25M.", and "19M." bands. The "31M." band alignment, for example, is done as

follows: Tune the receiver ("Standard broadcast" band) to

the 1,000 kc crystal calibrator output with the crystal tali- brator "Hi -Lo" switch in "Hi" position. Snap "Hi -Le" switch

to "Lo" and carefully tune receiver to 1,600 kc (the sixth

100 kc harmonic above 1,000 ht) for minimum "Magic Eye" opening (Min. Eye). Move crystal calibrator away from an,

tenna wire, connect test oscillator, and carefully adjust test

oscillator for minimum "Magic Eye" opening at a netting

of approximately 1,600 kc. (If Stock No. 150 Test Oscillator is used, refer to second paragraph below.) Raise test -oscillator output to give sufficient harmonic output and use 6th harmonic (9,600 kc) for aligning in "31M." band at 9.6

mc. Align in the "25M." band at 11.7 mc (11,700 kc), the

9th harmonic of the testosallator 1,300 kc output. Align in the "19M." band at 15.3 mc (15,300 kc), the 9th harmonic of the teat -oscillator 1,700 kc output. In each case

select the peak giving minimum "Magic Eye" opening. For the "49M." band, snap crystal calibrator "lino':

switch to "Hi", turn the range selector to "49M." band, and

set receiver dial pointer to 6.0 mc. Adjust oscillator trimming n capacitor CIO for minimum "Magic Eye" opening. Use

peak indicated by the alignment table. Snap "HiLo" switch to "Lo" and locate 6,100 kc (the first 100 kc harmonic above 6,000 kc) by slightly readjusting CIO with the dial pointer set at 6.1 mc. This method insures nelection of correct crystal -calibrator harmonic.

When aligning with the RCA Stock No. 150 Teat Oscil lator use the variable (unmodulated) oscillator(' and "Magic Eye" indication of receiver output. Set test -oscillator dial 800 kc lower than the desired signal for the four lower ire quency ranges and 800 kc higher than the desired signal for the two high range. and use in ame manner as TMV97-C. Insert an open -circuit telephone plug in the test oscillator "Eat. Mod.' jack, no the modulated fiscal -frequency oscillator will be cat off, and align on the unmodulated variable oscil-

lator signal, which will clot. the "Magic Eye" and evidence

itself by a rushing noise in the speaker. If the crystal calibrator signals are weak, disconnect test

oscillator while using the crystal calibrator. More accurate alignment in the apreadbands can be

accomplished by making final slight adjustments using American, English, or German shortwave -b oadasting ate tions of known frequency for frequency standards.

A -F.0 Direiminator Adjistmenta-These adjustments are

rather critical and should be performed with extreme care.

Improper adjustment may result in complete failure of the oscillator control tube to function or else may cause it to detune the oscillator instead of tuning it to the signal. It is

assumed that the magnetite core adjusting screw L28 (top of 4th 1f transformer) has been turned all the way out (extreme counterclockwise) during the preceding tabulated adjoin - menu. Adjustments are a. follows: Remove spring "N' on

link and arm assembly which connects the "Manual -Electric. Remote" switch shaft to the throw -out" gear bracket. Turn "Fidelity" control counter -clockwise. Connect antenna to re ceiver antenna terminal. With the "Manual -Electric -Re, mote" switch in "Manual" (right) position, tune in a

strong local station near 600 kc or the low -frequency end of the "A" band as accurately as potable by meant of the tuning tube "Magic Eye." The most accurate adjustment will be obtained by adjusting the "vernier" tuning knob mid -way between the two points where the eye just appears to start to open. This will place the generated i -f carrier signal fee quency exactly in the center of the i -f amplifier response curve (should be 460 kc if i -f amplifier was properly aligned) and is the frequency to which the afc discriminator (4th if transformer) should be tuned to resonance. Without din torhing any of the receiver adjustments, place the "high" test -oscillator lead about 5h of an inch from the grid cap lead of the RCA -6K7, 1st i -f amplifier tobe, adjust the wt oscillator output to maximum, turn testosàllator "Module tion" off, and carefully zero -beat the test'oecillator frequency (approximately 460 kc) with the if carrier signal. Avoid placing the test -oscillator lead nearer to the grid -cap lead than specified above, as doing so will tend to detune the if amplifier. It may be necessary to reduce the local station signal, during this operation, by shortening antenna lead or grounding antenna "A" terminal to chassis in order to increase the loudness of the beat note sufficiently for accurate zero -beat adjustment.

Throw "Manual -Electric -Remote" switch to "Electric" (center) position. A high whistle or beat note will now be heard. Turn the magnetite core screw L28 (top of 4th s -f transformer) slowly clockwise. As this screw is turned, the beat note will first increase to a high audio frequency and will then decrease to a reeobeat and then increase in frequency again. The point of exact zero -beat is the position

t The No.in 110 Test Oscillator employsy axed-frequency

oscillato100 r. The heuscale

is oscillator

alibated to the frequencyunm for the two higher frequency anges and to the difference ere. quency for the four lower frequency rangea.

RCA MFG. CO., INC.

for correct adjustment of the diectiminator. Zero -beat should ceiver above and below the local station frequency with the

also still exist when the "Manual -Electric -Remote" switch is " anualElectricRemoti" io "Manual" position, switching

thrown back to "Manual" position. The adjustment is now to "Electric" position, and noting the oscillator pull -in. Re -

complete and may be checked by slightly detuning the re place spring "N."

Circuit Arrangement The circuit consists of an rd amplifier sage; firshdetector

(converter) sage; separate heterodyne -oscillator sage; oscil-

latorcontrol stage; two i -f amplifier stages; diode detector,

automatic -frequency and volume -control stage; audio voltage amplifier stage; audio -driver stage; push-pull powerampli er

sage: tuning indicator "Magic Eye"; and a full -wave

rectifier. The antenna and first -detector code are constructed with a

special type cif winding ("qumulative") to provide increased sensitivity and selectivity on the "Standard Broadcast" band. Special capacitors shunting the spread -band oscillator coils change in capacity with temperature variations to reduce oscillator frequency drift.

Spread -band tuning is accomplished electrically by shunting the low -capacity section of the oscillator variable capacitor with relatively large temperature -stabilized fixed capacitors for tuning the oscillator coil on the "19M," "25M," ' 31M," and "49M" bands. Antenna and first -detector coils are designed to be sufficiently broad -tuned to require no variable tuning over the narrow frequency range of the spread -bands.

The spread -band oscillator coils and the "Standard Broad- cast" band mediator, first -detector, and antenna cods arc all wound on separate forms. The antenna and first -detector spread -band coils are tapped. Undesirable interaction between coils is avoided by shorting proper unused sections by means of the range lector.

The intermediate frequency amplifier consists of two RCA - 6R7 tubes in a two -stage transformer -coupled circuit. The windings of all if transformers are resonated by fixed cape citors and are adjusted by molded magnetite cores to tune to 460 kc. A third winding, L22, in the first if transformer, closely coupled to the, primary, L20, is placed in series with the main secondary, L21, when the fidelity control switch SII is thrown to "broad" position (see figure 1), thereby incraa ing the coupling between the primary and secondary circuits with a consequent broadening of the band width of the id amplifier, permitting higher fidelity reception.

The function of the automatic -frequency -control circuit is to automatically change the frequency of the heterodyne oscillator so that the correct i -f frequency u formed for the ie amplifier. The circuit consists essentially of an if dui cnmmator which, as the name implies, discriminates or fur - rushes control voltage of the correct polarity to an oscillator frequency -control tube for generated 1.4 carrier frequencies slightly above and below 450 kc, or the frequency to which the le amplifier is tuned.

The plate circuit of the RCA -6j7 oscillator -control tube is

caused to act as an apparent variable inductance in' parallel with the "A" band oscillator tuned circuit of which coil L35 is a part. The settee combination of resistor R5 and the capacitor Cl6 is also in parallel with the oscillator tuned cit.-

cwt. Since the resistance of 145 is many times greater than the reactance of C16, at the oscillator frequency, the rf current through the combination will be pracnally in phase with the el voltage across the oscillator tuned circuit. However, the r -f volage impressed across the C16 capacitance section of the combination, or from grid to cathode, will lag the rf volage acros the combination, or the tuned circuit, approximately 90 degrees. The grid -cathode r -f voltage will be amplified by the control tube but will be shifted an addi- clonal 180 degrees (grid and plate voltages of all tubes are always opposite in phase) so that the amplified ef voltage appearing across the plate circuit will now lead the volage across the combination or the tuned circuit by 90 degrees, or, in other word., the control tube is acting as an equivalent shunt inductance. The amount of this action is determined by the amplification of the tube which, in turn, ù governed by the grid -cathode bias voltage. In operation, a residual bias is developed across the cathode resistor R6. The de control -

grid voltage u fed to the control grid from the discriminator circuit through resistor R7. If Shin voltage is negative with respect to ground, the amplification of the control tube will be decreased, the apparent plate -circuit inductance of the tube increased, which will lower the frequency of the oscillator tube. The converse will occur when the grid volage is positive with respect ect to ground.

The action of discriminator circuit depends upon the fact that a 90 -degree phase difference exists between the pri mary and secondary potentials of a double -tuned loosely - coupled transformer when the resonant frequency is applied, and that this phase difference varies as the applied frequency varies, i.e., the maximum resultant response voltage across

the primary and secondary winding. connected in series will occur at a frequency either lower or higher in frequency than the frequency to which the individual windings are resonated, respectively, depending on whether the windings are connected series aiding or opposing.

The discriminator, or fourth i'f transformer, consists of the primary winding, L30, which is a part of the third if transformer secondary tuned circuit (tuned to 460 kc) and the centereapped secondary, L29. The upper and lower halves of L29 may be considered as two secondary coils, the upper series aiding and the lower series opposing the primary, L30. The magnetite core in L29 in inserted to inductively balance the two halves. The function of coil 128 (magnetite core adjusted), in parallel with 129, is to tune the secondary to

460 kc. Therefore, the maximum volage will be applied to

diode circuit PtKt and R18 when the if signal frequency u below 460 he and to the diode circuit PºKa and RI7 when

the if signal frequency is above 460 kc. Resistors RI7 and

R18 are connected in series between ground and a point leading to the oscillator controltube grid.

Dc volages, resulting from diode rectification, across RI7

and R18 are always in opposition, consequently the oscillator

control -tube grid -bias voltage is a differential amount, de

pending upon the i -f signal strength and its frequency devu tion from the nominal value of 460 kc. The polarity of this

differential oscillator control tube grid -bias, with respect to

ground, depends on whether the if signal frequency is above or below 460 kc, but u always in the direction which vnll

bring the generated if frequency nearer to 460 kc. A.fc action is automatically eliminated for "manual" tuning by grounding diode cathode Ki through switch 59.

Service Data

The various diagrams of this booklet contain such infor mation as will be needed to isolate causes for defective opera, tion if such develops. The ratings of the resistors, capacitors,

coils, etc., arc indicated adjacent to the symbols signifying these part. on the diagrams. Identification titles such a Rl, LI, CI, etc., provide reference between the illusations and

Replacement Para List. The coils, transformer windings, and

reactors arc rated in terms of d -c resistance to permit con tinuity checks.

Precautionary Lead Davos.-(1) Green bun leads from CI ne

from nearIby

and Gro(2)C59 Green

S2 bu

¡Mould lead from C113 y to S3 should

be 2)inchee long and dressed away from nearby parts. (3) Bus leads from C12 to L18 and from L18 to 53 should be as

short as possible. (4) Red and blue leads from tube No. 3

to 19M. oscillator coil should be dressed away from coil.

(5) Tube No. 3 grid lead should be 6 -inches long and

dressed away from grounded metal parta. (6) All leads

behind oscillator coils should be dressed close to chassis. (7) "Magic Eye" cable should be clamped to dial bracket. (8) Filament leads should all be twisted. (9) Leads from C44

and C48 should be dressed close to chassis. (10) A.c leads

near R22 should be dressed away from R22. (I1) Leads

from SI1 to the first id transformer should be twisted and

dressed away from chassis. (12) Capacitors C7, C8, and C9

should be dressed perpendicular to chassis and away from each other and grounded metal parts. (13) Motor -cable

leads should be dressed away from pinion gear. (14) Blue

bus lead from "A" detector coil to "P" of tube No. 1

should be dressed centrally between band -witch shield and air trimmer C20. The following should be dressed away from the chassis: (IS) Yellow bus lead from "K" of tube No. 3

to S3. (16) Yellow btu lead from "OG" of tube No. 2.

(17) Blue bus lead from C47 to R26. Phonograph Attachment.-A terminal board is provided

for connecting a phonograph into the audio-amplifing circuit. RCA Victor Models R-93, R -93-A, R-93.2, or R-94 Record Players should be connected as follows: Remove the link from the phonograph terminal board. Connect green wire in Radio -Record switch cable to terminal I; yellow to terminal 2; shield to terminal 3; and tape up the red and blue. Connect a 2conductor twisted cable between the Record Player binding posts and the screwterminals on Radio -Record switch. If additional volume is desired, con nett an RCA Stock No. 9632 transformer between the 2 conductor twisted cable and the screwterminals on Radio - Record switch as follows: Yellow and brown transformer leads and on side of twisted cable to ground screwterminal on switch; black transformer lead to other side 'of twisted cable; and blue transformer lead to other ...terminal on twitch.

