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MATV Made Simple

How to Exorcise City and Suburban Ghosts

It's strange, but while tubes are on the way out-tube-testers are needed more than ever. That'sbecause the home electronic sets today use sophis-ticated tubes in sophisticated circuits-and simpleShorts and Emission tests don't take into accountthe actual operation of the tube. Now B & K offersthe Model 747 Dyna-Jet Solid State 100% DynamicMutual Conductance Tester-thelast tube -tester you'll ever haveto buy. e lollTriodes, nuvistors, tetrodes, U emI1pentodes and all othermulti -element tubes cannow be tested under ACoperating conditions for 100%dynamic mutual conductance.Intermittents, low gain and other tubeproblems that would be obscured in an Uemission test, show up in this tester'sdynamic mutual conductance tests.

A special Dynamic test has been designed into theB & K Model 747 to test high -voltage regulators.This test puts one signal on the regulator grid andanother on the plate-actually operating the tubewith the correct plate current. Too much or toolittle current can either destroy the tube or pro-duce an unreliable reading.

estergolf!l ever

hove to

Diodes, low- and high -voltage rectifiers are testedwith proper voltages and loads to determine theiremission capability.

And, of course, you'll still want to test for shorts,leakage and gassy tubes. The B & K Model 747makes this easy with a one -button "Shorts" test

and a one -button grid -leakage and gastest. And it "quick tests" 82% of the

tubes you'll test. And gives youfunctional pin -straighteners to fit

any tubes you'll ever run into.And to help you predict a tube's

reserve, the 747 has a built-in"Life" test. Filament voltage is re-

duced 10% when the "Life" testswitch is set on.

yi All -in -all, the B & K Model 747 Dyna-Jet Tube-Tester has all the features you've wanted

-all the features you'll ever need in a tube -tester.And it's small, lightweight and very good-looking.

See it at your B & K distributor, and you'll see whyit's the last tube -tester you'll ever have to buy!

Model 747100% Dynamic ConductanceDyna-Jet Tube -Tester Price $249.95

Product ofDYNASCANCORPORATION1801 W. Belle PlaineChicago, Illinois 60613

There is adifference in testequipment -ours works!

. . . for more details circle 101 on Reader Service Card

1

2162

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ELECTRONICTECHNICIAN/DEALER

A2J-CffL"47COMPLETE MANUFACTURER S' CIRCUIT DIAGRAMSAND TECHNICAL INFORMATION FOR 5 NEW SETS

SCHEMATIC NO. SCHEMATIC NO.

AIRLINE 1371 PHILCO-FORD 1372Color TV Models GCI-17821A, 41A, 51A Color TV Chassis 20QT75

EMERSON 1374 RCA SALES CORP 1373TV Chassis T2R2-1A

GENERAL ELECTRIC 1370TV Chassis A-2

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COPYRIGHT 1971 BY ELECTRONIC TECHNICIAN/DEALER 1 EAST FIRST STREET. DULUTH. MINNESOTA 55802

1371AIRLINE

Color TV ModelsGCI-17821A,41A,51A

ELECTRONIC -TWACTel yirTECHNICIAN/DEALER

AUGUST 1971COMPLETE MANUFACTURERS' CIRCUIT DIAGRAMSAND TECHNICAL INFORMATION FOR 5 NEW SETS

UHFIF STRIP

CHANNEL( NOTESVHF TUNER 1006-024300)POSITION-

-1I.ALL RESISTORS ARE 1/2 W, 10% UNLESS

LIA -I-

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SYMBOL DESCRIPTION AIRLINE PART NO.

C117A-80 pf /450v elect ................... 67A15 398C1178 -300/450v elect ...................... 67A15398C117C-20pf /450v elect ...................67A15398C118A-80pf /450v elect ...................... 67415399C11813 -800/450v elect ...................... 67A15399C118C- 1001/450v elect ....................... 67A15399RI31 200M/40M (focus module) resistor 750A871.4R133-VDR resistor ............................ 61846-8R134-thermistor ................................ 61C49-3

R108 -2K, AGC control 75A110-11R110 -3.4M, vert size control 75A96-209123-10n, vert centering control 75A64-37R124-10 rt. hold centering control 75A64.30R132 -15M, focus control 754108.29I39 -250K, bright control 055.071300R140 -500K, color control 055-067300R141 -1.1K. tint control 055.071800R 142-100K, vert hold control 055-072800R143-3500, contrast control 055-0712009I44 -50K, loudness control 055.071600

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COPYRIGHT 1971 BY ELECTRONIC TECHNICIAN/DEALER I EAST FIRST STREET. DULUTH. MINNESOTA 55802

L105 -coil width 94A279-3L 108 -deflection yoke 94A377.1L501 -coil, honz hold 94A351.1T101 -audio output xformer 79A142-11102 -power xformer 80A106.1T103 -pin cushion xformer 79A143.2T104 -Vert output xformer 79A134-2T105-honz output xformer 79A145-2T201-4.5MHz xformer 72A317-47202-4.5MHz discriminator xformer 72A356.1T701-bandpass xformer 12A333-2

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{ 11467 4 TO

N

0145Cie151 .05

1115 114/ 021141 220

1+ C14N3 c121 !01 "551,

(Do)011203

1.21

111

196

t (J.11

CelZ1

1126

1151311

Il

141

COI_ 0 106.4410

3.54

I1/4100,

_151

5%.4

IC91 L100

3.51440-w- 001

C140 =co15 woo

11750 PS

1 I .C2173:

1 I

1 I

1140104

1.415%

151

3.3011

P 5%

T -099 0123 ;it V-.1°1 A1131

71

110

4204

M107540

IMMIX

.11at No.

CONVERGENCE PANEL

/1

M193

0

Ipso0130?

I ;:;,

IR

IM1142

011303

LIMN.ILI

130111302

1.300 VEIT.61

111M181

kVp000

022re.051

.104

400v ,cc4185 II

SINT/.15

weir TOM

1302 1301 1542051 530 100

211" 111

C303 C304

53201

nes2INS

100

111301 C305150

L. 11011 20001/C4

IONM. 4/1 /6

1364

211

._0130430

VERT

kV GP

01304

MgtSr

IR Ulf

as -,z, I

5 115

PAM (T)emanoll

CHROMA & SOUND PANEL10 111,61

501121 12111

5010 .//M194 voles M190 04

151

r. OIFF.

1/6 AMP

11300

100

war

0/TAI.

01114/11%.

1315240

4E12

IIS MT

'UNII

R IRI11.1 111.1-,-,- kits°

15.11 P201earPtlIC

Tel

--14:1f7F

M 881641

611:4

011911

0 8.5 VOLTS P'P,15,750 HZ0101 COLL.

I0

oo

2 VOLTS P'P.ICHROMAI25V. P/P, (SYNC)R160. R173PIN 7 V91

17 VOLTS P'P.15,750 HZPIN 5 L95

e16 VOLTS P P3.58 MHZPIN 7 IC91

' ria14 55 VOLTS P P.

60 HZ097 COLL

(43 90 VOLTS P P.15,750 HZ, CONTSET JUST BELOWPOINT OF SYNCCOMPRESSIONM123

45 VOLTS P/P,ICHROMAI70V P/P, (SYNC)15.750 HZM126

0 0.7 VOLTS P'P,15,750 HZ095 EMIT

12 VOLTS P/P,15,750 HZPIN 4 L95

1.6 VOLTS P/P,3.58 MHZM107

PHI LCO-FORDColor TV Chassis20QT75

10D 17 VOLTS P/P.ICHROMAI70V. P/P, (SYNC)M125

EXPLODEDVIEW OFBURST OFVIEW 34

6 VOLTS PIP.3.58 MHZD93 .D94

?1111111111111

IIIIIIIIIIIt@ 1.0 VOLTS P P.

3.58 MHZPIN 4 L97 ORM10E1

0.85 VOLTS P'P (4) 12 VOLTS P P.60 HZ 15.750 HZM102 0103 BASE

3 30 VOLTS P'P.15,750 HZ05 COLL.

17-

03 660 VOLTS P'P.15,750 HZM45

LINE VOLTAGE - 120 VACAIR SIGNAL - FOR MONOCHROME SIGNALSCOLOR BAR GEN. - B&K 1245 - FOR COLOR SIGNALSACTIVE FILTER AT 20 VDC

(D 50 VOLTS P/P.ICHROMAI70V. P/P. (SYNC)M113

70 VOLTS P/P,15.750 HZ095 C OLL.

38A 0.8 VOLTS P'P,3.58 MHZPIN 3 IC91

0 1 0 VOLTS P -P.3 58 MHZL98 -R139

0 3.5 VOLTS P P.17.500 HZ0103 EMIT.

420 VOLTS P/P,15.750 HZM48

COPYRIGHT 1971 BY ELECTRONIC TECHNICIAN/DEALER 1 EAST FIRST STREET, DULUTH. MINNESOTA 55802

1373

WO/ILK

P604001-5>--Pe.;

4001 -SLUE

54013ISO

542031000

RCA SALESCORP.Color TV ChassisCTC46 Series

SYMBOL DESCRIPTION

ELECTRONIC J-7 w=orica yirAUGUST 1971COMPLETE MANUFACTU RERS CIRCUIT DIAGRAMSAND TECHNICAL INFORMATION FOR 5 NEW SETS

RCA PART NO. 72-47.25MHz trap 132157

R412 -control, hi voltage adjust resistor 133355 74-41.25MHz trap 132150

C103A-6000f, 100v elect 133446 R608A-resistor control, vert height/noise/kinescope bias .132381 75-4.5MHz trap 132135

C10313-100 pf, 250v elect 133446 RT101 thermistor-ternp comp 116109 7299 -input xformer 130120

C103C-100pf, 250v elect 133446 RT1-thermistor-temp comp 132503 T402 -regulator xformer 132622

C104A-300pf, 175v elect 133447 ICI -circuit -integrated 132314 T403 -flyback xformer 134563

C1048-250pf, 175v elect 133447 RT1 thermistor 50K cold 116109 L1-340 cod 132137

C105A-750pf, 50v elect 133449 DLI -line-delay 132840 L2-47 ph cod 132821

C1056-5000, 40v elect 133449 IC299-circuit-integrated 130751 L2 -coil 330 ph 126834

C105C-50010, 40v elect 133449 CR401-trace diode 131475 L3-1000ph coil 126839

R 1 16 -control, focus 129925 CR402-commutating diode 131476 LI -47.25MHz, null adjust cod 132159

R1 -ACC adjust resistor 132170 RT601-thermistor -temp comp 134099 L6 -IF xformer 132146

R7 -color killer resistor 132170 7103-xformer power 133443 L1 -338h coil 130023

R9-25011 variable resistor 133403 T104 -standby xformer, C7C46A,H 132595 L2-12ph coil 126832

R15 -variable, horiz freq resistor 132170 71-horiz, ose xformer 126729 L299 -discriminator coil 130121

TOPV/600-NP109-15402-15

P03-2

17-47(03

2C150,11°C2T

R309

270 2C4503

I5V

TP 40

R420115K

TOCONTROL

CTC41114

P85102-101 0

84201011 VOLUME R323.

CTC 460.0 3000NOTE:

CTC1611RR

REMOTESCHEMATIC 0

TO P102-9TUNER

MCOI I41

IF INPUT

MITTO P00-2

MAIOTO P102-S

REOTO P02-1

1TMAI

A 15.6

696

FS;UND R299

PM200 0292110

-F ."--713C:17

6(1,1,289

C295

I 01

1

,rii.193,

L

117-1

SOUNDr0"

CO6985.

