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COLOR CODE Changes on this chassis have been made on several different

occasions and to distinguish how one chassis differs from another, an identification mark is placed on each one changed. This identification mark is a dot of paint found on the end rivet of the tube socket strip.

Looking at the chassis from the back the mark is at the extreme left of the 226 tube socket

If the chassis has no mark it is understood that it is an early set.

Yellow Mark

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1. A "dual volume control" in place of the single type. The new volume control is mdde in two sections, with five lugs. The section nearest the chassis, having two lugs, operates exactly the same as the single volume control. The section behind the first, having three lugs, is placed in the first audio circuit -to reduce the audio amplification and operates in tandem with the antenna volume control.

2. An interchange of position of the two audio transformers The re -arrangement of the audio transformers has not altered their connections in the circuit.

3. An addition of a "dual half microfarad condenser" and two carbon resistors in the "B" circuit of the detector and first audio tubes. The 40,000 ohm black resistor with one section of the dual condenser is pieced in the detector circuit (224) and the 15,000 ohm blue resistor with the other section of the dual condenser is placed in the first audio circuit (%26). You will note that the yellow and blue leads in the cable connecting to the terminal strip have been interchanged.

4. A change in the location of the grounding of No. 1 lug on the condenser block. This lug is now grounded to the condenser case with a short piece of bare wire.

Red Mark All chassis having a red mark on the rivet (Serial Number of the tube socket strip have all of the

changes mentioned above and in addition, 39,000-42,999) have a one -tenth microfarad condenser

connected from ground to one side of the 110 volt line A peculiarity that may be ex- perienced by the addition of this condenser is a loud hum on every station tuned in only when the antenna wire coming from the set is connected to ground. This can be eliminated by re- versing the plug in the socket. Also be sure your antenna is not grounded, either by some other set being connected to ycir aerial or through any other means.

Green Mark All Chassis with a green mark on the rivet of the tube socket strip contain the above changes and in addition have a change in

43,000 and up) the "combination phonograph switch" circuit. This changed circuit makes "se

of only the audio system of the set for phonograph reproduction. whereas the original circuit included the detector tube

The Phonograph, Radio, On, and Off positions of the switch are the saine as in the early sets. To obtain maxilnum volume and best tone quality a pick-up coupling transk.rmer should be used to match the pick-up used.


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ZENITH PAGE 1-9

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ZENITH PAGE 1-15

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16 ZENITH

MODEL 60,61,62,64,67,602, 613,622,642,672

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18 ZENITH

MODEL 71,72,73,77,712, 722,732,777

Schematic - Voltage Electrical Values

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ZENITH PAGE 1-19

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20 ZENITH

MODEL 80 Hypermetron Sohematio ZENITH RADIO CORP.

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ZENITH PAGE 1-21

.ZENITH RADIO CORP.

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MS -149 Power Choke


22 ZENITH

MODEL 80 Hyperinetron Parts List

22-79 S-829

26-21 S-703

100-18 11-2 80-70

22-81 22-82 22-91 22-92 22-99 S-392

63-113 63-121 63-131 63-136 63-143 63-145 63-146

S-441 S-836 S-837 S-838

20-7 20-8

4-87 126-62 126-59 126-61 MS -153

44-4 78-30 78-31 78-32 57-161 57-242 63-128 63-147 85-26

143-9 117-31

S-695 S-715

52-23 MS -147 MS -148

250M 100M 400 50M 4M

800 2000

ZENITH RADIO CORP.

HYPERMETRON

Variable Condenser Assembly Five Gang Variable Condenser 20.00 Dial Drum Assembly 1.50 Calibrated Dial Strip .20 Dial Lamp Bracket .45 2i Volt Dial Lamp .25 Dial Control Cable .05 Dial Control Cable Tension Spring .01

Fixed Condensers Single .01 mf Condenser (Tone Control Cond.) .85 Single .001 " "(Detector Plate).... .30 Single .03 Audio Coupling).... .50 Single .5 " " (Det. Cathode BypasE .75 Dual .1 " " 2nd RF & Det.Bypass .75 Antennc Series Condenser .10

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ZENITH PAGE 1-23

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Models AH, CH, RH. 90 (1932)

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24 ZENITH

MODELS AE,CH,R1 Parts List Servicing 'Data

ZENITH RADIO CORP.

I-F. ADJUSTMENT

The intermediate transformers employed bddween the 1st detector and I. F. tube and between the I. F. tube and 2nd detector have been accurately peaked to 175 kilocycles on a temperature controlled crystal oscillator before leaving the factory and unless the service man has an oscillator which is accurately calibrated at 175 kilocycles and feels that the intermediates are at fault, their adjustment should never be changed. However, in cases where it is necessary the test oscillator is first set to 175 kilocycles and coupled. to the grid terminal of the first detector through a .00025 mf. fixed series condenser. The ground lead of the test oscillator is connected to the ground post of the receiver. (Indicated at point "A" in figure 2.) For this operation the oscillator tube of the receiver should be removed. Do not connect the test oscillator direct to. grid of the first detector tube without the series condenser being in the grid lead, since by so doing, -the bias resistor will be shorted out. Four adjusting screws are provided under the chassis (see figure 3). These verniers tune the plate circuit of the first detector, grid and plate circuits of the I. F. stage and grid circuit of the 2nd detector. (See wiring diagram.) Beginning at the second detector grid vernier, each adjusting screw is, in turn, set for maximum output. For best results the verniers should be gone over -twice in the same rotation, always keeping the output from the test oscillator at the weakest possible strength.

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