Lotdapeaker.-Two types of loudspeakers are used which will be referred to as types 1 and 2. In type 1 the cone centering diaphragm is cemented to a fixed ring, while in type t.2 the centering diaphragm is cemented to an adjustable ring. Replacement of cone for either type is identical. Center, ing of cone for type I loudspeaker is made with three narrow celluloid or paper feelers after first removing the front dust

cover and cutting free the cone centering diaphragm. The dun cover may be removed by a light application of acetone, ruing care not to allow the acetone to Sow into the air gap. The centering diaphragm should be cemented in place after placement of feelers. Sufficient time should be allowed for

the ambroid to set before removing feelers. Use ambroid to replace dust cover. Centering of cone for type 2 loudspeaker differ. only in that it ú not necessary to cut free the center, ing-diaphragm, adjustment being made in the usual manner by means of screws en the djuaable cone centering ring.



RCA PAGE 9-191

Main Pinion Gear. --Clearance between the small high. speed pinion gear "E" and the intermediate gear "K" deter. mines the amount of mechanical noise produced. Correct adjustment will give approximately 1/32 of an inch move. ment of hack lash at the end of pinion arm "G" when gear "K" is held stationary. Arm "G" must also be adjusted for correct mesh with motor shaft drive pin "F." With the motor shaft completely forward and pinion "E" tight against its front bearing, the pinion mounting stud "J" should he adjusted so that pin "F" meshes full thickness with the rotating arm "G." An increase of this mesh will increase over travel on tuning while a decrease of mesh will decrease the over travel. The elongated hole in the front bracket allows sußciént movement of the mounting stud "J" to per. mit above mentioned gear mesh adjustment.

"ManualElectric-Remote" Changeover.- (1) Link and arm adjustment-To properly line up the mechanical link between the switch shaft and throwout gear bracket "MM," the set screws holding the link arm on the switch shaft must be loosened, the switch turned to the "Manual" position (extreme right) and the link lever revolved until the distance between the linkconnecting pin (extends through chassis apron) and the right-hand (viewed from front) side of the slot, in front apron of chassis, is exactly 5/16 of an inch. If this adjustment is not properly made, correct operation of

sulated segment in the selector disc breaks the motor circuit, whereupon spring "C" will instantly disengage the motor pin "F" from the arm "G" on the small pinion driving gear and open contacts "E" and "D." Pushing another button will cause the above mentioned cycle to be repeated except that the motor will be interrupted by the insulated segment on a corresponding disc. The discs are individually adjustable on a drum mechanism, providing a choice of eight "Electric Tuned" "Broadcast" stations. The arrangement of the motor is such that its rotation will continue in the same direction regardless of the number of "Electric" tuning cycles until the tuning condenser approaches either fulbout or full -in of mesh, whereupon lever "H" trips switch S7 which reverses the direction of rotation. A throwout idler gear is link - coupled to the "ManualElectricRemote" control to dixon- nect the motor drive gear train when the control is thrown to "Manual" position.

Mechanism Adjustments The electric tuning mechanism is designed to be as simple

in construction and as fool proof in operation as is possible.. In order to maintain the accurate results possible with this device care must be taken in effecting any repairs or adjust, mests. Reference should be made to figure 4 and the following:

A -F -C and A -F Amplification Suppres iota Switches.- This switch assembly is located on the motor bracket and closes due to solenoid action of motor armature. The tension of the long contact spring "C" is importanein bringing about quick disengagement of the motor and in permitting the motor to pull into mesh with the drive mechanism. Normal adjustment is attained when the short springs "D" and "E" are aligned exactly straight with contact points separated approximately 1/32 of an inch and with the spring "C" spaced approximately 7/32 of an inch from spring "D" at the puint of contact. If necessary, in order to obtain positive pull -in and quick disengagement of the motor, the tension of spring "C" should be increased or decreased by bending. This action should be checked with the front apron of the thaw. raised two inches higher than the rear. Contacts of the switch must be kept clean. Crocus cloth or a relay burnisher may be used for this purpose.

RCA MFG. CO., INC.

Principle of Operation ELECTRIC TUNING The electric tuning mechanism consists essentially of a "Electric" or "Remote" tuning will not result. (2) Throw quick engaging and disengaging reversible electric motor, out Gear Adjustment-To obtain smooth operation on "Elec tuning condenser driving gear train, and eight mechanically the" or "Remote" positions it is important that the proper interlocked (pushing one button releases all others) station clearance is maintained between the throwout gear "M" and selector push buttons respectively wired to eight adjustable the intermediate gear "L." With the "Manual-ElectricRe station selector contactor discs (each with a motor stopping mote control thrown to "Remote" position (extreme left) insulated segment) mounted on a drum which is direct adjust the mesh between these gears by meant of the eccen coupled to the gang tuning condenser shaft. The arrange- enc screw "O" and lock nut "P," contacting the throwout ment permits any one of eight pre -determined stations to be gear bracket "MM," until there is approximately 1/64 of an electrically tuned in by merely touching the correct push inch backlash of gear "L" when gear "M" is held stationary. button. If all eight buttons are inadvertently locked in, firmly Vernier Tuning.-In case it becomes necessary to remove pushing the right-hand button will release them. tuning condenser drive shaft "T," it should be replaced by The operation may be more readily understood by ref- sliding anti -backlash gear "R" on condenser shaft apart so erence to figures I, 4, and 5. When the motor ú not ener that compression amounting to one tooth on the gear is ob gized, the armature is pushed to the rear or slightly out of tamed in the springs. Adjust mesh of gear "R" with pinion the magnetic center by tension of contact spring "C" and gear "U" on vernier shaft before tightening screws "S" so the motor shaft is disengaged from the driving gear train. that smooth tuning is obtained throughout the range. Pressing in any one of the eight push buttons will complete Motor Alignment.-The motor shaft must be exactly the motor circuit through a station selector contactor disc, aligned with the axis of the pinion gear with which it en assuming that the ManualElectricRemote" switch is in gages. This may be adjusted by loosening the mounting "Electric" position and that the insulated segment in the

contactor disc is not opposite its contactor. As the motor screws "V" of the motor and aligning shaft by sight. Correct alignment may be tested by slowly rotating motor and obsery starts, the armature will be drawn forward, due to solenoid ing the relation between the pin "F" of the motor .shaft and action, and the pin "F" on the end of its shaft will engage, the arm "G" on the pinion. The relation of the two should the arm "G" on the small main pinion gear, thereby driving remain the same throughout the revolution. Additional move the tuning mechanism. At the same time contact springs "E" ment for adjustment may be obtained by the motor bracket and "D" will be grounded, causing suppression of audio screws "W" if necessary. amplification and automatic frequency control during the tun Station Selector Drum. (1) Bearing Adjustment-The ing cycle. The motor will continue to operate until the in, selector drum may be removed by unscrewing the two bear ing adjusting screws "X" on the front and rear bearings and sliding shaft out of slots on frame. To replace drum, the reverse procedure should be followed holding bearing adjusting plates "Y" firmly against the shaft and tightening adjust, ing screws. (2) Contact adjustment-Two types of contact strips are used. They are designated on figure 4, as types l and 2, on which the individual contacts are respectively adjustable and fixed. On type 1, the individual contacts should be adjusted by setting the end contact springs near the mid -position of their travel and aligning the remaining springs to them by means of a straight edge. Either type of contact strip should be adjusted to the selector drum by firmly placing two selector adjusting keys in the station adjustment strip, positions I and 8 (locking respective discs), loosening contact strip adjusting nuts "Z" and shift. ing the contact strip until the end contacts are exactly centered on the respective disc insulating segments. More accurate adjustment may be made by silhouetting the point of contact with a piece of white paper held behind the con, tact. Adjustment will be facilitated by removing complete assembly from rear of tuning condenser by unscrewing the three mounting screws. Contacts and discs must be kept free of dirt, filings, and other extraneous matter.

Lubrication.-The dial pointer slide should be greased with petrolatum. This same lubrication should be applied lightly to all gear faces of the drive mechanism and sparingly with a cloth to the station selector discs. Any good house, hold oil, such au "3INONE," is suitable for the motor shaft bearings. A light grade of engine oil should be used for all gear bearings. Medium viscosity engine oil, similar to "PYROIL" (B), should be applied between the thrust washers on the motor shaft. "CASTORDAG," a mixture of graphite and castor oil, is recommended for ,use at the selector drum endbearing slog and at the borings of cable pulleys.

Station Adjustment Any eight stations may be chosen for "Electric" tuning.

Remove the two escutcheon plates from the side of the dial, place proper call letter labels in the celluloid windows, and replace escutcheons. Turn the power on and proceed to set up the "Electric" tuning as follows:

1. Set Range Selector to "Standard Broadcast." Motor Reversing Switch.-It is necessary to automatically 2. Turn "ManualElectricRemote" control to "Electric." stop and reverse the drive motor before the tuning condenser 3. Turn Fidelity control counterclockwise. reaches the ends of its travel. Approximately 175 degrees of 4. Press push button N. 1 (left) and wait until station sweep is required, and the reversal must take place above pointer comes to rest. 1,700 kc and below 540 kc but not too near the limits of the 5. Turn the " Manual Electric Remote " control to scale. The coupling between the station selector drum and "Manual." the tuning condenser shaft should be attached so that the 6. Remove adjusting key from receptacle on top of sta reversing switch trip lever "H" is exactly vertical when the tion selector drum mechanism. condenser is fullout of mesh. There should be 1/32 of an 7. Insert key in position marked "1" in station adjust - inch clearance between the end of the condenser shaft and ment strip and push the key all the way down to prop - the selector drum shaft. While the trip lever is in this post- erly fit in slot in disc. tion the reversing switch bracket should be adjusted by means 8. Tune the receiver very carefully by means of the of its elongated mounting holes until the switch pin "I" just manual tuning knob and the "Magic Eye." to station lightly touches trip lever "H." chosen for N. L.

9. Remove key. IO. Turn the 'Manual-ElectricRemote" control to "Elec-

tric " Button No. 1 is now properly set for "Electric" tuning.

Proceed similarly for the other seven push buttons, matching each station on the dal with the same number on the station adjustment strip. 3epeat the above steps but place the key respectively in pontions 2, 3, 4, etc., and in each case tune to the proper station. Pressing the proper button will now cause the desired station to be tuned in electrically.

Armchair Control When a Model G8 armchair control is attached to the

receiver as shown in figure 5 it duplicates the action of the push buttons on the front panel when the "Manual -Electric. Remote" control is turned to "Remote" position.

Service Hints a. Capacitor CI8 should be carefully checked for leakage

or short circuit in cases of intermittent operation or no operation. R9 should be shorted out and CI8 replaced by Stock No. 4839, as shown by the Schematic Circuit Diagram figureuit. I,Capacitor

CS should be checked d for in he event e in

s cleakage or short circuit.

MODEL 813K Tuner Data Specifications

e. Resistor R5 was 33,000 ohms in some instruments. Replace with Stock No. 12333.

d. Capacitor C16 was 82 mmfd. in some instruments. Replace with Stock No. 14021.

e. Capacitor C38 was two 0.5 mfd. in parallel on some instruments. Replace with Stock No. 30623.

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192 RCA MODEL 813K MODEL 816K Tuner Mechanism Adjustments


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MODEL 813K RCA MFG. CO., INC. Parts List

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194 RCA MODEL 816K Parts List RCA MFG. Co., INC.

ST DESCRIPTION S No. K DESCRIPTION

RECEIVER ASSEMBLIES 14886 Pulley -Indicator drive cord pulley -located on right or left hand dial bracket

14726 Arm -Hub and arm complete with set screws -Connects 14946 Reactor -Filter reactor (L37) station selector drum to rear of tuning condenser shaft 13250 Resistor -330 ohms, carbon type, } watt (R15)

14883 Arm -Arm and hub assembly located on "Manual-Elec- 11355 Resistor --390 ohms, carbon type, } watt (R6) 0

14517 tric-Remote' switch shaft

Board-Antennang 30158 11935

Resistor -820 ohms, carbon type, } watt (R30) Resistor -1000 S

12717 and ground terminaloadboard

Board -Phonograph terminal board 14720 ohms, carbon type,01

Resistor -1000 ohms, carbon 1/10

watt 2, R13)ña

type, } (R10, R36) ,o 14885 Bracket -Left hand dial bracket and pulley assembly 14993 Resistor -1200 ohms, carbon type, 1/10 watt (R41) .~.,N 14884 Bracket -Right hand dial bracket and pulley assembly 13031 Resistor -3300 ohms, carbon type, 1/10 watt (R29) 14878 Bracket -Tuning tube mounting bracket and clamp 5114 Resistor -15,000 ohms, carbon type, 1 watt (R31)

,.~. o

assembly 14078 Resistor -18,000 ohms, carbon type, 1 watt (R24) Z ó 5237 Bushing -Variable condenser rubber mounting bushing 14284 Resistcr-22,000 ohms, carbon type, 1/10 watt (R37) 4 x

assembly 12454 Resistcr-33,000 ohm, insulated, } watt (R4, R12) e 14919 14918

Cable -5 conductor push-button selector cable Cable -7 conductor tuning drive motor and push-button

selector cable

12333 11365 5145

Resistor -68,000 ohms, carbon type, Resistor -82,000 ohms, carbon

yp, } watt (R3) type, } watt (R32)

Resistor -100,000 ohms, carbon type, } watt (R14, R28) co

éco 12607 12581 11350

Cap -First or second I -F transformer shield cap Cap -Third, fourth or fifth I -F transformer shield cap Cap -Grid contact cap

11398 11452

Resistor -220,000 ohms, carbon type, 1/10 watt (R40) Resistor -470,000 ohms, carbon type, 1/10 watt (R17, ÿ é AI

e.