04;1-L299 0296

DISCRIMINATOAT

3 IC 2992 2516I

If082

sTurg

PW300Re

I v,*0 5,01SIGNAL CIRCUIT

INC/

1,2,11.12, 4 6 6 1L.

I CT21047

NC

`.10

105

5346

J_ 330:302 5C.ISI I/95V7 7

1534255V,

I3 SOUND

100

OUTPUTIMAN 2A 25V

J""c314

C53,1030

:sEENECAPpLuELAT3E,DX PRINTEDCIRCUIT VER5006) 5611

L 5.21 I

15300

5 911

isevDEPENDS ON I3011

0.60

VOLUME CONTROL 1 2200 33075*SETTING

15303

i

3303300 030)0

R302

TO ISVPW300 5

(14) I2K

70::0

6347820

5304mEG

,AA,

spec.

Pe..003-3I'6!v

I

5123 it C112 wrT/ORN--,.,,,

32 0561

TO El

110DI

IMPEDANCE

9

E 120

R121

1

470

$00 220

7PEKI G PAA09-2 AA

M 015v 02-. 5

2

.VIHT/rEL I ..

P14%0, ". .4 TEL .209 Pe503-6750

R4018_.,,....--6800

TOO

54014 P60103-1 51/300 -Fr)) IIBI

MOO wNT/ED Cx

A

iSV

P'f'0?)-4

C40063061 SV

R42072500

22005321I

I.--....Os

-3536

CONTRAST

MT VIDEO00 * L4 DU 0,,2

Rq a00640 22" -I-

Y

330

L322,5C2

01 : R6 RIO0---0_ ve..22 3559 820 5900

R3 STK SEP 411 45 411 -.4* --5 CRI '

/ MEG qi) ,,,n,-, 3100

CS 0. CS 4 781270 5 150V.An.

2 21AE 05511 3

--1

/5V C12 n7

"2"21,0

.12,0.

20 60

,3v W=111 38 wo 't<wer vERT

RATE

CRS

211^2 CR3513

564

R10::120

C11 0

CR2

:0°0

C7 043620 9.-- 240

150 VICIE05SV

CS ,LI

CIO

VIDEO SYNCMAL 1A

Y 4 41, 'f 33 11,

C114

SOV2.,99(). Hi 545,P8300 F

1151 F

11317

) 4e30, 47 F5302 330

SOUND TAKE OFF

64_4151*

ool Is

a C2

C3

C4

53*CS 39

56 5

39 ?Shell

r10c.,/00

039 'I -I-

.60 F00.1 213

I

MACCHROMA I

PART OF 51212 TP-10-11.1ACCUMATic SWITCH .451

C13.011. OOP,

4001-ORR P -2 0--< 9

"09-31 CM'2"

555

ACCU-MATICCOLOR 2SX .2

111

25KACC

044 1;11 ADJ.

CO

I

P150100

I

LEVEL2

rvC'COZORKILLER

3

TP-2 TP-I TP-5

ICIO 012

L L5ie 1-6

PIX IFMAK IA

CO I10 IC IA

I/2 2554-3

F-7 CI CIS

II:.C14

I

247 RS 0 I

2700AI

/4.7v

13.. Cie

001CO

C20e73

L4R6

IC1,3(1

33001

tt Ca i00S 11K

Rey7156.00

RIO

,6.11ViLIO150

RIS

C26

8200 000 430

LS

C22

41.

_412 ion ISV22554-3

13

36

T

ION

2200 1,4

C22,30

I 541 2560,

1C21

C

24574700

C24 r 01

1001

16

523

1200Fri r

470 C30

1022= 424

1000NA,

12

Ri?'000

4

39330

212C14

325

4.10 z

3608-2 VIDEOREGULATOR

023549-1

..I ge_ VIDEO PREM.>

I-,

; E 029 a R121

," !LW1000

1000 ;

7

IC;9 3677

,1111)

,`A`T71111_1111,-111-

`15 ..14

T8520 (DEPENDS ON NOISE CONTROL SETTNG/

O 1000

2

L7COROPAA

PEAKING

COST

ILA

R22 330

C32

220

00

lc,.T62C37C37

1

C33130

C9 r-1.311

,,r---.1-+Iiiieri120ICS 15efe 7 107 2-12 1 3 511141 1200

CIA- CRYSTALC7 Re

10 ,I

_

92 275411

394

"IC4I

36 43005 II

,.; C6-L

RIG i-L2

470 Cil1.047

CI5

.01

2 414

49 680260

IC10

:1°0

C114700

/1 OV 4 4V

5349DN

0300

1011

5 ICtS1/2 2559

5312

44=0_4

) I

de)770

_11,307

21

)51.911

)4 )4

ISV-

I TP-5 *3326$

680

; >"

1

A67 -v

RI

C4304)

1 I

NC71I5O51

560

014100

R32?

1200c3,38 4325, MAE

191q

CROMA

II820 4700

301/PP

1RATE10412

L.

56 220

12 007

CR

-..1'..--'... PP/370-F

12 )4,5V 12A)

CII

5339

01

TP-3

cs0, La C

G -y

8-T

C309

.22

8310

3 5

6900 IC 303

i$00R331*

.11A000

5 7

T t1

ASV pler/ORA RATE39 4 V_<

134_MAD 1A I

YEL/REO

(ENCAPSULATED UNIT)I

RED DRIVEmay_A,i

311

71V

5305"AN1000

011

3030 SOPF11300 -F

0K 1181

R329475

C4103

8311820

03023401

815GHTNE5umrtie

4110VV,1000

P60102-5

53223300C305 4 48Y

BO TOIP20v 15122/

*al R320 "I'm3319 47009100 1W

0-111.01 NV1,)

C3.7

1100:32.TO /

7 660

IIIYI

C

CR

4 4V Ra!,-R3 4 I 5334

RED150 220 DRIVI

!v< 2E ) 1500

5<_.40 ....WIZ RATE_.affAairgi

I

MAD IAI

TEL /044

I (ENCAPSULATED UNIT

GREEN DRIVE

4,4 4..131 )!9!v

4 IV 43,70.31S 4536 ISO 220 GREEN

DRIVE

5 F 47.1)'

...MORIZ RATE_,I59 ) TEL/EILL1

MAD lAIENCAPSUL ATED UNIT( I

BLUE DRIVE ,1 )3,,,4, .1.1ii_.,__ 4

J

L 4316 I

44P 11170BLUECLUEI

5336

A. 5313 11. 1011

0 Wu 94m

17MAR4017 R42049TINT

235613 C13 .01 565400,-7 1900 10.500 _t 4001-9

7 5.430 .161.001-11R4

78 91- new

//tII_1______L1_), GRN°4-OFF-i1

J.16,103-13 0or_: . 1 IOFF --... -OW

PART OF ACCumATIC SWITCH 54212TO ATI" "

OAF

F<NIT/IILLI

0611

3-.4HT,110 596 -4PiO3

c,FF' - '04"J454001-10

cRY.19.103-15 I

J9P J95103-14100I-2ISO 220

'P?O'Fr/F1332

TO PP/400-my& 006-5000E PLUG 1914)

_L301

1,0M SS

TO 2250SOURCE TO(051 PW400-SS

SYNC 4

AGOG

1

ReRe

A, I

TOPP/400-AL

VERTICAL (GPI

5510

vIMTRATE

J

L

350 P -PMOMROE


A

B

C

PRI14202

RDJP02 - 1500

IVH<T/

IIRN

TO04011

F -

1T101

177

NOTES

RESISTANCE VALUES RE N OHMS. 101000

2 CAPACITANCE VALUES I 0 AND ABOVE ARE IN pl. LESS THAN 10 ARE RI of.UNLESS OTHERWISE SPECIFIED

3 III INDICATES S% TOLERANCE

4 R 11 INDICATES 2% TOLERANCE

5 VOLTAGES ARE MEASURED TO CHASSIS GROUND WITH vOL TOHYST' (NO SIGNALAPPLIED! AND SHOULD MOLD WITHIN 520 AT RATED SUPPLY VOLTAGE. VOLTAGESSHOWN HAVE POSITIVE POTENTIAL UNLESS OTHERWISE SPECWIED

WAVEFORMS TAKEN WITH COLOR BAR IDOT-BM GENERATOR/ SIGNAL APPLE° AT100% MODULATION

7 SEE DEFLECTION CIRCUIT AND POWER SUPPLY SCHEMATIC DIAGRAM.

NORM- NAST- SERV

:5604

5 6

71

or

RT601TO JUNCTION016011 8606I $000X1010 WHIZ PICTURE TUBEIC

1

0 .1.A.

703111 SOCKET111

1515ES SCREEN 13 6/NVOIVIII.1.1 1132 13

TOI IC1103 1000I.....

'°°)

-4 41 trc4 <,, PW400 -D

mIL 1 I,

51.EGt_c,KEN

, .., ,. : .°°°V 4

MOM ... ----F1'A-.---j--000SM._ 03It, VISA

w: :int.R1,33

°4000_, ' RED_L 20V., C11

0102

I

/141/ YEL/11t0

4ab Jvs, .

1000 }.SOON

2

p.SMS.