12884 Capacitor -Adjustable Adjustable trimmer (long) (C3, C10, C15, C20, C65, C68)

11172 11397

Resistor -470,000 ohms, carbon type, } watt(R8)° Resistor -560,000 ohms, carbon type, 1/10 at (R1,

g be 14392

13002 Capacitor -4.7 Mmfd. (C62) Capacitor -12 Mmfd. (C87( 5036

R27) Resistor -560,000 ohms, carbon type, } watt (R11)

C./ oc

30016 Capacitor -12 Mmfd. (C34) 12013 Resistor -1 Megohm, carbon type, 1/10 watt (R26) 12896 Capacitor -15 Mmfd. (C64) 3033 Resistor -1 Megohm, carbon type, I watt (R7) mm 30015 Capacitor -15 Mmfd. (C33) 12200 Resistor -1 Megohm, insulated, } watt (R16) E.5 14021 Capacitor -22 Mmfd. (C16) 12679 Resistor -2.2 Me oh gm,insulated, watt (R19, R20) 9 12948 Capacitor -33 Mmfd. (C40) 14876 Resistor -Voltage divider comprising one 1450 ohm, one

comp} 5200 ZB 14910 Capacitor -90 Mmfd. (C21) ohm, one 7700 ohm, one 18 ohm and one 82 XX 14906 Capacitor -96.5 Mmfd. (C9) ohm sections (R33, R34, R35, R38, R39)

I

I m 14906 Capacitor -100 Mmfd. (C7) 14887 Retainer -Indicator drive cord pulley retainer betao 12720 14960

Capacitor -100 Mmfd. (C36, C58) Capacitor -100 Mmfd. (C73)

30014 30013

Scale -19 meter glass dial strip Scale -25 meter glass dial strip 'CT.. ~ as 14907 Capacitor -103.5 Mmfd. (C8) 30011 Scale -31 meter glass dial strip Scale

corn 14909 Capacitor -110 Mmfd. (C6) 30010 _. -49 meter glass dial strip

Scale -"C" band glass dial strip 12404 Capacitor -120 Mmfd. (C35, C71, C72, C75) 14962 14712 Capacitor -180 Mmfd. (C31, C32) 14961 -- Scale - band glass dial strip ben 14711 Capacitor -220 Mmfd. (C28, C29) 30286 Scale -"A" band glass dial strip MN 12952 Capacitor -330 Mmfd. (C2, C19, C45) 4669 Screw -No. 8-32x5/32 square head set screw for drum '.-, 14710 Capacitor -430 Mmfd. (C22, C23) Stock No. 14856, arm Stock No. 14726 and Stock 13052 Capacitor -470 Mmfd. (C14) No. 14883 14911 Capacitor -580 Mmfd. (C11) 12418 Screw -No. 8-32x3/16 milled head screw for gear Stock 13140 30160

Capacitor -1500 Mmfd. (C83) Capacitor -2700 Mmfd. (C66) 14848

No. 14739 Selector -Station selector drum mechanism -comprising

e tw

12897 Capacitor -4700 Mmfd. (C5) selector contactor disc's, spring contacts, and motor re- ¡ i q 4838 Capacitor -.005 Mfd. (C49, C51) versing switch assembled in metal frame 6 4937 Capacitor -.01 Mfd. (C50) 14882 Shield -Chassis bottom shield

_

oe 3 -q5

13138 Capacitor -.01 Mfd. (C17, C24, C27, C30, C39, C46, 12735 Shield -Dial lamp shield C69, C70 12008 Shield -I -F transformer shield can O r 11315 Capacitor -.015 Mfd. (C47) 14901 Shield -Rubber shield for tuning tube a ó y

4870 Capacitor -.025 Mfd. (C42) 14892 Slide -Indicator pointer slider and spring assembly J B 4886 Capacitor -.05 Mfd. (C61) 11195 Socket -5 contact 5T4 Radiotron socket .E E

4839 12741

Capacitor- 0.1 Mfd. (C4, C18, C25, C26, C37, C60) Capacitor -0.5 Mfd. (2 in parallel) (C38)

11196 Socket -8 contact 6K7, 6L6, 6J7, 6F8, 6H8, or 6C5 Radiotron socket

" 0 a i o

5212 14377

Capacitor -16 Mfd. (C55) Capacitor -16 Mfd. (C57)

14877 Socket -8 contact 6J7 Radiotron impregnated socket for socket mounting plate Stock No. 12471 and 6K7 or s e

E 13611 Capacitor -20 Mfd. (C56) 6L7 Radiotron

S g

é 14531 30053

Capacitor -25 Mfd. (C53, C54) Capacitor Pack -Compensating capacitor pack comprising

14114 13638

Socket -Dial lamp socket Spring -Drive cord tension spring Cr. ma

two .015 add. capacitors, one 27,000 ohm and one 12007 Spring -Retaining spring for core Stock No. 12006 .,- 1v 33,000 ohm resistors (C41, C43, R21, R23) 3676 Spring -Tension spring for link and arm Stock No. n

14902 Capacitor Pack -Comprising two sections 10 mfd. each 14883 ë Q ó. (C44, C48) 14694 Spring -Tension spring for station selector push-button 2« Ea

14948 Coil -"A" band antenna coil (L7, L8) switch latch bar 14949 Coil -"B" band antenna coil (L5, L6) 14889 Strap -Strap and bolt assembly used to hold glass dial a ó.9'

E 14950 Coil -"C" band antenna coil (L3, L4) strips in position oÿ = 14951 Coil -Special band spread antenna coil (L1, L2) 14891 Strip -Finish strip used between glass dial strips ó t 14867 Coil -"A" band detector coil (L21, L22) 14742 Stud -Mounting stud for gear and arm Stock No. 14738 > « -.C.)(.1

14952 Coil -"B" band detector coil (L20) 14874 Switch - "Manual -Electric -Remote" switch (S6. S10, ,n, g I J, 14953 Coil -"C" band detector coil (L19) S13) ox if g.a

14954 Coil -Special band spread detector coil (L18) 14863 Switch -L -F tone and power switch (S7, S9, S11) o 2 14869 Coil -"A" band oscillator coil (L16, L17) 14732 Switch -Motor reversing switch and mounting plate for 14 ins 14955 Coil -"B" band oscillator coil (L15) station selector (S12) 14956 Coil -"C" band oscillator coil (L14) 14947 Switch -Range switch (S2, S3, S4) 14873 Coil -19 meter band oscillator coil (L9, L10) 14728 Switch -A -F -C and A -F amplification suppression switch m ..em . ,

14872 14871

Coil -25 meter band oscillator coil (L11) Coil -31 meter band oscillator coil (L12) 14904

(S8) Switch -Station selector switch parts comprising one 4 Nr.

mi" . 14957 Coil -49 meter band oscillator coil (L13) point contact board, one 4 point conductor plate, ín- 14858 Condenser -3 gang variable tuning condenser complete sulator and lockplate

with gear train (C1, C12, C13, C59) 14703 Tone control -H -F tone control (R26, S5) 5040 Connector -4 contact female connector for reproducer

cable 14706 Transformer -First I -F transformer (L23, L24, L26,

C22, C23) 14733 Contact -Spring contact for engaging discs in station

selector drum for type 1 contact assembly 14968 Transformer -Second I -F transformer (L26, L27, L28,

C28, C29, C76, R18) 30365 Contact -Comprising 8 spring contacts assembled on in-

sulating strip for engaging discs in station selector 14708 Transformer -Third I -F transformer (L29, L30, C31,

C32)

14857 drum (type 2 contact assembly)

Cord -Indicator drive cord 14709 Transformer -Fourth I -F transformer (131, L32, L33,

C35) 5 12006 Core -Adjustable core and stud for I -F transformers 14969 Transformer -Fifth I -F transformer (L35, L36, C71,

°0 3 ey

14890 Cushion -Black rubber dial cushion C72, C73, R37, R40) a 14862 Drive -Tuning condenser vernier drive shaft and pinion 14855 Transformer -Driver transformer (T2)

14856 gear

Drum -Drive cord drum complete with set screws 14944 Transformer -Power transformer 105-125 volts, 50-60

cycle (T1) é ee u

- m 14731 Drum -Station selector drum rotor -comprising B station 14945 Transformer -Power transformer 106-125 volts, 26-60 a

5 9d 10907

selector contactor discs assembled on shaft Fuse --3 Amp. (F1) 30156

- cycle (Ti) Transformer -Power transformer 100-130/140-180/195- á 76e 0

2 a-- '5 14738 14739

Gear -Drive pinion gear and arm Gear -Drive gear and set screws -located on tuning con-

de er knob shaft 12861

250 volts, 50-60 cycle (Ti) Volume Control (R22)

é.5 s °mil « Ti

14734 Gear -Intermediate In ermed ate gear assembly -comprising one .749- é út1 ir 14735

in. O.D., 34 tooth gear and one .291 -in. O.D., 12 tooth pinion assembled.

Gear -Intermediategear assembly14606 -comprising one 14922

REPRODUCER ASSEMBLIES (RL76-3) Ca Dust cap for cone center Coll -Reproducer field coil (L38)'.53..

m $ a

1 eÿ.5 ç 5 ¡ w : 1.541 -in. O.D., 72 tooth gear and one .291 -in. O.D.,

12 tooth pinion assembled. 14602 Cone -Reproducer cone, voice col, center suspension and .3 n a . e G 14860 Gear - Intermediate gear assembly - comprising one 5039

dust cap (L34)P Plug -4 contact ale for I

i-- toe 1.541-ín. O.D., 72 tooth gear and hub assembled 30131 plug reproducer

Reproducer -Complete g u I I a,w r 14861 Gear-Throwout gear and bracket 14992 Transformer ú vas 14900 Indicator -Station selector indicator pointer 14357

-Output transformer (T3, C52) Washer

. o o« «x 5226 Lamp -Dial lamp -Spring washer to hold field coil securely p ú s 1.

14729 Motor -Tuning drive motor for 60 cycle models only (M-1) MISCELLANEOUS ASSEMBLIES c roc

hS ,...XXX 14730 Motor -Tuning drive motor for 25 cycle models only (M-1) 14745 Button -Station selector switch button

a bet-. .eam 14859 Plate -Tuning condenser front plate and studs assembled 30381 Card -Call letter cards for station selector

12471 for mounting drive gears

Platt -6J7 socket mounting plate assembly for cushion 14925 14929

Crystal -Dial escutcheon crystal only Escutcheon -Dial and tuningat tube escutcheon only -less

N NNn nom m e n a0

m

socket -less socket crystal and buttons 30557 Plug -Power cord plug less fuses Stock No. 10907


RCA 3IFG. CO., INC.

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RCA PAGE 9-195

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-'AGE 9-196 RCA



RCA PAGE 9-197

RCA MFG. CO., INC.

REAR APRON OF CHASSIS

G

L12-OSC. 31 METER 9,60014.C.

L11-OSC. 25 METER 11,700 K.C.

L10-OSC. ' I6, 300 19 METER

K. C.

L14-OSC. 'IC 'BAND 9500K.C.

BLAC

OUTPUT OUTPUT

TI

RECT.,

COMP. PACK

BLUE

r RECT.

m BLUE

'I I

o POLE

6J 7

O5C.

BLACK- RED

512

BLACK'BRO

BLACK- RED TR

óeL17-OSC. 7)." BAND 600K.C.

REMOTE ONNECTION

BROWN --I BLUE ----t GREEN ----3 REO.6141E9--6 BLUE'YEUD-O

6REEM1'ELLOS- REO -YELLOW -O

STATION SELECTOR DISCS

BLACK- BROWN

ELLO

¡BUCK I MO TK.

BLACK

TONINO MOTOR

74

D

BOTTOM TERM.

AUDIO AMPLIFICATION AND AEC. SUPPRESSION

SWITCHES

TUBE 14_

HDLE"C"

MODEL 816K Socket,Trimners Voltage

CIO-OSC. C15-OSC. C68-OSC. C65-OSC. ;49 METER ¡"A"BANO ,"B" BAND /-C 'BANC

610OK.C. 150014.C./ 600014.C.i 2gODOK.C. I- /"

' , AUDIO " CIA; ¡ DRIVER ¡ , 2no0ET a " OSC. ' ""

CONTROL / "

/ i TO 11 B

C68 ¡ Cy"

CIO

UC^UO

COO-DET. N 49 METER 6100 K.C.

C3 -ANT. 49 METER 6100 K.C.

6G5

6J7

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DET . IF', I

6LT

2

L24

D:

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49 ME1 IRW_ YELLO

'C"BAND

R. F.

SOLE

IeT. S.r.I.F. AUD10 TRA NS.

SEC.ADJ. ® L36 460 K. C.

0- ------- SEC. ADJ. - 2^' LE, 124

46014.C.

LEB, CTS=,T.,

RIS.C75-;,

5/ GREEN' nO.I. F.TRANS.

6147

7

A.VC. I.F.

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BLACK- EYE BROWN

6

TOP VIEW- FRONT OF CHASSIS A=YELLOW

BROWN GREEN

BLUE -- R e° MUSIC- ELECTRIC B' -CREEN 'C" -BLACK

STATION SELECTOR PUSH BUTTONS SPEECH MANUAL

OREEN

DIAL LAMPS

STATION SELECTOR PUSH BUTTONS

© RCA MFG.Cv., INC T-70837-0

SEC.ADJ. L27 460 K. C.

SEC. ADJ. L30 460 K.C.

SEC. ADJ. L33 46014.C.

- i i 340V. t I A.

m ( R

I

-3.2V

369V.

RECT. 5T4

340V. A.C.

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i LSV. j A.C.

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"RI,GReOTR. TO TUNING TUBE 6.4V..C.6G9

I

TERM. I-A.C., C G I BRO.

ings. The value shown in parentheses with asterisk (6) indicates operating conditions without voltmeter loading. The other value (generally lower) is the actual measured voltage and differs from the value shown in parentheses because of the additional loading of the voltmeter.

--18V

ELECT CAP C53

OUTPUT 6L6

--311v _® M2V.r©v

I

A.C. i 369V. i ; 350V. 6,qV ; 360V

OUTPUT Ì I

A.L. 1 6L6 1 1 1 1 1

}

196V.

ELECT I CAP. I C57

(-32V.) `b -0.4V.

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TRANSF.

RI. I

ADJ.

iX r196V, e

191V.I OV. (i) 6.4V III A.Ç_` 1 I

191V.I -0.2V. 96VI. , I OSC. CONTRI

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I I I Ill

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I I I I I I

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1eT.I.F. 6147

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A.V.C.[.F. 6147

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A.C.

(OU..) --_- -0.3V. --3.2V.----- 2re DET.

6146

Figure 6-Radiotrolt Socket Voltages, Coil, and Trimmer Locations Measured at 115 volts, 60 -cycle supply --Tuned to approximately 1,000 kc ("Standard Broadcast") -"Manual" control -

No signal being received -Volume control minimum -Fidelity control optional Note: Two voltage values are shown for some read- Voltage values as specified should hold within ±20%

when the receiver is normally operative at its rated line voltage. To duplicate the conditions under which the voltages were measured requires a 1,000 -ohm -per -volt d -c meter, having ranges of 10, 50, 250 and 500 volts. Use the nearest range above the specified measured voltage. A -c voltages were measured with a corresponding a -c meter.



PAGE. 9-198 RCA

MODEL 816K "Electric Tuning"Wiring Specifications

RCA MFG. CO., INC.

Electrical Specifications FREQUENCY RANGES

"Standard Broadcast" (A) 530-1,720 kc "M.W." Medium Wave (B) 2,400.7,100 kc "S.W." Short Wave (C) 7,100-21,750 kc "49M." (49 Meters) 5 970-6,240 kc "31M." (31 Meters) 9,410.9,690 kc "25M." (25 Meters) 11,680-11,920 kc "19M." (19 Meters) 15,090.15,380 kc

Intermediate Frequency

RADIOTRON COMPLEMENT (1) RCA -6K7 R -F Amplifier (2) RCA -6L7 First Detector (3) RCA -6J7 Heterodyne Oscillator (4) RCA -6J7 Oscillator Control (5) RCA -6K7 First I -F Amplifier (6) RCA -6K7 A -V -C, A -F -C, and Eye I -F Amplifier (7) RCA -6K7 Second I -F Amplifier (8) RCA -6H6 Second Detector

Pilot Lamps (11)

POWER SUPPLY RATINGS

Rating A

R -F ALIGNMENT FREQUENCIES "49M." (49 Meters) 6,100 kc (osc., det., ant.) "31M." (31 Meters) 9,600 kc (osc.) "25M." (25 Meters) 11,700 kc (osc.) "19M." (19 Meters) 15,300 kc (osc.) "S.W." Short Wave (C).. 9,500 kc (osc ), 20,000 kc (osc.) "M.W." Medium Wave (B). 6,000 kc (osc.) "Standard Broadcast" (A)... 600 kc (osc.), 1,500 kc (osc.)

460 kc

( 9) RCA, -6H6 A.V.C., A.F.C., and Eye (10) RCA -6C5 First Audio Amplifier (11) RCA -6F6 Audio Driver (12) RCA -6L6 Power Output (13) RCA -6L6 Power Output (14) RCA -6G5 "Magic Eye" Tuning Tube (15) RCA -5T4 Half -wave Rectifier (16) RCA -5T4 .... Half -wave Rectifier

.. Mazda No. 46, 6.3 volts, 0.25 amp.

105-125 volts, 50-60 cycles, 200 watts Rating B . 105-125 volts, 25 cycles, 200 watts Rating C 100.130/140.160/195.250 volts, 50.60 cycles, 200 watts

POWER OUTPUT Undistorted 25 watts Maximum 30 watts

LOUDSPEAKER

Type 12 -inch Electrodynamic Impedance (v.c.) 11.5 ohms at 400 cycles

RED-GLOWREEN - BLUE-YEL OREEN-VELLOW

Ìi17i-

6 D

GREEN GREEN BLACK -RED TR

J V QW 7 Z W RED -BLACK

ZppIO4 REMOTE rJ/ TO MANUAL IND.

` TO 6.5 V.A-C SUPPLY

O.TO ELECTRIC IND.

ooh MANUAL-ELECTRIC Y V REMOTE SWITCH

TO A.F C. DIODE CATHODE

S WIRE CABLE

BRED -YELLOW - GREEN -YELLOW

BLUE -YELLOW -RED GREEN -RED

GREEN -BLUE

BROWN ..... rÌlff 1 ¡ - -CABLE

LONG LEAD--- DUMMY TERM. 1 FOR"REMOTE` -RED- BLACK ,( CONNECTION.

1

-ß:lÌ E TO A.F.C. DIODE CATHODE

GEAR TRAIN,¡ O TO AUDIO GRID ENGAGING 11,- PIN `rr T

SHMOAFRT l' MOTOR ARMATURE MOVES SHAFT FORWARD AND CLOSES THESE II CONTACTS WHEN RUNNING,

B II A .l, lin .

BLACK -RED TR.

YELLOW

GREEN

REO GREEN

BLUE

Z o

BLAC K

REACTIVE WINDING BROWN- BLACK

'..--ARMATURE TUNING MOTOR

INSULATED SEGMENT


MECHANISM j (DRIVEN BY TUNING CONDENSER)

24VOLT WINDING OF POWER TRANSF.

r- ---, G8 -ARMCHAIR CONTROL (NOT SUPPLIED WITH RECEIVER)

5 .. . l r'-.a f== 11 r i ¡,¡1 I ___] l i C T 1 I y' I I

1 I

Ir___711'j111 C_UI I Lr__-41,J.111_- 1 11 I 1111 r_J

11111I1ÌÌ1 asai'+fsisnsashY,_V=i

REVERSING MOTOR SWITCH -OPERATED REVERSING -7 BY LEVER NEAR ENDS OF

SWITCH BY

CONDENSER TRAVEL.

©RCA MFG.CO.,INC. P-84130-0

BLACK

L -J

7 WIRE CABLE

BROWN -BLACK BLACK- RED TR.

TOP VIEW -REAR OF CHASSIS

Figure 5-"Electric Tuning" Wiring Diagram (Viewed from rear of chassis)

Copyright, 1957, RCA Manufacturing Co., Inc. Trademarks "R, diotron," "Magic Eye," "Magic Voice," "Magic Brain" Reg. U. S. Pat. Olf. by RCA Mfg. Co., Inc.



RCA PAGE 9-199

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RCA PAGE 9-20r

rADDEL 910KG,U126,17128

Schematic ,Socket Tr inners ,Drive Data



?'AGE 9-202 RCA MODELS 910KG,t126,U128 Chassis Wiring,Voltage Tr ansformer,Speas.

RCA MFG. CO., INC.

Measurements made to chassis unless otherwise indicated. with set tuned to quiet point, volume control at minimum. Values should hold within approximately ±20% with 117 Jolt a -c supply.

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RCA PAGE 9-20$

MODELS 910KG,U126,U128 RCA MFG. CO., INC.

General The RCA Victor Model 910KG Receiver employs a ten -

tube, three -band, "Magic Brain" superheterodyne circuit, the arrangement of which is shown in the schematic circuit diagram. Features of design include: "Electric Tuning" for eight broadcast stations; a link -coupled antenna circuit; magnetite -core i -f transformers and. "A" -band oscillator coil; full automatic volume control; Victrola jack and switch; "Magic Eye" tuning tube; improved 12 -inch dust -proof electrodynamic loudspeaker; aurally compensated audio volume control; continuously variable high -frequency tone control; provision for armchair control attachment; illuminated band indicator; noise -reducing antenna adjustment on "A" band; temperature -stabilized capacitors; phase inverter audio amplifier; and push-pull power output stage.


Service Data Victrola Attachment. -A jack located near the "Magic

Eye" tube is provided for connecting a Victrola Attachment into the audio -amplifying circuit on Model 910KG. The cable running from the Victrola attachment should be terminated in a Stock No. 31048 plug to fit the jack.

Loudspeaker.-Centering of the loudspeaker is made in the usual manner with three narrow celluloid or paper feelers after first removing the front dust cover. This may be removed by softening its cement with a light application of acetone, using care not to allow the acetone to flow into the air gap. A dust cover should be cemented in place upon completion of adjustment.

Precautionary Lead Dress. - (1) The lead from the left pilot light should be kept behind the bulb and toward the "Magic Eye," to keep it away from the 6F5 grid cap, (2) leads from mica trimmers to coil should be kept away from the coil and other parts, (3) leads on oscillator coil which are an extended part of the coil winding should be as short as possible, (4) "C" band series capacitor C31 must have leads as short as possible, (5) all leads from antenna board to antenna coils should be dressed toward back apron, (6) the one lead of the, line cord and the primary lead of the power transformer which run to the power switch should be twisted together, (7) shielding on leads to Victrola switch should be kept away from the switch terminals and jack.

Circuit Data,Antenna Lead Dress,Tuninn Dial

Description radio receiver similar to the Model 910KG, and in addition, a phonograph turntable with a self-starting electric motor, and crystal pickup. The phonograph will play ten- or twelve - inch records; and automatically shuts "off" at the end of record play. The output of the pickup is "shorted" out when the pickup is on the pickup rest.


radio receiver similar to the Model 910KG, with an automatic phonograph methanism. The phonograph has a self-starting motor, crystal pickup, and may be set to play ten -inch and twelve -inch records singly, or automatically. In the automatic position, seven twelve -inch; eight ten -inch; or a mixed group of seven, ten- and twelve -inch records, may be played in succession. The output of the pickup is "shorted" out when the pickup is on the pickup rest.

Antenna Connections RCA Victor Master Antenna Kit.-Connect the twisted -

pair transmission line to terminals Al and A2 on the terminal board at rear of chassis. Connect the counter -poise to A3. Terminal G may be connected to ground, but this connection is nod necessary for correct operation.

Noise -Reducing Adjustment.-After the RCA Victor Mas- ter Antenna Kit is connected to the receiver, tune the receiver to a point near 900 kc where no station is heard. Turn volume control clockwise until noise is heard. If no noise of a regular character is audible, start any brush -type motor - driven appliance, such as a vacuum cleaner, electric razor, refrigerator, etc., but do not bring it too near the receiver. This will generate noise as a continuous'crackling, or buzz. Adjust C5, which is mounted behind the antenna terminal board, to a point where this noise is reduced to a minimum.

Adjustment of the noise reducing trimmer C5 should be made in the customer's home, with the RCA Victor Master Antenna connected to the receiver.

This adjustment is effective only when the RCA Victor Master Antenna is used. For all other types of antenna, the noise -adjustment trimmer C5 should be screwed all the way down.