SCREEN 1

IC601 3900 .1861011

11135...

vs1.1.1V V Lamm

T-0 0

011/

LTEL /SLY 140,11 II

1000--- - -1 /3.2r 3900 ...

vvs

RED RISSSA,ROO

RS02., SORK

ism 411

-= R611 00

rev

2200

PR 300-1411.21

.15V

12,01502

3

71

II, /3131,

-1 I

'X' 100

RR615 604

i174

3 2C

' '

0NOISE zAIRE BIAS

1 PART OF PW600

IAUX CONTROL

BOARD/\ /

409111 2* MOIR

J

K

L5241301

1000

GREEN 1 NOS

;titSLUE

Jr- `,Jsao14000 7

jimmy

oioo J WIC<. 5.00V

3900 TO 11161 I 14

FOCUSVOLTAGE

3-5 XV 1

_i_v L _ _ _ _ _JSRN SRN

FOR CONTINUED 0 -RADIATION ANDIMPLOSION PROTECTION REPLACEPICTURE TUBE WITH SAME TYPEOR RCA APPROVED TYPE ONLY

TO TIO3TEL /ORR

R SRIOS1500

PICTURE TYRESOCKET GROUND TO 1104STRAP CONNECT SRNTO DEGAUSSINGSISELO ONLY

RATE

4iyosii60

v oHOPIRATE

MVO.,

I] OUTM

WHITE

1.11202MAL

01.050502

DOT

F.

SAL04

MAK01RAE01

.003

o 40 90 120 150

o So 60 1I0 NO

10 Io To 100 130

P103

.1109

<10 3. 3.1P109

1VAKP 22

2 AAAAAA 2

PICTURE TYRE

TO 505-101OUTPU DM -VOLT:265 4015 mei

BRIGHTNESS

.14001

So to 120

o SO 50 110

lo 0 70 100P4001

J102

o Go 90 120

O So So No

10 .10 yo 100

PlOt

AGC

I RI710K

1000C17

I

27

FERRITE\BEAD

R16RI6820KWV

CI9"5Os)00 0 STAND OFF TERM C16

01 0 1171 00

KRK 165

130

C29,2-10

0

Ri3iaok

110 02

100 03

90 04

O 0 0567

S4 FRONT

L21

C20 BEAD IFERRITEF- - 1J2

- -R20 1500

i39

RI8

R?210)( L27

TO CI1,115V #1.4

1.15V 10.0

RCA SALES CORP.Color TV ChassisCTC46 Series

01 023524 3524

C6 0 CS

47 0 1000

R5560

FERRITE

BF-AD100"gv

HE3524

5.045/ 84,

TPI 0 e30(-- IC/ C..00

AWDTERM

C4 0

R7 R63900 4700 10R8K.-

CII9.0

L8L9

L5

COUPLINGs HI uBpAuNDNG

ADJ.

LI2

S3 -L11 REAR

C1247

560 12

10

S2 -L6 FRONT

TRANSISTOR BASING DIAGRAMGATE 2 GATE I

ANTENNAINPUT

ALL RESISTANCE VALUES IN OHMS. K=1000.ALL RESISTORS 1/2 WATT EXCEPTAS INDICATED.

ALL CAPACITANCE ALOES IN PF EXCEPTAS INDICATED

ALL SWITCHES SHOWN IN CHANNEL 13 POSITION.

DENOTES THRU CONNECTION OF ROTOR BLADES.154. CONTACT INSULATED FROM CONTACT

ON OPPOSITE SIDE OF SWITCH

C254.7

IF OUTPUT

L5

_L

IIC72.2

R3 -1C86800 3.3

-13.3

04 I-11)03527.5.C26L03I

N

4.7

12

121oi--1730 47

L2910,0 II

,vL410011

CI10000 0

000TR4

03

* 2634A' os C

39L3 5 R20

[1.113 LI

100

*rb,3f) Og.10

Ar*,

ti5V"RI4 6 727KS1, L28

C24, C23

.11

L3

S6

CR1

J,O

L9

+-HsC527 /C4

1000

I SK

R7474I/4W

TO AFCCONTROLVOLTAGE

599

LIO

I C 3.L470

0 2 0

O

C6082

R1

1K1/4W

2.2K

II

RI1500

1

S5

CIO

182--- /MEM?TO

REMOTE

C782

ISVB+

AMP

AFTa

C9

(82

IFOUTPUT

R4100K

L6I

jImr/4KW1/4WL __J

KRK 156

GANGED TUNING CAPACITORS

CR2


1374EMERSONTV ChassisT2R2-1A

AUGUST 1971

EncLEAN1192112 2"7-7,6-mi41COMPLETE MANUFACTURERS' CIRCUIT DIAGRAMSAND TECHNICAL INFORMATION FOR 5 NEW SETS

ELECTRONIC TECHNICIAN/DEALER is pub-lished monthly by HARCOURT BRACE JO-VANOVICH PUBLICATIONS, INC., 1 East FirstSt., Duluth, Minn. 55802. Subscription rates:One year $6, two years $10, three years $13,in the United States and Canada. Other coun-tries: One year $15, two years $24, threeyears $30. Single copies 75s1 in the UnitedStates, and $2 in other countries. Secondclass postage paid at Dansville, New Yorkand at additional mailing offices. Copyright1971 by HARCOURT BRACE JOVANOVICHPUBLICATIONS, INC.POSTMASTER: Send Form 3579 to ELEC-TRONIC TECHNICIAN/DEALER, HARCOURTBRACE JOVANOVICH PUBLICATIONS, INC.,1 East First St., Duluth, Minn. 55802.

it

SYMBOL DESCRIPTION EMERSON PART NO.

R208 -500K volume control (includes R320 and S5011 970989R320 -25K video control 970989R418 -5M vert height control 970001R422 -1.2M vert hold control 75A100.8R502 -5.5n, fusible resistor 61A48.1R503-7500. 5w, 10% resistor 970990R504 -100n, 5w, 10% resistor 61A20-76C432-100 pf, 4kv, 10%, N1500, or disc 970994C504A-150 pf, 165v elect 970996C50413-150 pf, 150v elect 970996C504C-2000, 150v elect 970996L20IA-sound IF cod 72A301 2L2018 -sound IF cod 72A301.2L202 -quad coil (includes C207) 970383L309 -video peaking coil 73A5-20L401-honz hold coil 94A17.19T201 -audio output /former 79A1245T303 -sound takeoff and 4.5MHz trap 72A185-5T401-vert output :former 79A139.4T402-defleciton yoke 94A372-1T403-horiz output xformer 970998

VHF TUNER 94C281-17L.06C

1 L106 ',III .- HI 11 Pair(web 11410015

2 L7it__411 _ -12 -42 -kJ,

(105

7ac1

Irm07 (04

L103

par 7777

1102

77

ii01 c611 77

-

1(103

uu (1221.6

1

(101

tI

L1060

1 L.0513 LIOSC55; L.a5511.

1 ',TIT, -111T.- 111115 7 1005 11

LIlO

CM'

L113 IICAN

541117111

014'000

f -t-)

IWO

0 0-111102 WV

130 . 111 Clb 110

100* 1114/115/97-

1 I

,,

3GK5SIP

V,01

1101

2701

'/25LJ8VII 4111(1

v1024,

L1030

ot j

1/2 5LJ8,... 1107 I,p ,,..scv 0213

-if111Is6,/ ocL108(PIN/

,25.Cut

771 11 XIN, 1 21A /K

114I 1 ow Twos

11:141C2117

L109

1 its4

C111 hi

0111

/0s 0103

(C1111

1000

IS 1

trot -

4-14i:41

0

111104

_ WU

-clot04710

117r I

100

MODEL/CHASSIS CROSS-REFERENCE CHART

MODEL NO. MODEL TYPE. CHASSIS NO. PICTURE TUBEVHF

TUNERUHF

TUNER

9FP02 (Plastic)Beige -White

T2R2-1A 10ASP4 971034 94A296-4

9FP03 (Plastic)Green -White

T2R2-1A 10ASP4 971034 94A296-4

9F PO4W(Plastic)

Walnut -BlackT2R2-1A 10ASP4 971034 94A296-4

1/28JV8P W S 714C463-2

v351(73 1`,11IN°1

emu4.2 L_1'.Or

0100,01,53/

L201En/Jr

4DT6A :14'01.0011 701110051

V201IV Fr-i

litC0

1/'

01110

/050

122a

20103CO3

VOLUME12015001

17101001

0006

4., IIR

IC)

II it, Of Ills1/111 del 1011.29

I l UHF TUNER 94C296-4I I m.H21:71 r - L '51 113--I,

1 401455t _ _ _...1.019.111 MIA I

VW'1

Ifr--1/A46 0102/7/ .,/,,/, .,,,, ,z,

E Lola( ...?NI uor /If I- -pr-

101I

U 1/09. 1

cassi

eruct I553 93A59-1 I I

off 11.491I

nisoi_(_ 1111

0156

/00/7 10% 172 -000

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COPYRIGHT 1971 BY ELECTRONIC TECHNICIAN/DEALER 1 EAST FIRST STREET. DULUTH. MINNESOTA 5 5 8 02

PROVIDES YOU WITH ACOMPLETE SERVICE FORALL YOUR TELEVISIONTUNER REQUIREMENTSAT ONE PRICE.

VHF Or UHF Any Type $9.75.UHF/VHF Combo $15.00.

In this price all parts are included.Tubes, transistors, diodes, and nuvistorsare charged at cost.

Fast efficient service at our four con-veniently located service centers.

1 year guarantee backed up by thelargest tuner manufacturer in the U.S.-SARKES TARZIAN, INC.

All tuners are cleaned inside and out,repaired, realigned and air tested.

TSC

Replacement Tuner $9.75.

This price buys you a complete newtuner built specifically by SARKES TAR-ZIAN INC. for this purpose.

The price is the same for every typeof universal replacement tuner.

Specify heater typeParallel 6.3VSeries 450 mASeries 600 mA

All shafts have the same length of 12".Characteristics are:

Memory Fine TuningUHF Plug InUniversal MountingHi -Gain Lo -Noise

If you prefer we'll customize thistuner for you. The price will be $18.25.Send in original tuner for comparison pur-poses to our office in INDIANAPOLIS,INDIANA.