Other Antennas.-Use terminals Al and A3 on the receiver terminal board as antenna and ground connecting points respectively. Terminal A3 may be connected to- ter- minal G, unless this causes interference, in which case this connection should be omitted.

0 IO ZO 30 40 510 60 701 80 90 100 IIO 120 130 140 150 160 170 180

SNORT WAVE

t0NO0,i-SONM7-NMA-ROAM MIN -TOLTO -NTTSRVII maw -MARRON-WINOS. MIN-LOMDO0 HAVANA-ONO-MNIS-SYOMSY-MAORD 10.000M - ROAN - PAINS CONDOM-IARM-,Oat MEW TORI( u0- Ma1ROURME - SRNIOIINA - 31 M KAHN á3M MDsCOW MOOS 19 M 16 M

NEW YORK LONDON-MTTSMROM 13M

8 9 10 12 14 16 18 20 22 MC

STANDARD BROADCAST

. , ,. , .

2.3 2:5 3.0

POLICE

MEDIUM WAVE

AIRCRAFT

4.0

AMATEUR

POUCE

A R R

120 R R

140 R R. ., .

160 5.0 6.0 7.0 MC

B 6]M AIRCRAFT

cotoMMA If. AMERICA)

49M - ANUNMAO - SITTLOROM 10001A -MUM - CIKA00 - NEW YORK MIX. OTT- -TORONTO-CARACAS

0 IO 20 30 40 50 60 70 80 90 100 110 IzO 130 140 150 160 370 180

1111111111111111111111111111111111111111111111111

Figure 1-Tuning Dial, and Corresponding 0-180° Calibration Scale

The corresponding dial setting for any reading of the calibration scale can be determined by drawing a line straight up from this point; for example, 151.5° on the calibration scale corresponds to a dial reading of 1,500 kc on "A" band. Read instructions under "Alignment Procedure."

55 60 70 80 100



2041 RCA MODELS 910KG,U126,1128 Alignment ,Turntable Data

RCA MFG. CO., INC.

Steps Connect the high side of test -oscillator to - Tune test-

oscillator to - Range Selector

Set tuning gang to-

Adjust the following for maxeak output

No. 1 6K7 I -F grid cap m series

with .01 mfd. 455 kc «A" Quiet point

between 550-750 kc

(2nd I-F1Transformer)

No. 2 6A8 Det. grid cap in series with .01 mfd.(1st , kc "A" L8, L9

I -F Transformer)

No. 3 AZ Connect Al to chassis. 20 me "C" 20 me

(147.5°) C24 (osc.)*

C8 (det.)t

No. 4 A2, in series with 100 mmfd. Connect A3 to chassis. 6,100 kc "g'. 6,100 kc

(145.5°) C25

No. 5 AZ in series with 100 mmfd. Connect A3 to chassis. 1,500 kc "A" 1,500 kc

(15L5°) C29 (osc.) C3 (ant.)

No. 6 A2, in series with 100 mmfd. Connect A3 to chassis. 600 kc ..A., 600 kc

(29.5°) L17 (osc.)

No. 7 A2, in series with 100 mmfd. Connect A3 to chassis.

1,500 kc "A,. 1,500 kc (151.5°) C29 (osc.)

* Use minimum capacity peak if two peaks can be obtained. Check to determine that the correct peak has been used by turning to 141.5° (19,090 kc), at which point a weaker signal should be received.

** Use minimum capacity peak if two peaks can be obtained. Check to determine that the correct peak has been used by turning to 124° (5,190 kc), at which point a weaker signal shauld be received.

f Rock gaºg condenser and use maximum capacity peak if two peaks can be obtained with C8.

Cathode -Ray Alignment is the preferable method. Connec- tions for the oscillograph are shown in the chassis drawing.

Output Meter Alignment.-If this method is used, connect the meter across the voice coil, and turn the receiver volume control to maximum.

Test-Oscillator.-For all alignment operations, connect the low side of the test -oscillator to the receiver chassis, and keep the output as low as possible to avoid a -v -c action.

Calibration Scale on Indicator -Drive -Cord Drum.-The tuning dial is fastened in the cabinet and cannot be used for reference during alignment, therefore a calibration scale is attached to the rear of the indicator -drive -cord drum which is

mounted on the front shaft of the gang condenser. The setting of the gang condenser is read on this scale, which is

calibrated in degrees. The correct setting of the gang in degrees, for each alignment frequency, is given in the alignment table.

Turntetble Mechanism Model U-126 The crystal unit of the pickup is sealed in a metal case

against extremes of climate. The offset mounting of the crystal unit in the pickup arm insures ideal tracking between needle and record grooves. If failure should occur due to a defective crystal, no attempt should be made to repair the crystal, but a new replacement crystal unit should be installed.

The turntable drive is a self-starting, variable -speed, governor -type, induction motor. The motor speed adjusting screw is located under the turntable, and may be adjusted by inserting a screwdriver thru one of the holes in the turntable, after the hole has been lined up with the screw. The flexible motor drive arrangement is similar to the U-128. The motor speed should be '78 r.p.m., and may be checked by placing a piece of paper between a record and the turntable, with the paper protruding beyond the edge of the record, and then counting the number of revolutions of the turntable per minute. The motor is designed to be simple and foolproof in operation. Occasionally, however, certain adjustments and lubrication may be required. These are illustrated and explained in figure 12. In addition, an application of oil to the felt pad, which rubs against the governor disc, will insure smooth operation.

The turntable is started by pushing to the rear. the motor starting lever, which appears to the right of the turntable. The adjustment on the automatjc motor stopping switch should be made so that the switch will snap to the "off" position when the needle in the pickup head is 13/4 inches away from the center of the turntable. The locking screw and details of the switch mechanism are shown in figure 14. The locking screw and nut may be reached, from underneath the motor board, or, by an open end wrench, under the turntable.

As the first step in r -f alignment, check the position of the drum. The "0" mark on the drum scale must be vertical, and directly over the center of the gang -condenser shaft when the plates are fully meshed. The drum is held to the shaft by means of two set screws, which must be tightened securely when the drum is in the correct position.

Pointer for Calibration Scale.-Improvise a pointer for the calibration scale by fastening a piece of wire to the gang - condenser frame, and bend the wire so that it points to the "0" mark on the calibration scale when the plates are fully meshed.

Dial -Indicator Adjustment.-After fastening the chassis in the cabinet, attach the dial indicator to the drive cable with indicator at the 530 kc mark, and gang condenser fully meshed. The indicator has a spring clip for attachment to the cable.

ADJUST SWITCH TO TRIP WHEN NEEDLE IS ON I-3/4 RADIUS FROM Q, OF MOTOR SPINDLE

Figure 14-Adjustment of Automatic Stop Switch

o BOT TOM

OF PICKUP

Figure 15-Pickup Connections

BLUE



RCA PAGE 9-205

MODELS 910KG,U126,U128 Tuner Mechanisri,Data



206 RCA EDDELS 910KG,U126,U128 Parts List

RCA MFG. CO., INC.

REPLACEMENT PARTS wig 00 gamine factory-btWd pub, which we readily identified and may be purchased from eudlodfed dealers

6TNá6 DESCRIPTION Lbt Prio

STOCKUnit No. DESCRIPTION List

Price

RECEIVER ASSEMBLIES 11611 Cagdwr-25 old. (C34) (Model 91060). 1.66 Beane[-Varinple denser mat rotor diet- rent baring -los bracket and cup assembly

31237 Clutch -Venable condoner drive gear clutch and r.onl pin on motor ahYt-60.

31963 (Yoh. U-184 and U-198) .10

Bard -Antenna d terminal board 11844

80

Clutch --Variable em done [eat clutch and .56

[round (Model 910KG) .25 Diyyncci, {earngs{e Din on maw shaft -º6

42 71531 Board -Antenna d ground lemons) board (Modal U-126 and 111118) .25

31 13 11414

Coe...0 and .túen3 ail (L5, Le, L7). .. Coil -"A" band wcilleor coil (LI7)

1.30 1.06 11949 Bally-9tnion.seltieg contact body, lee cooact

and 31494 Coil -"B" band antenna coil c L3. LA) '1

.80 31978 Bracket-B a dap echoer mounting bracket corn-

.38 31286 Coil -"B.. ab "C" hand mediator (Lib. .t6

31451

plue -.n indicator strip, cord, and tewion

Bracket -Bracket and bearing cup for variable condemner

tU-oIIs rotor adjustment (Models

s a

motor

31217 31180

31281

Call -"C" bend antenna coil (LI, LI) Conde -3-4 nser

C7, Cl, C32) { r`,,able condenser (CO. Cl.

Conlin -Contact tip for rt .ettica ccetacl. itcht`co

.90

4.50 .04

31!44 1º714

Br5-111 .45 E Caprite-Adjusúkk trimmer

bracket (CM)) L6ó

Ca Dual adjustable trimmer 3-30 nodal I

31316

3131[

Conan -Polo buttons omprir m{ 10 contacts sÁ on insulate{ nnpria

Conran -cosh button switch contMega strip..- in{ I9 riveted on inrulat.{ ,,rip...

.70

1.90

11894 each b aec-on (1b, 125). A. (mer 6.80 rmfd. (Cb) .Q5 Gpwtor-15 .em 31171

31º51

,odic Cord -Banc indicator

pointer mod

Cord -I cord 10 .60

11948 d.

Capacitor -33 reed. (Cl,C1 161). .35 311184 sciable de,,dove

Core-Adjsla acornter drum mirs coed.... .QO 11441 11057

CGenerator-36 mid. (C1) .10 Capaeitor-4l amid. (C57) .10

81º14 core and mud (oc 1-1 tour C Moors 15 13067 *pal C -!t ment*. (167) (YodW U146 and 31910 Core-.ccp ck. arc and stud ter "A" band

cod 19720 31170

Cap to, 100 ale. (CYO) .35 Capacitor -100 amid. (C11, C19 Cll. C14) .35

31273 31240

Drum-R`Indicator driva cord drum Fl0,1cr« Variable condoner drive meter 91-

.BO

12724 19746

Cm..., of -110 mord. (CIA Cot) .36 Capacitor -150 meld. (C15) .84' 13!39 Gear-`tVandle condenser knob..baft drive gear

.46

310033 31406

Capacitor-060 eppaaimr-1 S00mneed.( ((C28) .35 Cagmor-6,000

need. (C31) .75

71646 Ger -Variable hub

condenser .se mod.. dyer gene and > eel -9á cycle nodeia only

.48

.40 5107 C -.00Yb mid, (114) (Modes U-114,

pacitor-.0896 33151 inyclNiod dora {ear Gear -pinion

gear -60-110 Modal na pinion tar--cator .50 34828 4828

C red. (174) .16 Capacitor -.515 mad. 177, 149, 15.25 .15

31531 31639

101..) Indicator -Band Indicator step (Model 5.12) Indicator -Band tndlanr strip (Node. U -lß4

.18

4858 c tadaor mid. cdº1. cu) (Yohb D-I9s d U-1221 .25 11491

U-1Band

Lendp-acne lust seep. 4.7 V. .16

14393 Capacitor-Al 1065) (C9Ì, CC48, CC6t C39, i. Model 71410

or oemDartmant

Lamp -Electric Electric tuning adjustment indicator lamp, .I7

810K0 only) (C65 m Mods. U.124 and 8.9 V. 0.18 amp .24

11315 5.118only)15 .10

Capacitor -.016 ((1)6) .10 31344 33344

Leather bast lather fer kywhel Lock -Pugh button ...itch lock vv.te-camprb-

.04

1483º 4839 30947

Capacitor old. .20 Cape -do -0.1 ami.d. CIO, C) .90 Capacitor --1.98 (4317 .30

31241 oto 10 contact leks m one Api

mnlyr drive motor (YI) Motor -Variable eyrie -25 >d< rndeb only

.80

4.60 30847 Capacitor -0.2e ofd. (C19) .30 11£36 c dk drive motor (MI) N-50.40 30147 5239

Capacitor -0.5 mid. (319) .30 -18 id. (Ceo) (Model 8U.124)e 1.36

cycle cycle

contact late

Plate-]<Intar cortan p lee e

7.66 6

31886 01,0, Car -Viz -In idd. (136) (4184 U -1H and

U -troc 1.25 91017 Plate -Selector mounting pinte-mDuna ce rear

r2.cctt .50 31785 Ca 90 old, 11947 (Mode. U.IQI and

U-149) 1.78 30181

c kneer Plcabl. 0-336 plue loi phew. motor

cable (Mode. U-148 and U-194) .36

5040 Plu{-4coneact lesede plat for speaker cabin MOTORBOARD ASSEMBLIES

12493 (Yodel 81060)

Pluge-5-contact fem. plug weaker .30 Model U-194

91210 Pulley -Indicator Uneb pointer U.128)ocord

paney ue1e 'A0 .10 31530 9848

Coupling -Flexible motor coupling complete.. Cup -Used ncdle cup and lid complete

2.18 .76

31271 31272

Pulley -Motor 00547 Pulley --Rage evich pulley

.25

.20 31485 31695

Mounting-Ptckur nove bun rubber ,counting.. Pin -Dove pm e luten fleible coupling . .10

91250 Resritor-Vohage divider comprising one L600 turntable 'haft .03 Ohm, one 2,960 ohm, one 9,, 00 hm, one 12 ohm, d one 140 ohm ructions (RI., R118.

30370 Plug-Acontect male plu[ for autematle swatch .16

14117 R31, R92, R33).

Rancor -º2,000 ohms, 1 10 watt (844) .90 n1á

14196 30100

Screw --Set screw for flexible ceuplieib S0tieg3--1 A miring. for automatic sait

.05 .08

13991 Rutor-99000 ohms, 1 watt (R4) a .20 31156 Sprier[-Ued needle cup cornon .D tton ring .04 11300 12804

Resistor -99,000 ohms, 1'I watt (R97, 8304 Renter -39,000 ohm, I watt (R8)

.15

.90 31177 Strip--CempMe set el rubber eri. ter 8.x,0

>> ggrn 10 17040 12281

Rektor -omit 0 o050544. I watt (11554 R ohm., I watt (R5, RSV 849)

.90 31594 31187

So ire. utwrnc ...Mob and leva complete.. Sriteh-Swneh only ter automatic switch (271"

9.76 .36

11913

0 1220.000 ¡0491 Models U-116 and U.128 only)

Reuter -110.000 ohm, 1,10 watt (R11) .20 .15

31633 Turntable -Turntable with rpindie .haft and sana complete 3.96

11489 11459

Resistor -170,000 ohm, 1/10 watt (818. R99) Reuter -470,000 ohm, 1,/10 watt (R1)

.16

.16 31837 Webers -Tamable bearing end .him washers. A.

122116 12013

Ra.ar-179000 ohms. I wartt (R4) Rouer -1 me 1/10 watt (R7, R26)

.10 .16

MOTO R B OAR ASSEMBLIES Yodel U-1111

30208 T.,

Reenter -1.9a., 4 w (522. R41) (1141 111149 Ber -Tone arm mounting base .36 11981

Model. U-196 and U-1111 only) Reinter --1.5 et., 1/10 watt (Rd Ó) (Models

`

.90 3116º Board -Record changer bane ' h all welded and riveted men and bearings -Ira

5131 U-129 and U-128 only)

Reimer -2.1 reg, w (R3 `drive

.16

.15 14209 elf or-Malg parts

Bumper -Mate lever rubber bumper (I) 7.00

14847

31933

Re sett -Indicator pointer lord pulleyretainer

Rot r-Sakater rotor din -mount on rear d .01 14{1 Cup-Ued efts cup, r and lid cwvpka..

Bacuechwn-index real,

.06

.75 40

variable condenser Wet L48 31161 Guide -Pickup lift cable (coil .Doe[. cor gin. tarie) (9) .30 31141 Seatfor

ñee10 beadle., cone pint eat screw

yr 0º x1150 Mounting -Pickup arm bane rubber. mounting omplete .45 4119 Screw -Ne 8-34 beadles et screw fou gem

Stock No. 91239 .04 31106 Sprtn{ Needle cap lid tension rprioa .01

14960 Screw -No. 8-32 square head set *crew for elector roof disc .03 0PERATI NO MECHANISM

4849 Sc . 8-3 w fo more head set nerer pulley Stock Nos. 311 271 and 31479 and drum Stock 31134

Mode U-191

Bracket -Pickup locating Mae mounting bracket

31364 Nn. 31273

Socket -Dial lamp neck« .03 .40 31144 Cam-CamS and [ear aeembls (4) 9.66

13471 31347

Socket -Magic Eye socket Socket -Pickup socket and bracket

.45

.30 6801

91148 Clutch -Trip lever friction clutch namely (5) Coupling -Motor coupleº complete with tune

.16

31151 31345

Socket -Tube socket Socket -Tuning indicator lamp in.ulated seem

.20

.30 table drive gear, rubber ripe. ,ewer coupling, .rid drive (6) 1.80

91979 31232

Spring -Band indicator tension ap,,ea Spring -Contact rip spring for.tatemaetiea

.03 í1)ße alll9

Corerap for rip of retord pat Finger -Trap lever friction Niger by (7)

.16

.45 come .01 91119 G recd arm d rick gear for front Idt-

rd taud)rack 1513f Spring-Indoeer pointer drive cord tension

.08 31120

Gar arm gear for rear right -

hand record pot (9) .66 31411 Spring --Variable condenser drive cord tension

pru,t . .06 31121 31123

Ger -Record poet gear (10) Guide--Main Piing guide (11)

.99

.40 11007 Spring -Retaining non. tor core Steak Ne.

91989 . .02 31114 31197

Lever -Index lever ably (12) Lever -Index lever tension spring lever (lf)

.76

.30 31190 31282

Spring-gmion-caning cota°, body wring. Spring -Toulon .prinº for core Stock No.31080

At .01

31190 93113

Lever -Locating lever and pawl elembly (14) Lever -Main aaumblY (16)

lever Lumbl

.70 1.36

31941 Sprang -Tension spring for Byrheel .01 91310 yylever R(16)

alt cable and .Driet LL .55

31319 Sp` barns

ion spring for push button switch lamb

31135 31190

Lever -Pickup locating lever pt (I7).. Lever -Record sepeear elevating Mae monk.

.96

31494 Spring-Vanablv condemner meter rotor adjunt. ment bearing wring for 26 mode. only 31131

with adjustment screen (18) Laver -Trip detaining lever (I8

.10

.30

31109

cycle (Models U-128 and U-120 nly)

Spring -Variable dour motor rotor adjust- .01 31116

31131 Lever -Trip lever ably (10 Leer -Trip regulator lever (41

1.66 .16

Dearing npring fou 60.80 cycle model. only (Mode. U-146 and U-111 only) .02

31133 31144

Pawl -Trip pawl auembly (19) Pin -Record pot drive pi (83)

.80

.04 91º38 Support -Variable co dorer drive tear mount-

mg supin,, and stnm esembTo .66 14407 Roller-Pickuplift cable roller and bracket »-

one .aa

91245 Support -Variable denser e mounting rid um ter

05 on y VV ender I

91114

4503

Screw -Cone Cbly pointed moo rnr.tep lever se hub o record pa Mel

Se Pickup lilt ctabl a5044. .04 .04

31490

decycle (tlod 1 B)OKG ly)

Support -Variable condenser motmounting for moel.

.70 14105 9110

Screw -Setscrew lot flexible coupling Screw-Spec scree to edit friction dutch

r`

.06

25 cycle oly support e vet (Mode. U.I26 d U-124 only) .00 81124 Separator -Record anteater knife O.)

.09

.75 31.4 Support -Variable c ,,denser motor mounting pied and mum lus 50-99 cyme modela Drily

91129 91115

Shaft -Record separator pot eel (46) Shelf -Record post .held eembly (17)

.40 1.46

91488 (Model eIOKG only)

Support -Variable c dorer Dr mounting .45 31141

9676 Spindle --Turntable spindle .haft and spring Spring -Cam Owl t i or4n/ n ' goer

1.40

support end studs .r 50-80 cycle mode. only (Models U-118 and U-129 only) .35 14190

(DI turns, .190 -in. O.D., 4]/44Án..-) Spring -Pickup locating lever short gyring or

.04

91980

31291

Switch -Pickup twit. fer mounting on push button switch

(Sr,(33)

un

Switch -Range switch ( 32) 2.70 .95 31145

locating lever pawl tension spring (98) (16 sic. 14.) s, 160 -in. O.D.,

tension Springs -Main lever e on Drin[ (99) (18 .08

91312 Switch -Station selector push Mimi. switch and bracket complete 9.25 31136

turns, 9/16 -in. O.D,n 3 -in. 1[.) Spring -Pickup locating lever ton[ nPrioli or

.05

91278 Tone Control -N .f. tone control and power witch (R12, .1) 1.50

,rima lev« acne n *Drin{ (JO) (ßb turne, .190 -in. O.D., 15/18 -in. Igo.,, .06

91187 Transformer -Fire i-1 transformer (Lx, Le, Cil. 132) 1.11

9088 Spring -Pickup lift cable tm goring (31) (20 , 115 -in. ó.D., lm. 4-), .04

01281 Transformer -Second i -f transformer (L10, L11, 319, 114) 1.01

31117 Sprint -Record operator mesure pine{ (14) turn., 1-h,. O.D., kin. Ig) .02

31300 Translormer-Power t anafermer 105'190.140/ 180-100 200 volts. 50.50 cycle (TI)... 13.86

Spring -Trip t et(33){ 15vturns er or butin. .ver i

44

t [ (33) (16 .190-.. O.D

91226

91125

Transformer -newer tran.former 110 volts. 25-

Transfo,,tat cle

TPower transformer 110 volt, 60- 19.00

91332 91147

Spring-lfurntable .pindle spring........ fleaib Se

cou --Complete set o1 rubber ecriq flexible

.09

.40

91450 60 eyrie (Tl)

Volume Control (R9) I Model 910KG only) 9.00 1.50

31139 91124

Turntableg A.aembly-le. .pindle Washer -"C" washer for top of record pent

3.35 .04

3124e Volume Control ( R9) (Mode. U-126 and 0.125 en.) 1.60 31149 Wehen-TumaW thrust washers (1 sleek 1

bronze. 1 felt) .15


Unit List Price

1170] 31448 31383 31157 30889

30870 31447

31168

14204

91489 31155

31448 91150 81141

91161 31166

31159 91]40 91161

19884 11294 114693127576

5099

31539

31530

31691

14594 14357

31358 13103

314e.

31640

31541

91151 91356

91361

30898

31305

31542

91365

31468 91457 51589 31760

aloe. 11010

14270

31470

11131

31426 11428 9916

MOTOR ASSEMBLIES Mode. U -l28, 0.198

Geeemor-Maton *peed Soeemor Motor -106125 vol. 25 cycle (Yº) Moor -1061º5 velu 50-50 cycle (M1) Motor -106-185 volt, 40 cycle (Mº) Plug -2 -contact female plug lot motor Wade

Pluzcs n 98l, açroeplug ter meter poor cable Screw -Complete of or {

e sod spacer -for 05 cycle mounting

Sc weer,

i t { weber., a pacers -for 60-50 cycle models

Sweob-MDAr toggle twitch (S7) (Model 1.1-141 only)

PICKUP AND ARM ASSEMBLIES Model U-146

Base -Pickup arm bee and IMAM et

pivot u Crysl-Pickup crystal ea ridge and needle

meow Pickup and arm complete Screw -Pickup need sorer Shalt-Pkkup pivot arm and shalt e.mnbly

PICKUP AND ARM ASSEMBLIES Model U-123

Cable --Pickup arm lift able and clip Crystal -Pickup emu) cartridge needled ndle Pickup And arm complete Screw --Pickup needle

me Shot -Pickup pivot arm and shaft aesebiP

SPEAKER ASSEMBLIES Cap -Duet cop for a center Coil -Fiert coil (L12) Coil -Neutralising coil (L14) Cone -Speaker cane and vain coil (L13) Plug-4connn male plug fbr apege (Model

91 -KG only Plug -6 -twat plug for apeker (Mdek

U.128 and only) Speaker complete RL70H.4) (Yodel 91045

only)

Speaker complete (RL70H-4) (Modek U-126 and U.1011

Tracdermer only)

-Output put tr analormer (T9) Weher -Sprier[ weber hold field coil more,

MISCELLANEOUS ASSEMBLIES Button -Station selector push button Cap -Pakt Imp cap (Bulb Eye) (Modele U-124

d U-199 only), Cover--8-protective coven for poll button

CushiOT Cbasnia mounting combo and bl,ce-auBùimtcomboter ono clime. (Md.

U-125 and U-126 only) Cushion -Mohr plate mounting cushion and

elm. assembly -sufficient U.mt ion instrument

Dial Stati nModel. lselector ái.14 scale and crptal. Escutcheon -Tuning dial escutcheon -kris dial

and button (Model 910KG only) Eecutchedn-Tuning dial eche es on-1 dial

and button (Models U.12648and U.125 only) Hinge --Cabinet (Mod. hinge (Mod U-126 d

U1211 ceºo

only) katet tndicat0r potnt.e

Indicator -Station nnnlelector

Indicator pointer (ModelsU-lú6 and U ---m 1ºS Iy)

Knob-StationKnob-Stati lector, la control, too con tr I, errrang* ewitch knob

Yorker -"D.1 Tuning.. Dash button marker M -"Record P.1er

ps button rker.me. button

Marker -Station call Serean -Compartmentlamp m re (ºdeb

U.126 d U-165 only) Screen--Dial calm urea &` (4 required) d) (ModelClousta

mounting mrew. and "weber ,010KG

only) - Spun[-Retaining spring' for knob Stock No

31356 .