TUNER SERVICE CORPORATIONFACTORY -SUPERVISED TUNER SERVICE

MIDWESTEAST

SOUTH-EASTWEST

817 N. PENNSYLVANIA ST., Indianapolis, Indiana1Home Office)

547-49 TONNELE AVE. Jersey City, New Jersey

.938 GORDON ST., S. W., Atlanta, Georgia

SARKES TARZIAN, Inc. TUNER SERVICE DIVISION10654 MAGNOLIA BLVD., North Hollywood, California

TEL: 317-632-3493

TEL: 201-792-3730

TEL: 404-758-2232

. . . TEL: 213-769-2720

.. for more details circle 128 on Reader Service Card

AUGUST 1971, ELECTRONIC TECHNICIAN/DEALER; 19

Cut arc-back iTV damper circuits

with RCA tubes...6AF36AY3B6BS3A6CG3/6BW36CJ3/6CH3

All have the pre-

6CL36DW4B17AY3A

17BE3/17BZ317BS3A/17DW4A

coated cathode!

These are the 10 most popular industry types for TVdamper circuits. The cathodes in these RCA tubes are pre -coated to reduce arcing.

A special manufacturing process pre -coats the cath-ode and pressure -welds the coating. This produces asmooth, uniform surface that virtually eliminates arcing.

In every way, the quality that goes into these tubesbacks up your reputation for quality work. Systematic

parts inspection, tough environmental testing, sample lifetesting ... these are some of the ways we build quality inand then check it out.

See your RCA tube distributor for the complete lineof RCA tubes for damper circuits, high -voltage circuits andall your other tube needs.

RCA I Electronic Components I Harrison, N.J. 07029.

RCA20 I ELECTRONIC TECHNICIAN/DEALER, AUGUST 1971

PHILLIP DAHLENEditor1 East First StreetDuluth, Minn. 55802(218) 727-8511

ALFRED A. MENEGUSPublisher757 Third AvenueNew York, N.Y. 10017(212) 572-4829

TOM GRENEYPublishing DirectorJOSEPH ZAUHARManaging EditorCAROLYN SANDAssociate EditorBERNICE GEISERTProduction ManagerBOB ANDRESENGraphic DesignLILLIE PEARSONCirculation FulfillmentJOHN KESSLERManager, Reader Services

MANAGERS

DEAN GREENER43 East Ohio StreetChicago, III. 60611(312) 467-0670

CHUCK CUMMINGSAd Space South/West613 North O'ConnorIrving, Texas 75060(214) 253-8678

DONALD D. HOUSTONKEN JORDAN1901 West 8th StreetLos Angeles, Calif. 90057(213) 483-8530

CHARLES S. HARRISONCY JOBSON57 Post StreetSan Francisco, Calif. 94104(415) 392-6794

ROBERT UPTONTokyo, JapanC.P.O., Box 1717

ELECTRONICTECHNICIAN/DEALER

AUGUST 1971 VOLUME 93 NUMBER 8

Four aud,o-response channels in hues of red, blue, green and yellow are shown in thismonth's cover photo of EICO's Sound N' Color Model 3450 Audio Two -Color Organ. Covercourtesy of EICO.

3 TEKFAX: Up-to-date schematics for easier servicing.24 EDITORIAL: Facing the Heat.26 LETTERS: Pertinent comments concerning past issues.28 READERS' AID: What you need or have for sale.30 NEWS: Events of interest to our industry.33 NEW AND NOTEWORTHY: Merchandise of special interest.

FEATURES

39 MATV MADE SIMPLEBasic principles to consider when designing a practical master antenna system-by Keith T. Peterson.

42

44

45

46

47

50

52

HOW TO EXORCISE CITY AND SUBURBAN GHOSTSAntenna installations become more effective when you know the cause of those an-noying "ghosts" and techniques for eliminating them-by Lon Cantor.

SEMI -TIPS -PART IIBasic principles that must be understood for the effective servicing of circuits con-tairing zener diodes-by Jack Jaques.

UNDERSTANDING TODAY'S CAPACITORS -PART IICapacitor replacement can be more effective with a better understanding of elec-

capacitors-by Richard Marsh.

SERVICE TRAINING SCHOOLSThe efforts of one manufacturer to update the technical skills of electronic tech-nicians.

SERVICING THE AUTO STEREO TAPE DECK -PART IICase histories related to specific problems in servicing auto tape decks-by HomerL. Davidson.

COLOR TV RECEPTION -PART IVEffective servicing also requires a thorough understanding of how the color CRTfunctions-by William Spero.

GUEST AUTHOR: SOLID STATE REPLACEMENT -PROBLEM OR PROFITJack Devinsky, manager of Replacement Solid State Merchandising, RCA ElectronicComponents, tells how your revenue can increase with the proper selection of re-placement semiconductors.

53 TEST INSTRUMENT REPORTReviewing specifications for Leader's Model LSW-330 Post -Injection Sweep/MarkerGenerator.

55 NEW PRODUCTS: Instruments and components to make your job easier.56 TECHNICAL DIGEST: Hints and shortcuts for more effective servicing.62 DEALER SHOWCASE: These items may increase your sales revenue.66 BOOK REVIEWS: Our appraisal of recent publications.68 ADVERTISERS' INDEX: Manufacturers concerned about you.69 READER SERVICE: A source of additional information.

[ftila j A HARCOURT BRACE JOVANOVICH PUBLICATION WE Go

ELECTRONIC TECHNICIAN/DEALER is published monthly b' Harcourt Brace Jovanovich Publications.Corporate Offices: 757 Third Avenue, New York, New York 10017. Advertising Offices: 43 EastOhio Street, Chicago, Illinois 60611 and 757 Third Avenue, New York, New York 10017. Editorial,Accounting, Ad Production and Circulation Offices: 1 East First Street, Duluth, Minnesota 55802.Subscription rates: One year $6, two years $10, time years $13, in the United States and Canada.Other countries: one year $15, two years $24, three years $30. Single copies: 750 in the U.S.and Canada; all other countries $2. Second class postage paid at Dansville, New York 14437 andat additional mailing offices. Copyright © 1971 by Harcourt Brace Jovanovich, Inc.POSTMASTER: Send form 3579 to ELECTRONIC TECHNICIAN/DEALER, P.O. Box 6016, Duluth,Minnesota 55802.

AUGUST 1971, ELECTRONIC TECHNICIAN/DEALER1 21

Well put you at yourcustomers' fingertips.

There's a special Aro, you can meet cus-tomers w thout liftmc a fiiger The Yellow Pages!The ve 1:.-w Pages is every town's completeshoppers' service

Hcw can you best tae advantage of theYellow Fages? Ask your l'ellcw Pages rep-esen-tative tc he.lp ycu ixer are ads for any or all YellcwPages le IBphone directories coast to coast.

Remember, 3 out of 4 potential customerslet their fingeff dc the walking. Advertise ii theYe low =ages.

3 CU: of 4 prospectsletlteirLingers dc the walk' ig.

22 I ELECTRONIC TECHNICIAN/DEALER, AUGUST :971

The replacement picture tubeno other color tube

can replace!

Simulated TV picture

Now you can install the revolutionary Chromacolorpicture tube in almost any brand of 23" (diag.) colorTV. And let your customer see the difference: a new,sharper Chromacolor picture with greater brilliance,contrast and color definition.

Zenith pioneered, developed and patented (U.S.Patent No. 3146368) the Chromacolor picture tube.And only Zenith has Chromacolor.

Chromacolor is an easy sale because people al-ready know of Chromacolor's superiority. (Last year,after the revolutionary new Chromacolor system was

TWO-YEAR WARRANTYZenith Radio Corporation warrants the replace-ment CHROMACOLOR picture tube to be freefrom defects in material arising from normalusage for two years from date of original con-sumer purchase. Warranty covers replacementor repair of picture tube, through any authorizedZenith dealer; transportation, labor and servicecharges are the obligation of the owner.

A\AAAC iR®

introduced, Zenith giant -screen color TV sets becamethe No. 1 best-seller!)

Full two-year warranty.Here's your sales clincher Chromacolor replacementcolor tubes are warrantec for two full years. Exactlydouble the warranty period for most other replace-ment color picture tubes.

Give your customers the best - Chromacolor re-placement color tubes. Only your Zenith Distributorhas them.

Zenith Chromacolor picture tubepinpoints the color dots on ajet block background and for thefirst time fully illuminates every dot.

The quality goes inbefore the name goes on

AUGUST 1971, ELECTRONIC TECHNICIAN/DEALER 23

EDITORIAL

Facing the HeatThis year's Consumer Electronics Show has certainly been one that Joe

and I will never forget! Although in Duluth the day's high was not much morethan the low 60's, upon landing in Chicago we encountered 100 plustemperatures. Then, the second night in our hotel, a Catholic priest onefloor below us was strangled in his bed. For some reason, Al Menegus, ourpublisher from New York City, requested that Dean Greener, our Chicagodistrict manager, share a room with him the third night.

Even if this tragedy and the weather could have been ignored, at theconvention we observed some of the "heat" that you will be facing in thecoming year-the threat of technical obsolescence for those techniciansunable to keep up with the rapid pace as manufacturers compete for agreater share of the market.

The forecast for 1972 sales are bright. The American public insists on beingentertained whether their job situation is good or not. And many electronicmanufacturers, feeling the pinch from reduced military and industrialelectronic sales, are going all out to get their share of this healthy consumerelectronic market. But in doing so, competitive pressures are forcing them toapply aerospace technology in the development of new consumer products.We noted an increased emphasis on miniaturization and the use ofsemiconductors.

At a special luncheon for the press, we were introduced to a new magnetic -tape system that is to be introduced by several manufacturers. It is smallerthan the two present cartridge -tape standards and will permit the installationof tape systems in the dash of cars, rather than under the dash as is nowcustomary. Some rather pleasant music was played during the demonstration.- A major U.S. manufacturer has drastically modified the design of its TV -set

power supplies. The earlier power supply was self regulated; and with thetransformer and large capacitors, it must have weighed about 25 lb. However,by converting the power line frequency from 50 or 60Hz to that of thehorizontal -sweep circuit, the transformer and related circuitry were reducedto the point that they could fit comfortably in your hand-probably weighingless than 2 lb. This power supply is used to provide the power for the solid-state circuits in the balance of the receiver.

We visited the hotel room of one new west coast company that was justrecently formed by executives formerly employed by an industrial instrumentcompany. The gentleman that I spoke with said that they did not manufactureany products that have ever been on the market before. And upon looking athis line of consumer electronic products, this seemed to be true. Some ofthese new products will be seen in the New Products Section in futureissues of ELECTRONIC TECHNICIAN/DEALER.

As we toured the booths we were able to observe that TV sets are followingthe lead of audio components. There are several manufacturers now producingcolor -TV sets for which the only tube is the CRT-and that in a few yearswill also become obsolete. At one booth we observed an FM radio thatcontained a clock and what appeared to be two clear sheets of glass.However, embedded in the surface of the clock were liquid crystals whichcould be observed only when agitated with electricity applied throughtransparent conductors. When looking through one glass we saw numberstelling the frequency of the FM station received, while the numbers in theother glass could indicate the current time on any portion of this planet.

Some of the electronic technicians attending the Consumer ElectronicsShow were not sweating from the heat outside, but from the fear ofbecoming technically obsolete.

24 I ELECTRONIC TECHNICIAN/DEALER, AUGUST 1971

Now -Just 3 RCA Hi-Lite"V" Type ColorPicture Tubes Replace Types

Replaces 92 types18VABP22 19HCP22/ 490ASB2218VACP22 19HKP22 490BAB2218VADP22 19H FP22 490BCB2218VAHP22 19HJP22 490BDB2218VAJP22 19HKP22 490BGB2218VAQP22 19HQP22 490BH B2218VARP22 19H RP22 490BRB2218VASP22 19HXP22 490C 62218VATP22 19JBP22 490CH 62218VBAP22 19JDP22 490CUB2218VBCP22 19JHP22 490DB2219E XP22 19JKP22 490E B2219E XP22/ 19JNP22 490E 622A19GVP22 19JQP22 490F B22

19EYP22 19JYP22 490G B2219EYP22/ 19JZP22 490H 62219GWP22 19KEP22 490JB22

19F MP22 19KFP22 490JB22A19F XP22 490AB22 490KB2219GLP22 490ACB22 490KB22A19GSP22 490A DB22 490LB2219GVP22 490AE 622 490MB2219GVP22/ 490AF 622 490N622

19E XP22 490AGB22 490R B2219GWP22 490AH B22 490562219GWP22/ 490AHB22A 490TB2219EYP22 490AJB22 490UB22

19GXP22 490AJB22A 490VB2219GYP22 490AKB22 490WB2219GZP22 490AL B22 490XB2219H BP22 490AMB22 490YB2219HCP22 490ANB22 490Z822

490ARB22

Replaces 22 types19VABP22 21FJP22A/19VACP22 21GVP2221AXP22 21F KP2221AXP22A 21GUP2221AXP22A/ 21GUP22/

21AXP22 21FBP22A21CYP22 21GVP2221CYP22A 21GVP22/21F BP22 21FJP22A21FBP22A 21GXP2221FBP22A/ 21GYP22

21GUP22 21GZP2221FJP22 21HAP2221FJP22A

Replaces 71 types23VACP22 25AEP22 25BRP2223VADP22 25AFP22 25BSP2223VAHP22 26AGP22 25BVP2223VA LP22 25AJP22 25BWP2223VAMP22 25ANP22 25BXP2223VANP22 25AP22 25BZP2223VAQP22 25AP22A 25CBP2223VA RP22 25AP22A/ 25CP2223VASP22 25XP22 25CP22A23VATP22 25AQP22 25FP2223VAUP22 25ASP22 25FP22A23VAWP22 25AWP22 25GP2223VAXP22 25AXP22 25GP22A23VAYP22 25AZP22 25RP2223VAZP22 25BAP22 25SP2223V BAP22 25BCP22 25VP2223V BCP22 25BDP22 25WP2223VBDP22 25BFP22 25XP2223VBEP22 25BGP22 25XP22/23VBGP22 25BHP22 25AP22A23VBHP22 25BJP22 25YP2223VBJP22 25BMP22 25YP22/23VBRP22 25BP22 25BP22A25ABP22 25BP22A 25ZP2225A DP22 25BP22A/

25YP22

Here's the way to save yourself time, give your customers fasterservice and improve your profit. Stock these three RCA Hi-Litecolor picture tubes and have immediate replacements for thefastest moving industry types - 185 of them.

RCA Hi-Lite types are all new. made to OEM specifica-tions and contain the newest RCA manufacturing technology,including Perma-Chrome and the latest X-ray attenuating glass.

It adds up to a big plus for you. Order these three RCAHi-Lite tubes, and other types you may need, from your RCADistributor. He also has the comple:e RCA InterchangeabilityGuide, available free of charge.RCAF Electronic Components I Harrison, N.J. 07029

Rim Electronic


INTERNATIONAL LETTERS

Frec uencyme,_er

MOBILE

WRITE FOR CATALOG!

Tests Predetermined Frequencies25 to 1000 MHz

Extended Range Covers 950 MHzBandPin Diode Attenuator tor FullRange Coverage as SignalGenerator

Measures FM Deviation

FM-2400CH

The FM-2400CH provides an accurate frequency standard for testingand adjustment of mobile transmitters and receivers at predeterminedfrequencies.The FM-2400CH with its extended range covers 25 to 1000 MHz. Thefrequencies can be those of the radio frequency channels of operationand/or the intermediate frequencies of the receiver between 5 MHzand 40 MHz.Frequency Stability: ± .0005% from +50° to +104°F.Frequency stability with built-in thermometer and temperature cor-rected charts: ± .00025% from + 25° to + 125° (.000125% special450 MHz crystals available).Self-contained in small portable case. Complete solid state circuitry.Rechargeable batteries.

FM-2400CH(meter only)...$595.00

RF crystals (with temper-ature correction) 24.00 ea.

RF crystals (less temper-ature correction) 18.00 ea.

IF crystals catalog price

INTERNATIONAL

CRYSTAL MFO. CO., INC.10 NO. LEE OKLA. CITY. OKLA. 73102

Reader comments concerning pastfeature articles, Editor's Memos, previousreader responses or other subjects of

interest to the industry.

Article Promotes SafetyThank you very much for the cop-

ies of ELECTRONIC TECHNICIAN/DEALER. I was very pleased with theoutstanding editing on the microwaveoven article, which gave it an excel-lent presentation.

Through a mutual acquaintance,this May issue was given to a memberof the Safety Board of Kaiser SteelCorp. in Fontana, Calif. It turns outthat Kaiser Steel has many micro-wave ovens of this type locatedthroughout their plant for the use oftheir employees to cook or warm theirfood during lunch breaks.

I have been told that their ovens donot have any specific safety instruc-tions for the employees to abide by.However, I understand that the articlewill be presented to the Kaiser SafetyBoard for possible adoption of ruleson the use of their ovens. The safetyofficer who obtained the copy conced-ed that he was ignorant of the factthat their ovens contained such poten-tial hazards!

This also proves that ELECTRONICTECHNICIAN/DEALER contributes tohumanitarian benefits as well as offer-ing technical advice.

LEW CHRISTY

Agrees With June EditorialYour editorial in the June 1971 is-

sue of ELECTRONIC TECHNICIAN/DEALER is as excellent an article as Ihave ever read on the subject.

For several years I have been pro-moting, through various organization-al efforts, upgrading our industry inthe Kansas City area through knowl-edge.

I started servicing radios in 1928,and have been at it almost continually.Since that time I have seen literallyhundreds of shops come and go. Allof them failed for the same reason-lack of knowledge! Some business,some technical.

It is my contention that educationwould have prevented the majority ofthese failures.

For the past several years I havebeen setting up classes through localboards of education, going into a localterritory through the parts distributorin that area. I set up training pro-grams for 20 to 30 men, and through

continued on page 66... for moredetails circle 115 on Reader Service Card

26 ELECTRONIC TECHNICIAN/DEALER, AUGUST 1971

When you're in a hurry, it's nice to know Sylvania has the parts.Only 34 tubes and ECG solid-state components will

solve practically all of your high -voltage rectifier re-placement problems.

And they're all available from your Sylvania dis-tributor.

Because tubes are tubes, we can't promise to reducethe number you'll have to carry. But, with the Sylvanialine, your distributor will have the tube you need whenyou need it.

In semiconductors, the story is different. Just 124ECG solid-state devices including transistors, diodesand integrated circuits will replace over 41,000 differ-

ent types. In the high -voltage section alone, only 8ECG rectifiers and triplers will take care of almostevery job.

And they save a lot of space in your tube caddy.When your distributor is stocked with Sylvania

receiving tubes and ECG semiconductors you'll havethe parts you need. And you'll get them fast.

It's like having a complete warehouse built intoyour telephone.

And that should help you make a fast getaway.

erjj SYLVAN IA

if) GREAT NEW VALUES INCHEMICALS atid TOOL KITS!

#4901 WORKMAN,,t 1134 TFC111,1111K,)

BOX 3828 SARASOTA. F LA 3 3.-ilti

ModelSC6A-8

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READERS' AID

Space contributed to help serve thepersonal needs of you, our readers.

Needs SchematicI need a schematic for Model 906

signal generator made by the McMur-do Silver Co. Also, a tube replace-ment sketch would be of help.

DUKE HOLY5443 5Ist Terrace No.St. Petersburg, Fla. 33709

Needs InformationI would like to find service infor-

mation or a schematic diagram for a"Graetz" canzonetta, Model 816E,AM/FM/SW radio.

JAMES R. LEONARD

13 Seabrook Rd.Hyannis, Mass. 02601

Shop For Sale

We wish to retire as soon as we canfind the right man or couple to takeover our appliance and TV businessof 21 years. With over $200,000 ofyearly sales and services, the businessis town of about 6000.The business should pay for itself inabout four years. We are willing to in-ventory out and rent or sell the build-ings.

LEUTYS RADIO TV110 S. BroadwaySalem, Ill. 62881

For SaleI have previous issues of ELEC-

TRONIC TECHNICIAN/ DEALER for sale.JACK STUART

Box 991El Paso, Texas 79946

"Everytime I change channels my neighbor'sgarage door goes up!"

... for more details circle 132 on Reader Service Card


134 newstockanswersto keep your wiringjobs on schedule.

134 new stock cables and cords for: communicationsbroadcast audio sound data-coax, twinax controls instrumentation strain gages CCTV cameras MATVretractile cords for telephones, microphones and power.

They're exceptional items to find instock. BA your Belden Distributor

offers them. Over 134 new electroniccable and cord offerings have beenadded to the continually growing lineof Belden standards. We like to keepnew standard products coming. Tomake your critical wiring applicationseasier to cope with. To keep your proj-ects on schedule. Get a copy of thelatest Beldei catalog. It identifies and

)describes al the new items, plus thelongest, strongest line of electronicwire cable Eround. See your BeldenDistributor cr write: Electronic SalesService Dept., Belden Corporation,Richmond, Indiana 47374.