Supension-Nwor bard suspension apringa, and 1wher (4 required) (Mod.ú8 e and U-125 only)

ºePee-C net lid support (Med. U-1411 and U -124g only)

ANTENNA ASSEMBLIES Counterpoise Line -Additional length CO It. long Insulator -Strain and countermine insulator. Tranemwim Line -Additional Moog. 00 It. 9019

3.06 99.70 14.50 17.75

.36 .35

.40

.95

4.11) 7.60

.1º

.41

.06

4.95 7.45

.19

.46

.03 3.85 .30

1.75

.30

.25

11.96

10.45 3.96 .08

.16

.15

.08

.50

.60

.95

1.85

2.90

.96

.40

.35

.11

.01

.0l

.95

.20

.45

.06

.05

.10

1.85

1.36 .05

1.60

ALL PRICES ARE SUBJECT TO CHANGE OR

WITHDRAWAL WITHOUT NOTICE..

RCA PAGE 9-207

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MODEL 911K Schematic Lead Dress

Y T 3 a d Ñ N

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208 RCA

M0113A .,r

II

RCA MFG. CO., INC.

"Magic Eye" tuning tube; 12 -inch, dust -proof electrodynamic loudspeaker; aural -compensated audio volume control; continuously variable high -frequency tone control; provision for armchair control attachment; new straight-line dial; illuminated band indicator; noise -reducing adjustment on "A" band and noise reduction on "C" band with RCA Victor Master Antenna; air -core trimmer condensers.

One Mazda 47, 6.8 volts, .15 amp; Two Mazda 44, 6.3 volts, .25 amp.

`3ms

AIS

S£3

u

443 053

91 Ña Jf

volts, 50.60 cycles, 120 watts volts, 25.30 cycles, 120 watts volts, 50.60 cycles, 120 watts

£43

12 -inch Electrodynamic 2.2 ohms at 400 cycles

Pier

mo

f2 F

MODEL 911K Chassie Wiring,Thansformer Voltage, Specs.

This receiver employs an eleven -tube, three -band "Magic Brain" superheterodyne circuit, the arrangement of which is shown in the Schematic Circuit Diagram. Features of design include electric tuning for eight broadcast stations; push-pull power outut stage; magnetite -core i -f transformers; magnetite -core "A band oscillator tracking adjustment; temperature -stabilized capacitors; four spreád-bands; automatic volume control; jack and switch for Victrola attachment;

Pilot Lamps

POWER SUPPLY RATINGS Rating A 105.125 Rating B 105-125 Rating C 105.125/140.160/195.250 POWER OUTPUT LOUDSPEAKER Undistorted .. 10 watts Type Maximum 12 watts Voice Coil Impedance

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RCA PAGE 9-209



210 RCA =EL 911K Alignment,Socket Trimmers,Parts

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CORRECT ALIGNMENT The intermediate frequency (I.F.) stage PROCEDURE should be aligned properly as the first step. After the I.F. transformers have been properly adjusted and peaked, the Broadcast Band alignment should be the next procedure.

I.F. ALIGNMENT Adjust the test oscillator to 456 KC and connect the output to the grid of the first

detector tube through a .05 or .1 mfd. condenser. The ground on the test oscillator can be connected to the chassis ground. Align all three I.F. trimmers to peak or maximum reading on the output meter.

BROADCAST BAND Adjust the oscillator to 1730 KC and con - ALIGNMENT nect the output to the antenna lead (Blue) through a".0002 mfd. mica condenser. Set the gang condenser to minimum capacity and adjust the gang condenser trimmer (oscillator) to receive this signal. After this has been carefully done, the next step is to set the generator to 1400 KC and after tuning in the signal adjust the antenna trimmer to peak. This is all that is necessary for the alignment unless the plates of the gang condenser have been bent out of shape. In case of bent plates, set the test oscillator and the receiver to 600 KC and bend the plates into the position for maximum sensitivity over the tuning range.` MF 50 M . (MODEL 551

SWITCH VOLUME CONTROL

MODEL 4A Schematic ,Socket ir immer s,Alignmen

1C5G

clo a

111111#111#11.--44,-

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SPEAKER SOCKET

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2 RADIO PROD.. MODEL Z4 Chassis Schematic,Socket Tr immer s ,A1 ignment

/C6 MIXER

1

SWITCH SHOWN

BROADCAST POS. 456 KC 1.F

6VOLT + STORAGE BRT TER Y

RADIO PRODUCTS CORP.

VleRATOR UNIT

CONY'.?'TIONAL ALIGMENT -

SEE SPECIAL SECTION VOL. VII

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N(,3TN07-EV$E0

IMPORTi9NT DO NOT REMOVE TVBES WHILE SET IS OPERAT/NG

FREQUENCY RANGES - BROADCAST -540 to 1700 KC, Peak gang oondenser OSC trimmer then gang condenser RF trimmer to maximum on 1400 KC. Pad Oscillator at 600 KC. SHORTIÍ;AVE -Peak Osc and RF trimmers to 14000 KC, oh©ok for weaker image frequency at 13100 KC. No padding required. POLICE - Adjust antenna coil trimmer to 4000 KC. No padding.



xAI)Io I'ROD. l'AG1'. 9-3

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CORRECT ALIGNMENT PROCEDURE

/5000 2 57.000 ! /5000 4 2000000 S /000000 i 9000 000 7 200000 e Soo 000

TOWS ATTS

vox. CwVT.

9 /60 METAL p 33 CLAD ¿I /60 REarrse2

T h e intermediate fre- q u e n c y (I.F.) stage should be aligned prop-

erly as the first step. After the I.F. transformers have been properly adjusted and peaked, the Broadcast Band alignment should be the next procedure. I.F. ALIGNMENT Adjust the test oscillator

to 456 KC and connect the output to the grid of the first detector tube (6A7) through a .05 or .1 mfd. condenser. The ground on the test oscillator can be connected to the chassis ground. Align all three I.F. trimmers to peak or maximum reading on the output meter.

BROADCAST BAND Adjust the oscillator to ALIGNMENT 1730 KC and connect

the output to the antenna lead (Blue) through a .0002 mfd. mica condenser. Set the gang condenser to minimum capacity and adjust the gang condenser trimmer (oscillator) to receive this signal. After this has been carefully done, the next step is to set the generator to 1400 KC and after tuning in the signal adjust the antenna trimmer to peak. This is all that is necessary for the alignment unless the plates of the gang condenser have been bent out of shape. In case of bent plates, set the test oscillator and the receiver to 600 KC and bend the plates into the position for maximum output. PROCEDURE FOR SETTING UP AND OPERATING

AUTOMATIC PUSH BUTTONS

Select four strong local stations tuned in regularly. Now loosen Locking Screw (see chassis layout) several turns with a coin or a screw driver and press in any one of the four push buttons. Holding the button down, tune in any one of four selected stations by rotating the tuning knob (side knob) slowly back and forth until the signal is cleared.

Release the push button and press in another button and hold down, tuning in another favorite station with tuning knob. Follow the same procedure for the remaining stations. Now hold tuning knob (side knob) securely and with coin or screw driver, tighten locking screw. This screw holds all stations in adjustment. In order to change any station already set up, to another, hold tuning knob securely, loosen locking

5Y3G RECT/f/ER

R.V 0000

9

Rro R//

MODEL 5A

Five Tube A.C. Superheterodyne 535 to 1735 kilocycles

`ie single band.

Ir lam. 1111111111111

screw and select the new station as explained above. Tear the correct station call letter tabs from the set of sheets supplied and push them into rectangular windows above each push button.

The automatic push button dial is now set up for quick tuning.

m >


l'AGE 9-4 RADIO PROD. L3DDEL 5C LEDDEL 5CPH Schematics,Socket Trimmer s ,A1 ignment


MODEL 5C - 5 TUBE T.R.F. AC (60 CYCLES) OR DC AT 105 - 125 VOLTS.

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RADIO PROD. PAGE 9-5

RAI)IO PRODUCTS CORP. 1eDDEL 5E Schematic ,Socket Tr immer s ,Alignment

Cl

FOR ALIGNMENT PROCEDURE SEE MODEL 4A. 6A8 6KT 6 Q T 25L6 MIXER I.F. DET. .ter MID. POWER OUTPUT

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6L 7

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FREQUENCY RANGES - BROADCAST -540 to 1700 KC - Adjust OSC RF and ANT trimmers on gang condenser to a maximum peak of 1400 KC, then pad the OSC circuit at 600 KC while rocking gang condenser. SHORTWAVE -5800 to 15200 KC - Adjust OSC and ANT trimmers to a maximum peak of 14000 KC., no other adjustments. POLICE - 1700 to 5000 KC - Adjust the RF ANT trimmer on coil to resonance at 4000 KC, no other adjustments.



RADIO PROD. PAGE 9-7 /JODEL 6D

DEL 7A RADIO PRODUC'T'S CORP. Schematic ,Socket Alignment Tr inner s,Alignorent

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Seven Tube Combination 6 Volt Battery and 110-120 Volt AC 60 Cycle Dual Wave Superheterodyne

ALIGNMENT: FOLLOW PROCEDURE OF MODEL 6D,

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RIS

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2 .05 Mid. 200 V. 15 ,05 400 V.

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!O 250 n .. 23 0l 000V, 11 .01 Mid. 400V. 24 .5 10v. 12 .1 - 200V. AS . / .. 200v 13 .S . 200V. i 011. TYPE

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(VOL. CONT)

2 /0 % TONY CONT)

TUNING KNOB

TVOLUME CONTROL

ON S OFF

B TONE

6 VOLT »ATT16V COILS

3 j 24 2 to Y

SAND SWITCH IN BROADCAST POSITION' POWER SWITCH IN BATTERY POSITION. I F. - 456 H. C. O C26 TO C29, 2-20 ,,.f TRIMMERS.

SCHEMATIC DIAGRAM MODEL TA

SWITCH CONTROL

6L5G

¿ES S. F. TRIMMERS

ti SW

oli

v e v

ELECTROLYTIC CONDENSER

zM4 Z. F. TRIMMERS

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6G 6G

SPEAKER SOCKET

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1

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VIBRATOR L_-_ -_ _ - - _T -- I 1

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POWER SWITCH (S/06 OF CAN)

CAOCKW/SE POR BATTERY COVNTER.CIECITw/JE FOR A.0



RADI0 PROD. P.1G1. 9-9

CIO

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Seven Tube AC Automatic Tuning 6A 7 6D6 75 41

N IF PEAK

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1MEL 7G Schematic ,Socket Tr ir.nner s,A1 ignat ent Tuner Data

C/, 1I/1 456 KC

cll f 80 1000A SNtP.

114 RS RO RT 1313 R9 RIO RII Ris

fLO. R13 RI4

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CAPAC I TOR At Mf09 7___X/24_

a/5 .005 ssou R/3 Cl .0001 MICA ClC22

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SCHEMATIC DIAGRAM Cl :ó° (sÓ`TGR)i óv.

MODEL 7G Cl .0022 400 C9 .00025 MICA

GO .Ol 400 y. 013 /0.0 (ELLCT) 350V This receiver is designed to operate C12 10 (ELICT) 350V.

r :IH over two tuning ranges: from 545 CK 00045 75%600

to 1720 kc and from 5800 to C/S 0015 MICA CI6 .0001 MICA

f 1,f 1,6 It 003 ! 5 MICA

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'AGE 9-10 RADIO PROD.

MODEL 55 Auto Sehematiu,Socket Tr immer s , Tuner

RA1DIO PR011i'C'I'S CORP.

For 5 Tube Under Dash Automatic Push Button Tuning Automobile Radio

6K7 6076 I.F. AMP. DIO. RECT-AUD. AMP.

6A a CONVERTER

AN CONDENSER -^nnrm.J R1

.

I

1 Ei

2 . ZOON T1t/0o i

Pi! CAP- TPE VOLTS ,o--

2 .0001 MICA 3 .0.5 400v RE3I3TO R3 I

4 .00025 MICA NI OHMS 5 .01 400 V I 50,000 X. N ' y'

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.1 200 V. 4 (YN) 60 i2

.O/ 400V. 3 300.00 V.C. 10 .25 120 V. 6 2,000,00 14

/I .00 /600V. 7 (ww) t0 72 12 .5 120V 200,000 '/, /3 .3 120V. 9 500.000 '/. 14 ó . }ELECT 400 IO /00,000 X /B e. W.V. II /00 l'2

12 10 0 '/2

C ONO EN$ER8

C/2T ~ II cl3

IF PEAK .156 KC

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© John F. Rider, Publisher www.americanradiohistory.com

REMLER PAGE 9-1

Schematic s,tioltage Alignment

ANT 8[uF 1, 640

Line 25A6. 2ntt 813, 6\7, 6.7?

1cf Volts E4 D-

22.2s.-317.14,;£5_

:w signal, full volume.

From nogativ_ of p'ato supply to

ems ploLe 100 5Ag szroc:: 60 C.19 oS,i. plate SAC .etheùe 6}, riele 61'7 snree:. 6S', cm.^ne i.T7 plite ....? aCrlie:.