Electronic Sales Service Dept. BELDEN laBelden CorporationRichmond, Indiana 47374

* Please send me

the latest Belden Electronics Catalog

Name

Title

Company

Address

City

Type of Business_8-1-1

State Zip


Sharper, brilliant

Jitter -Free intensity or

pulse markers!

SMG-39 LECTROTECH

sweeper marker generatorA precision sweeper with quality and features found only inhigh priced laboratory instruments. The SMG-39 utilizes postinjection markers for fast, accurate alignment of any tele-vision receiver when used with any standard oscilloscope.The SMG-39 provides all needed bias' and linear sweepingsignals for accurate alignment. Unique marker display en-ables accurate marker positioning for superior receiver align-ment. VFO facility provides any additional marker from 39MHz to 49 MHz for protection from future obsolescence, mayalso be used for spot alignment.

Exclusives Jitter -Free Intensity or Pulse Markers VFO Variable Marker

4 Bias Supplies including - 67 Volts

Pulse Vertical(Overall Chroma).

Marker Options

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Clean, bright Jitter -Free pulse markers All markers ofequal amplitude regardless of position on response curve. Adjustable marker amplitude Marker location accuratelydetermined with brilliant pulse or intensity markers (a mustin AFT alignment) All signals have blanking included forzero base line

FULL TWO YEAR PARTS WARRANTY

SMG-39Solid state, glass epoxy circuit boards.

33950Complete with all cables. NET

I See your distributor or write Dept. E-9

LECTROTECH, INC.4529 North Kedzie Avenue Chicago, Illinois 60625


NEWS OF THE INDUSTRY

Jerrold Holds AdvancedMATV Technical School

More than 60 MATV technicians and contractors at-tended the advanced MATV Technical School held by Jer-rold Electronics at the Howard Johnson Motor Inn in Wal-tham, Mass. The two-day course covered the interface be-tween MATV and CATV systems, system design and lay-out considerations, advanced MATV techniques, aerial andunderground construction, trailer park systems, handlingmore than 12 channels, proposal and specification writing,and two-way systems.

Instructors for the school were Allen Pawlowski, Jerroldsystems engineer, and Lenny Elkings, Jerrold Eastern re-gional sales manager. In addition to advanced technicalinformation, they covered the business and marketing as-pects of MATV.

Jerrold has been holding MATV training schools for al-most two decades. This year, 17 two-day sessions areplanned, covering the entire country and including In-structional Television Fixed Service training.

X -Ray Radiation Found to beMinimal fm TV Technicians

The conclusion of a report by the U.S. Department ofHealth, Education & Welfare's Bureau of RadiologicalHealth on findings of an x-ray exposure survey of 70 Bal-timore, Md. TV repair shops showed that TV techniciansin some instances are exposed to a small amount of x-raywhile working on color -TV receivers, but the public healthsignificance of their exposure is minimal.

John C. Villforth, the bureau director, pointed out thattechnicians, unlike color -TV set viewers, often must beclose to operating x-ray sources-such as picture and highvoltage tubes-without the protection of the receiver cabi-net and internal shielding. He also noted that x-radiationrates inside the sets usually were found to be below 0.5mr(milliroentgen) per hour, the Federal limit for x-ray emis-sions outside TV receiver cabinets. This means, he said,that in many cases the amount of radiation penetrating thecabinets was virtually zero.

"On the basis of information obtained in this study, wefeel safe in saying that the health significance of x-radia-tion exposure to TV technicians is minimal and that fur-ther efforts to evaluate occupational exposure to this groupare unnecessary," Mr. Villforth stated.


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G-921 75 ohm sys-tem, VHF -

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FIELD STRENGTH METER 701

Provides audio signalfrom channel measured

A solid-state portable field strength meter,Model 747, reportedly is capable of measuringthe signal levels of all UHF, VHF and FMchannels plus mid -band and super band CATVchannels. The unit is said to be tunable from50 to 260 MHz and 470 to 890MHz. The unitfeatures a single input for the entire spectrumand single knob tuning. A dial light operatesfrom a separate C cell battery, reportedly notaffecting the accuracy of the meter. The meteritself is said to operate from four 9v batteries.To extend battery life, the meter automaticallyturns OFF when the cover is closed. Specifica-tions indicate the accuracy of the meter is± 1.75dB, 50 to 260 MHz and ±3dB, 470 to890MHz over a temperature range from 20°F to 100°F. They also indicate that the meterprovides simultaneous readings in microvoltsand dBmV, with a range from 10µV(-30dBmV) to 1.0v ( +60dBmV). By plug-ging the earphone supplied into the high levelaudio output jack, the technician can reportedlyhear the sound of each channel as it istuned in. Price $450. Jerrold.

AUDIO SWEEP GENERATOR 700

Shows response characteristicsof passive or active circuits

The audio sweep/signal generator, ModelASG-1, is designed for use in the frequencyrange of 0 to 100kHz. With this instrument,the response characteristics of either passiveor active circuits can reportedly be displayedon a standard scope. Specifications indicateboth swept and CW operating modes areprovided and sweep width is variable from afew Hz to 100KHz in a single sweep. Outputis said to be adjustable from 0 to 5v p -p. Asynchronized ramp output, with adjustableamplitude, is supplied for driving the horizontalinput to the scope. If triggered operation isdesired, the generator blanking pulses arereportedly available. Sweep time reportedly isvariable from 20msec to 20 sec for one sweep.Price $195. Rameco Corp.

FOR MORE NEW PRODUCTS SEE PAGE 55

CADDY BAR JR. 702

Features pushbutton operationand automatic 15 min shut-off

The Caddy Bar Jr., Model CG22, utilizing "Perma-Lock"circuits, is small enough to fit in a coat pocket or tube caddy.The unit features pushbutton operation and automatic shut-off, which shuts the unit OFF after 15 min of operation. Alsofeatured is a new built-in preheater for fast warm-up,powered by two mercury cells. The retractable signal leadscan be stored inside the unit. The unit measures 41/8 in. by6 in. by 2 in. and weighs 2 lb. Price $89. Sencore.


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Forthcoming selections are describedin the FREE monthly Club News.Thus, you are among the first to knowabout, and to own if you desire, sig-nificant new books. You choose onlythe main or alternate selection youwant (or advise if you wish no bookat all) by means of a handy form andreturn envelope enclosed with theNews. As part of your Trial Member-ship, you need purchase as few as fourbooks during the coming 12 months.You would probably buy at least thismany anyway . . . without the sub-stantial savings offered through ClubMembership.

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AN EXTRAORDINARY 111


Electronic Circuit DesignHandbook

How to Use Your VOM-VTVM& Oscilloscope CATV System Engineering-

New Third Edition-Abrand-new, enlargededition of the ever pop-ular circuit designer's"cookbook," now con-taining over 600 provencircuits, for all types offunctions, selected fromthousands on the basisof originality and prac-tical application. Nowyou can have, at yourfingertips, this careful-ly -planned referencesource of tried and

tested circuits. Selected from thousands sub-mitted by distinguished engineers, these"thought -starters" are a collection of originalcircuits selected on the basis of their useful-ness. This detailed compilation of practical de-sign data is the answer to the need for an or-ganized gathering of proved circuits . . . bothbasic and advanced designs that can easilyserve as stepping stones to almost any kindof circuit you might want to build. 384 pps.,19 big sections, over 600 illus., 8%" x 11".List Price $17.95 Order No. T-101

Home -Call TV Repair Guide

HOME -CALLTVREPAIR

With this handy, quick -reference home -calltrouble guide, you'll in-crease your ability tocomplete more servicecalls per day. It's ar-ranged in logical ref-erence sections-cover-ing raster, video, chro-minance, and other cir-

GUIDE suit troubles-to guideyou right to the cause.

-- By simply comparingthe symptoms in eachcase with the handy

charts, you'll be guided, step by step, throughquick checks for the most logical causes of anymalfunction. In minutes you'll know whetherthe set can be repaired on the spot or if it's abench job because you'll have your own port-able "memory jogger" right at your fingertips!Specifically planned to serve as an on -the -spot TV repair guide, with numerous quick -reference charts for use by the home -call ser-vice technician. 144 pps., 14 quick -referencecharts. Hardbound.List Price $6.95 Order No. 517

FET Applications Handbook

This revised 2nd editioncontains a wealth ofdata on the FET andits various applicationsin practical circuit de-signs, material pre-pared by some of themost capable engineersin the field. Early Chap-ters delve into current -voltage relationships,application areas, DCand AC amplifiers, volt-age controlled attenu-ators, and limiter and

chopper circuits. Additional Chapters dealwith linear applications, chopper and switch-ing circuits, integrated circuits and photo-FETS. Also FET oscillators, describing vari-ous types and the necessary biasing arrange-ments. Essential design data includes startingconditions, power output, frequency stability.and efficiency. information of immediate valueto anyone looking for FET circuit applications.including numerous practical circuits. 320 pps.,250 illus., 26 Chapters. Hardbound.List Price $14.95 Order No. 240

Whether you want toknow more about howthese instruments work,or how to use them ineveryday applications,this "3 -in -1" guide con-tains the answers.Moreover, it will be oftremendous valte inhelping you select theinstruments best suitedto your individualneeds. Part I deals withthe VOM-how itworks, general guide-

lines for using a VOM, and how to use theVOM in troubleshooting all types of circuits,with step-by-step procedure charts you can re-fer to. Part II discusses the VTVM-describingfunctions, applications in troubleshooting, andservicing with the VTVM, pointing out appli-cations where it is unique as a measuring de-vice. Step-by-step servicing procedure chartsare included. Part III discusses the oscilloscopeand its applications in troubleshooting radioand television circuits. 192 pps ; 120 illus.List Price 56.95 Order No. 438

Electric Motor Test & Repair

A guide to maintenancepractices for all typesof small horsepowermotors. While many ofthe larger motor repairshops find it snore ex-pedient to replace lowhorsepower units. re-winding of small elec-tric motors is still awide -spread and profit-able practice. Thispractical guide containsa wealth of informa-tion on testing and re-

winding small motors of every type, includingfan, starter, polyphase, capacitor, induction,synchronous, etc. Early chapters tell you howto set up a motor test panel, make general testsand measurements, and advise you about thetools and equipment necessary (such as an ar-mature winder, wedge driver, cutting andgauging board, coil taper, puller plate, etc.).160 pps., 102 illus. Comb -bound with softcover.

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How To Fix Transistor Radios &Printed Circuits

Here it is I Just off thepress-a completely up-dated, revised edition ofLeonard Lane's best-selling classic on tran-sistor radio repair. Inaddition to extensiveenrichment of the firstedition, the authorbrings FETs, zener di-odes, FM radios - infact, everything relatedto the current state ofthe art-into the pic-ture. Here's the perfect

reference and guide for electronic technicianswho need to understand and repair semicon-ductor circuits efficiently. For those interestedin transistor physics, fundamentals are em-phasized in the first two chapters. The real"meat" begins in Chapter 3 which will thor-oughly familiarize you with amplifier funda-mentals, basic circuit configurations, biasing.FETs, JFETs, and IGFETs. The next twochapters will acquaint you with RF and IFamplifiers. 256 pps., over 150 illus., 12 Chapters.List Price 57.95 Order No. 504

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Third Edition. RevisedThird Edition of theaccepted technical Stan-

; dard of the CATV in-dustry ... an expandedand revised version ofthe first and onlyauthoritative book onplanning, designing,and operating a CATVplant. Covers systemscomposed of uncorrelat-ed components as wellas fully integrated sol-id-state plants. Sub-

jects covered include disadvantageous ampli-fier design concepts, high level distribution,principles of cable powering, amplifier andsystem dynamic range, cascaded figure ofmerit, system operating levels, jumper cables,equalization and alignment, and a host ofother vital subjects, including how to modern-ize older systems using the newest equipmentavailable. 256 pps.

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Semiconductors From A to Z

Here it is-everythingyou need to know aboutsemiconductors - frombasic diodes and tran-sistors to FETs, MOSFETs, tunnel diodes,integrated circuits, var-icaps, photoFETs, light-sensitive and light -emissive devices, in-candescent and lumi-nescent optic -electroniccircuits, unijunctiontransistors, field-effect

diodes, SCR and zener diodes, etc. Explainshow these carious devices work and how theyare used, with descriptions of all the commonand unique circuits used in modern semicon-ductor technology. Attention is given to inte-grated circuit applications - variable -currentand constant -current sources, unbalanced dif-ferential amplifiers, IC applications in FM andTV receivers, TV sound circuits, discriminatorcircuits, and cascade amplifier networks. 272pos., over 300 illus., 26 Chapters.List Price $7.95 Order No. 493

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RCA Monochrome TV ServiceManual

Covers 33 RCA black -and -white models from1964 to current chassis-KCS136 to KCS178-packed with vital ser-vice data regarding ad-justments, alignment,and troubleshootingtips. Initial chapterscover tuners, IF repairand alignment, videocircuits, AGC and synccircuits, sound circuits,and vertical and hori-zontal sweep systems,

with emphasis on newer solid-state circuitsused in hybrid and all -transistor receivers. Theremainder of the manual, chapters 9 through23. deals with specific chassis. In each case.there are chassis layout drawings, circuit boardcomponent location diagrams, specific informa-tion relating to construction and adjustment,plus a wealth of case -history troubleshootingdata. Includes especially helpful data on smallportable and compact models. 176 pps., 81/2 x11. Over 150 illustrations.

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From Antenna!'to Wall OutletsKAY-TOWNESMakes Everything!

One supplier, one distributor can give you acomplete line of high quality systems andcomponents for better TV pictures andbrighter sales pictures!

FROM DESIGN TO DELIVERY,IT'S KAY-TOWNES ALL THE WAY ...Every Kay -Townes product is researched anddeveloped by our own staff in our own labora-tories. We even design the machinery neededto make our products. Every item we make ismanufactured under rigid quality controlsentirely within our own plant. Many of ourcustomers receive their shipments in ourown Kay -Townes trucks! When you buy aKay -Townes product, you can sell it with theconfidence that you are handling a pre-cision engineered item manufactured bycraftsmen!

SEE OUR COMPLETE LINE, INCLUDING:ANTENNAS All -Channel TV and FM Antennas Area Special Antennas for your Location Antenna Switch-Splitters Hi -Carbon Golden Masts ... telescoping or

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WRITE TODAY FOR OURCOMPLETE MATV ANDANTENNA CATALOGS

KAY-TOWNESP.O. Box 593 Rome, Georgia (404) 235-0141


38 ; ELECTRONIC TECHNICIAN/DEALER, AUGUST 1971

ELECTRONIC TECHNICIAN/DEALER AUGUST 1971

MATV Made Simpleby Keith T. Peterson

An MATV (Master Antenna Television) system could consist of a singleantenna connected to two TV sets through coaxial cable, or an elaboratearray of stacked Yagi antennas fed through a head end and line ampli-fier system into several hundred TV sets. The demand for these MATVsystems has increased greatly in recent years due to the broad and vary-ing programs of many TV stations. The popularity for these systems inhomes, motels, hotels and apartment houses has made it necessary forsimplicity when designing these various MATV products. By followingsome simple instructions and using the diagrams provided in this arti-cle, an electronic technician can make such installations with little orno past experience.

Fig. 1 -82 -channel, 2 -set system

XF-35 BandSplittersr.

A 11

CT -300UHF -VHF -FMAntenna

AB -5100AntennaMountedAmplifier

TV -FM

Fig. 3 -82 -channel, 2 -set system.

CPC -24GUHF -VHF -FMAntenna

' ' '-... AB -4700.

. TandemAmplifier

XF-32Band Splitterwith FM Tap

If

FM

Fig. 2 -82 -channel, 1 -set system, plus FM.

41.C-IGUHF

AB -4500DistributionAmplifier

CP-19GVHF -FM

_AM -75 Antenna Mixer

ru

TV o FM SETS

XF-35BandSplitter


The simplest system (Fig. 1)would consist of an all -channel an-tenna (Channel 2 through 83, plusFM) mounted with a rotor on apush-up mast or tripod. An 82 -channel matching transformer,mounted on the antenna terminals,enables the installer to use RG-59/U or RC -11/U coaxial cabledown to a two-way hybrid splitter.At the back of the TV sets, 7512UHF/VHF bandsplitters may beused to match the impedance of thecoaxial cable into a 30012 splitternetwork to the terminals on theback of the set. Following the in-structions supplied with the variousequipment, makes the installation sosimple that even a do-it-yourselfercould install this system.

In weak signal areas, a tandemamplifier (Fig. 2) should be used.This amplifier consists of two units,a pre -amplifier and a power supplyamplifier. Several TV sets may beoperated with this system, but inthis case only a band splitter with anFM tap is used. This splitter is con-nected to the UHF and VHF termi-nals on the back of the TV set andthen through an FM filter tap sothat an FM stereo system might alsobe operated.

Another simple system for thehome is shown in Fig. 3. This sys-tem is usually operated in moderate-ly high signal areas where weak dis-tant signals are also desired. It con-sists of an all -channel antenna, plusan 82 -channel pre -amplifier withpower supply, and two UHF/VHF75.1/ bandsplitters.

A slightly more complex systemfor operating four TV or FM sets isshown in Fig. 4. An antenna mixer isused tc couple a UHF antenna witha VHF antenna, which are pointed

The author is chief engineer forKay -Townes, Inc.


AB -5800DistribulionAmplifier

HS -4 HybridSplitter

CT -42GUHF -VHF -FMAntenna

HS -2 HybridSplitter

HS -4HybridSplitter

WPS-075 WPS-075Wall Plate Outlets to TV or FM Sets


in the same or different directions.And a 755/ RG-59/U coaxial cableis fed down to a distribution ampli-fier mounted in the attic or base-ment. Feeder lines are connected toeach of the four outputs on the dis-tribution amplifier through coaxialcable to the 7551 bandsplitters oneach of the TV sets, located in dif-ferent rooms.

The best system to use in dealerdisplay rooms, small motels orapartment houses is shown in Fig.5. The antenna array could consistof several antennas pointed in dif-ferent directions connected togetherwith a coupler system, or it could beas shown in this diagram.

A distribution amplifier is used toincrease the gain from the antennaarray to boost the signal throughthe cable into the various hybridsplitters and out of each wallplateto the TV/FM sets. These amplifi-ers are designed to increase the sig-

AB 4600TandemAmplifier

WLT-715

WLT-715

WLT-715

WLT-710

WLT-710

WLT-710Terminated

CPC -9UHF -VHF -FMAntenna

1WLT-715

WLT-715

WLT-715

WLT-710

WLT-710

WLT-710Terminated

Last wall tap on each trunk line must be terminated with a 75 fI terminator


nal to overcome the losses in thecable and splitting networks withenough gain to produce excellentcolor and picture.

An 82 -channel, 24 -set system us-ing individual line tap offs built intothe wallplates is shown in Fig. 6.Line tap offs are used in these sys-tems because of the low insertionloss on the trunk line and to in-crease isolation between TV sets.These two features are very impor-tant in a large system. Low insertionloss minimizes the amount of signalloss in the trunk line per tap off.High isolation between outlets pro-hibits one TV set from interfering

with the other sets on the system.The distribution amplifier shown

in Fig. 6 has a built-in four-way hy-brid splitter so that four trunk lines

in different directions,thereby eliminating long lines. Thelonger the trunk line, the greater thesignal loss at high frequencies due tothe RF tilt characteristics of coaxialcable.

Larger systems can be designedusing the various MATV buildingblocks shown in Fig. 7. In this case,a high -gain amplifier is used in con-junction with four two-way splitters,giving the system eight trunk lineswith various isolation line tap offs.

TOVHFSTATIONS

A UHF VHFMIXER BOOSTER

TO*UHFSTATIONS

Al4KoriVIR IP O.TO

UHF VHF FMSTATIONS

B

CP7

" TO VHF

STATIONS

CT -30

UV UVCOUPLER BOOSTER

C

TO UHF-VHF-FM STATIONS

TO UHF-VHF-FMSTATIONS

UV UVSTACKING FOR ULTRA FRINGE

AND HARD LOCATIONS

Fig. 8-Mixer/coupler/signal-doubler systems.


PRO-51-UGUHFAntenna AM -75 Antenna Mixer

MS -2

WLT-715

WLT-715

WLT-715

WLT-710

WLT-710

WLT-710Terminated

AB -9400DistributionAmplifier

HS -4 Hybrid Splitter HS -2 Hybrid Splitter!Nt

-ar-Agelleste-111"1-111-1"=P.Pzyt=-r

CP-36GVHF -FMAntenna

HS -2

Last wall tap on each trunk line must be terminated with a 75 11 terminator

WLT-715

WLT-715

WLT-715

WLT-710

WLT-710

WLT-710Terminatec


Different isolation tap offs areused to compensate for cable lossand insertion loss as the signalsreach the end of the trunk lines. Inthis case, higher isolation tap offsare used towards the front of thesystem where there is more signal,and lower isolation taps at the endwhere there is less signal.