C77 cnt::cde E5AC .1..h6 seinen 25.1t erid btas ecppl

AMT

100 3

100 100

3

40 1 3

93 100 15

,''d lit` 1000 c..:, p.r voli meter

A. C. VOLTAGES

Line Filament.:

6A8, 6X7. 60. 5.64

D. C. VOLTAGES No signal,

From ground to:

6A8 Plate BA8 Screen 648 Osc. Plate 6A8 Cathode 6X7 Plate 6X7 Screen 6K7 Cathode 6.7? Plate 6Q? Cathode 675 Plate 67'8 Screen 6F6 Grid Biqa

REMLER COMPANY, LTD.

24'48

MODEL 28 "Scottie" Above Ser.77039 l'/rDEL 46 "Scottie" Sere98515 to 107767

4 S 6

/e

rood 0.", 000 25000 £ 5000 100.-00 /teO.n 2£e... S 00000 $00000 / roa,.

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.77044 TU1E5

777e LAB - Sonverter ' 67.7 - L.Y. A:.plltter 110-125 VOLTS AC -DC WS - 'etector ' 25A6 Nobler simplifier pentode

SEE SERVICE DATA BELOW. 2 v3 1"".ter 46 - Dill lanp.

ser eel 6Fi

TUBES:

Type 6A8 Converter 6K7 I.F. Amplifier 60 Dei. AVC. Atn,:llfie. 676 Power Amplifier Pentane

" 524 Rectifier " 46 Jlal Lamp

120 volts

676 6 5

240 volt. 125 125 4.2 E40 125 4.2 100 1.8 230 140 18

Vintages reed with 1000 -Ohm per volt meter.

,2422/ Tr

IF PEAK 450 KC. MODEL 46

a a 4 ! 7 e 0 /0 =3

C O/rDE71'SERS ,001 II/Gf.

.0r

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wCc//YN7/Yt 5E,i4t W.. 985/S The receiver Le designed for operation froc an alternating current (A.C.) power supply of 110-125 volta. 50 or 60 cycle..

SERVICE DATA MODELS 28 & 46 The anten..a R.F. coil is located over the variable condenser and is trimmed by ':he 'a, -ter on the rear section of the variable condenser. The oncilletcr rc,7i is mounted under the chacdle and i trimmed by the front trimmer lactic... The I.F. transformers and trimmers are mounted under the ohaul,. The I.F. frequency ta 450 K.C.


2 REMLER IuDDEL 46 "Sc ottie tt

Above Sere1G7767 MODEL 47 '1iV'arldvdde

Above Ser.92942 Olw. 6A8

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Line Filaments:

648, 6K7, 524

p. C. VCLTAGSS No signel,

rom ground to:

120 oO1l.J

50, 6F6 6

5

648 Plate 6A8 Screen GAS Oac. Plate 6A8 Biaa supply 6K7 Plate 627 3creeri 6K7 Bias supply 2 60.7 ?late 270

6Ç7 Biae Supply 616 Plate 230 6Y6 Screen 240 6F6 Grid Blas 18

240 volts 125 125 "

2 240 125

REMLER COMPANY, LTD. Scherratics,4oltage,

Scottie"

6147 507 , 6r6

-4" OIAi. UTe 110-125 volts, 50 or 60 oyolea.

IF PEAK 450 KC.

MODEL 48 64.imei.e, 5..41 Na 107 767

7olta;les reed with 1000-01mm per volt aw.er.

640 /De>~ Osc.

r2"

Ac TOLMa0t5

Line -120 volts 6A8, 607, 647 and 616 fller,sat.- 6

.,2 - - - - - - - - - - - - - 5 "

DC V01.:&.:3v

I'rcn ohrseis Lo:

6A8 plate 240 volts 6.0 Soreaa 110 618 Oscillet3r .1at 110 6.48 Cetnol. 4.5 617 Pla,.e 240 EX7 torse., 110 61. Cathode 4.5 647 Piet. 76

647 Cathode 1.5 "

6F5 Plate 2E5 6f6 Soreaa 540 -

6?6 Grid Olas 15.5

110-126 volta.

Voltage somas field 120 volts

Voltegoe reed with 1000 onm per volt meter.

O/Al 4/Ye

50 or 60 oralea.

IF PEAK 450 KC.

IfOD£L 47 B ey/nni 3er,e, No 92942

Alignnent

e 1 e:a V t.'.3e O aQ

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0,44.0 eww

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O

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RESISTORS COn0ENefR`r- I 25 Ohm& '13 .00007 M1d 2 400 14 .0004 3 I,3000 IS .0005 4 25000 16 .001 5 IOonOo 17 ,01 6 2SOoo0 18 .01 7 250000 19 .05 e 300000 20 .05 9 3r7cg. 21 .05 10 I M.y. 22 .0.' 11 1 May. 23 14 11 2 -TI .y. e4 4

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1 150 Cho' 113 .000C25 ed. 2 110 , 14 .00057 3 cri 16 .0506 4 15,000 ' 16 .0005 á 100,00O3 r

17 .001 6 100,000 18 .01

7 150,000 19 .01 8 250,000 20 .01

9 500,000 ' M. .05

10 5t'0,000 22. .05

11 500,0('0 23 .0e 12 1 Y.R. 14 .26

25 4

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REIII.RR PAGE 9-3


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MODEL 49 Schematic

! NO. CONDENSERS NO. RES/570,45 / .0005 MFO. 9 400 .f!- / WATT 2 .0S MFO. /0 //.0001-1.57-0#7200 .3 .0/ Miro. 600 V // 5-0.000 SL 4 .0/ MFD. 600 V. /2 250.000 SZ

S . / MFD. 200 V. /3 500. 00011 6 . / /NF -0. 200i! /4 2 /Y/EG 7 B.MFO. 6 4. /1lFD.

2101 BRTANT ST.

R ^EMLER 1 -Tu 5.NE,AN7.5..2,C.In

C/PCU/T O/AGRAM 41040E L. 49 StIi3JE0T MATERIAL

FINISH (.All 9-27-38 >in. 4EquIREo . , .. .t nir SCALE :-..uv, ,SL 11E0 BY

CRANN BY M./3. ,^,HFCrIG Br AVPkOVEn H.

MOD. 49 DWG. No.



AGE 9-4 REMLER /JODEL 61

Beg.Ser.113701 MODEL 65 Beg.Ser.109217

6A7

= 3

VDL1..C2 h4AI;..s E92 sERrct won

A.C. Vol:agea: Line +'.eeter Rectifier Other hanter

120 volts 6

6

D.C. 7oltage,: signal. From ground ío:- 80 Rectifier filament 225 42 Plate 245 42 Screen 255 42 91ae supply 21

C.:6 Plate .:0

ó 5uree''. IC 41.o 91ns rn;,1. 2.5 oK7 Pinte 255 027 3r.reu 120 627 etas eu,,,.ly 1.5 3.17 2entota ?late 255 617 0.:i'.ìatar Plate 121 '.5,7 Se, -sen 1,2C

:A7 114e el,J)1' 2.5

667 - Pentsgrtd Converter 627 - T.F. Amplifier 76 - JSode detector . Da - Audio amplifier 42 - Toner amplifier 30 - teotltter

- Tp o 48 d181 lane.

SCUP

s,roR /

2 3'3 7 '3noo

25000 C0000 /40000 r 2,44300C

e t4,,0000 p 500000

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ar

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4 8 I O ZS Y

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00

Scherlatics,Vol+age

Al ignment,Tuter

TF PEAK 450 KO.

MODEL 61

E.14,,.^1 5. ho.113 701

The receiver is adjusted for eels" rt ng fire ata'iona ty c^ar.s of the push- buttons. Call letters of these e., a cne nTe lccicoted on OF.. button's. To

receive these station., tut,. on ;he set se de.:ribeu jr. the above i..r_Gruph ano

depress the button oorrespondlnb to the desired etutiot. .,4Iuat volura to

intenslty required.

The knob on th.. right io the tone contrcl. ¿hen tut neo to ton left, 51,4

higher audio frequencies are upprssaed.

Directions for ehenglug the push-hutton station set-up are attached to the

bottom of the eabloet. A ah.et of ,,a.¿-bcttnn call lettera is furnished with the set. The call letter dleca may be removed from the buttons with a pen knife. sod other diane presses ln.

76

From growl to:- VOLTA6g P2ADTWG5 FOR eavICE itORT FOLLOW,

60 R.otifiel fllaaene 520 Volts 676 Plate 250 6F8 Screen 6F6 Bias supply 75 plate 627 Plate 627 ,.preen 621 Bias 676 Plate 67.6 Coreen 606 Ries 76 Plat. 605 Plate 615 81..

245 1D

ils 245 95

2.5 245 95

2.5 150 245 2.5

Readings taken with 1000 ohm per volt meter.

PILOT' LYr2s A.C. Voltages:

Line Rester 60 Rectifier Other heaters

6D6 - Converter 76 - Oscillator 6F7 - I.F. Amplifier 75 - L'iode -Triode detector 42 - ponr Amplifier 635 - Tu414/ Indicator 80 - Rectifier

'Me 46 6-8 volt dial lampa.

120 Volta 4.6 s.s

TTiC.+en

, y ns

IF PEAK 450 RC.

t/ODC1 6S

deFr'ww:or ase.:/ /Yo. /092/7

RESISTORS

2 a 4 s 6 7 d 9

JO J1

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}ZF.M1.E13 PAGE 9-5

REFILER COMPANY, LTD.

SKRPI02 DATA

The following tubes are iced In this reoaiver.

1 6X7 A.P. amplifier 1 6L1 Miler 1 6i6 Oaoillator 1 6157 I.P. amplifier 1 6X6 Diode Detector 1 IN7 .P. amplifier 2 6,6 Power amplifiers 1 602 Tuning Indloator 1 624 Pull -wave R.otlfler

The A.F. Kiser and Oscillator coil, are located in the square shieldn on the right end of the chassie. Trimmer. for theca circuit. are mounted along the end of the sballi. In the following order from front to rear:- R.P. abort -wave, Mixer abort -ware, Oscillator broadcast, Oscillator medium wave, Oscillator abort -ware. The R.F. brodoaat and the Miser broadcast trimmer are mounted on the band nei tob meetly.

Oscillator pads ere Iodated at the rear of the chnaale. The broadcast pad le Oeareet the end of tee chassis and the medium cave next.

Trim -are for the I.F. transformers ere adjustable that holes in the L.P. transformer shield cane. The L.P. frequesoy 1. 460 S.C.

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MODEL 72

Beg.Ser.104459 Schematic ,Voltage Alignment,Data

D.C. foliage. Prom ground to. -

574 Aactifier 6F6 Piste 6P6 toreen 6F6 Alee supply 6N7 ,.udlo plate 6N7 Plea 6X7 I.F. plate e1C7 I.P. screen 6X7 I.F grid bias 6L7 Kiser plate 6L7 Mixer careen 6L7 Mixer grid bias 6X7 H.F. plate 6X7 R.F. screen 6X7 R.P. grid bias tJ5 Oscillator plate 6^,5 Tuning ludicator plate

Readings taken with 1002 clam per volt meter.

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6 REbILER MODELS 89,89C Beg,Ser,92582 Scheme.tic , ií oltage Alignment,Fhono.

The following tube are need 1n Chia receiver:

607-R.F. Amplifier L7-ASrer

6C5-Cecillctor 6X7 -t.7. Amplifier 6116.Diode Detector 6F6-a.P. Arplifier 6P6 -A.F. Aerlifler SV6G-Beata lower Amplifier 6Y6C.Beem Fewer amplifier bit -Tuning !mitigator 5140 -Rectifier


The 7.F.,liirer and c eolllater rode ere located 1n the large equere Melee en the right end of the chasela. Trimmore for thee, circuit ere mounted alms the end of tee ehaeete,heneath the coil. 1r. the following Order; 0.P. abort.,.., Weer short W974, Occil:ato: broadcast, Oectllatcr medium wave, Oecillstor short wave. From front to rear. The R.F. breadeaet end Mirer broadcast trltmere are mountud or. t'ta range switch arse.-.bly, eeclllator pade ere located It the beet of the variable eondeneer. The pad nearest the end of the chaeele te for the broadcast band end the medium way. le next..

?Ader. for the I.E. transformers are ed)uetable thru holle In the S.F. trar.s-

forrer shield cans. Tho I.F. freeueney te 460 I,C.

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120 Volts 48 '

6

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5i41 ñecttfler Filament 2h0 Volta 6'{65 Plate 224,,

60(2 Screens 260 -

sveC Pies 16.C.' t°1 Plated 60

6FE Pine 1.1

bd7 i.i. Plate 210

60 1,1. Screen 100 "

't7 T.F. 51ee 3 "

607 Flote 260

6L7 ernen 100

61.7 Flet 3 61! Plate 1E0

057 A.F. Plate 260

657 . Screen 10h 607 R.F. Et am 3

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