Two important points to keep inmind when laying out and installingMATV systems are the input level(how much total signal is going intothe amplifier), and the amount ofsignal you have at the highest chan-nel at the end of the trunk line.Read the specifications on the am-plifier you wish to use and do notexceed the maximum input signalfor that amplifier. Make sure thereis enough amplification at the high-est channel you are receiving tocompensate for the losses throughthe system.

To simplify MATV systems evenfurther, some special products havebeen designed (Fig. 8). Twin -inputboosters can be used to stack an-tennas and amplify the signals at themast. Fig. 8A shows a UHF antennacoupled to a VHF/FM antennathrough an 82 -channel mixer boost-er. Two antennas pointed in differ-ent directions are coupled throughan all -channel booster (Fig. 8B). Indeep fringe areas, two UHF/VHF/FM antennas are stacked and coup-led into an 82 -channel amplifier(Fig. 8C). Other special compo-

nents-such as antenna mounted30dB FM traps, antenna mounted30012 to 7552 matching transform-ers, special single -channel traps andmultiple attenuation H pads-areshown in Fig. 9.

There are many types of coaxialcable on the market that are notsuited for 82 -channel MATV sys-

tems. After many tests and evalua-tions, it has been found that thefoam -filled, large -diameter, center-conductor coaxial cable with braid-ed shield and outer aluminum foilshield is excellent for these types ofsystems. Usually RG-59/U coaxialcable is used in smaller systemswhile RG-11/U cable is used inlarger systems where there are longruns to be considered. Caution mustbe taken when selecting the cable.

MATV is not really complicatedif you consider each component asa building block. The individualproducts have their function and aredesigned to fit the next componentin the line.

Most manufacturers have engi-neering services for the larger sys-tems. If you think a system may betoo complicated, send the specifica-tions to the manufacturer and hewill lay out the system in block formfor you-usually free of charge.

In most cases, the simple dia-grams shown in this article will cov-er your needs. Follow the block dia-gram and read the instruction sheetssupplied with the equipment. Sim-plicity in design will help you be anexpert in MATV systems.

Ant. mixerAM -75

Matching X -formerX F -37 Singe

Ch.Trop

uMf WM,y-

MatchingX -former

XF -34

ti

1T -1340-7

Hybrid SplitterH S -2

\41

Ltd

Fig. 9-0ther special MATV system components.


How to Exorcise City and Suburban Ghostsby Lon Cantor

In medieval days, a common practice was to exorcise ghosts by meansof rituals and incantations. In this electronic age, we are still plaguedby ghosts-on our TV screens. The problem is especially acute in cityand suburban areas, where tall buildings, water towers and hills makeexcellent TV -signal reflectors.

Fig. 1-Because signal reflection from tall building arrives at home antenna later than direct signal, it causes "ghost" image displaced to the right of direct image.

Fig. 2-Metropolitan "ghost killer" antennas, such as the Channel Master Coloray shown, rejectsignals which approach the antenna from the side.

As Fig. 1 indicates, ghosts aremost commonly caused by signalsarriving at the receiving antennasfrom two different directions. Theproblem is that the direct signalreaches the TV set a split second be-fore the reflected signal. In the shorttime it takes a TV signal to travelan extra half mile, the horizontal os-cillator has caused the sweep tomove about 1/2 in. across a 21 -in.TV screen. Thus, if the reflectedpath is half a mile longer than thedirect path, you get a ghost dis-placed about 1/2 in. to the right ofthe direct image.

Ghosts are annoying enough inblack -and -white, but in color theyare intolerable. Even more annoyingthan horizontal displacement is theintroduction of extraneous colors.Because the reflected signal arriveslate, it generally arrives out ofphase. Since color signals are detect-ed in phase, the ghost signal is col-ored differently than the direct im-age.

Directional Antennas RejectReflected Signals

The key to eliminating ghosts isto reject reflected signals. This canbe done with a good, highly direc-tional antenna. Generally speaking,the more elements an antenna has,the more directional it is. You caneliminate city and suburban ghostspretty effectively with a large, fringearea yagi or log periodic antenna.

Unfortunately, few customers arewilling to pay for a large, high -gainantenna when they live relativelyclose to the transmitter. A better an-swer is to use a metropolitan anten-na specifically made to reject signalsfrom the side and rear.

One of the many good metropoli-tan ghost -killing antennas now onthe market is the Channel MasterColoray, shown in Fig. 2. It is phys-ically a very small antenna, withvery low gain. However, accordingto the polar plot in Fig. 3, this an-tenna is very effective in rejectingsignals from the back and sides.


It is interesting how this is ac-complished. Fig. 4 shows that theColoray is basically a two -elementphased array, with transposed feed.A signal coming in from the frontof the antenna is intercepted byDipole 1 and then Dipole 2, in thatorder. The signal intercepted byDipole 2 has travelled distance Sfurther in space. Therefore, it is outof phase with the signal interceptedby Dipole 1.

However, the signal from Dipole2 is transmitted back to Dipole 1through a transposed phasing har-ness, which shifts it 180° plus S.The two signals are then combinedat Dipole 1 (added vectorially) andfed down the transmission line tothe TV set. Since the signals are not180° out of phase, they do not can-cel each other out.

Now, let us look at a signal ap-proaching the antenna from therear. This signal is intercepted firstby Dipole 2 and then by Dipole 1.The Dipole 2 signal is fed to Dipole1 through the phasing harness,which shifts it 180° plus S. Howev-er, since the Dipole 2 signal startedat S distance behind Dipole 1, it ar-rives at Dipole 1 exactly 180° outof phase. (Notice that this relation-ship holds true regardless of fre-quency and regardless of the valueof distance S.)

If the signals from Dipole 1 andDipole 2 are equal and 180° out ofphase, they cancel out. The phasingarray just described insures that thesignals will be 180° out of phasewhen the signals approach from therear, but their amplitudes are sel-dom equal. Therefore, completecancellation, resulting in a very highfront -to -back ratio, is unlikely.

However, this antenna utilizes avoltage and impedance balancingpower equalizing circuit built arounda duplex ferrite toroidal core (Fig.5). This circuit insures that the sig-nal amplitudes of the two dipolesare equal under virtually all condi-tions.

Installing the AntennaBecause of its size, this antenna

is relatively easy to install. Theauthor and a friend recently clearedup a severe color ghost problem byputting up this antenna on a typicalsuburban New Jersey home. The

CHANNEL 9

FRONT -TO -BACK -10 0-70-1FRONT-TO-SIDE-BETTERTHAN 300 -TO -1

Fig. 3-Polar pattern of Coloray indicates thatat Channel 9 it 3rovides a front -to -side ratioin excess of 30-10-1.

Fig. 4-Ghost killing capability is achievedthrough combination of phased dipoles and

signal power balancing circuitry.

antenna is used to feed Channels 2,4, 5, 7, 9, 11 and 13 to a color -TVconsole.

In making this installation, weused a chimney mount with a 5 -ftmast. There was no point in goingup any higher since signals from allchannels are strong. Our problemwas signals from several directions,rather than not enough signal. (Infact, we would have installed theantenna in the attic-a good placeto keep it out of the elements-if wecould have oriented it properly inthat confined space.)

Because the antenna was quitelow and well supported, no guywires were necessary. We chose co-axial cable rather than twin lead,to avoid direct signal pick up as wellas standing waves.

In a strong signal area, unshield-ed twin lead itself picks up a fairamount of signal. Thus, you can takepains to eliminate a ghost signal atthe antenna, only to pick it up onthe downlead.

ToAntenna

Front

7511Ground

300n 3000/750Out put to TV Set

Fig. 5-Schematic of Coloray power balancingcircuit.

Standing waves on the twin leadare another common cause of colorghosts or smears. In spite of thecareful use of standoff insulators, itis very difficult to avoid runningdownlead across an aluminum gut-ter or near metal of some kind. Atevery point where twin lead is closeto metal (including metal standoffsand the staples commonly used torun twin lead indoors), the signal"sees" a "lump," or impedance mis-match in the line. Some of the en-ergy bounces back off the lump andheads back to the antenna, settingup reflections or standing waves.These reflections bounce aroundwithin the downlead, eventuallyreachirg the TV tuner late enoughto cause closely spaced ghosts,which are seen as indistinct colorsmears.

Coaxial cable minimizes the pos-sibility of standing waves, as well asdirect pickup. We connected thecoax to the antenna through a snap -in matching transformer, using sili-

continued on page 67


Semi -Tipsby Jack Jaques

The second in a series that isintended to clarify and simplifythe useage of specific semicon-ductors. This month's articlerefers specifically to the siliconzener diode, some of its uniquecapabilities and how to usethese devices properly.

Basically, the silicon zener diodeis a simple P -N junction device (re-fer to the first article appearing onpage 50 of the June 1971 issue ofELECTRONIC TECHNICIAN/DEALER)that is connected into a circuit insuch a manner that it is reverse bi-ased. All P -N junction diodes exhib-it a very low forward -bias resistanceand a very high reverse -bias resis-tance. However, all reverse -biasedP -N junctions have a critical voltagepoint or avalanche phenomena atwhich the resistance becomes quitelow and reverse current through thediode increases very rapidly. Thisvoltage phenomena is referred to asthe Zener Point or Zener Knee. Atypical zener diode characteristiccurve is shown in Fig. 1.

In practical applications, the op-timum operating point of the zenerdiode must be considered as the IzTcondition. At this operating point,the Vz will be the rated zener volt-age (plus or minus the actual devicetolerance), and as can be seen fromthe characteristic curve, if the cir-cuit draws less or draws more cur-rent, there is an adequate safety fac-tor so that the zener voltage appliedto the circuit should be maintainedat all times.

Since the usage of zener diodesin original equipment is on a con-stant increase, it therefore stands toreason that their replacement is alsogoing to increase. Because of thisfactor, the electronic technicianshould certainly educate himself in a

The author is HEP technical managerof Motorola Semiconductor Products,Inc., Phoenix, Ariz.

manner that will permit him tomake an adequate replacement thatwill permit the equipment to oper-ate in the intended manner.

Probably one of the least known,or least utilized, features of thesedevices is that when two or morezener diodes are connected in seriesthe zener voltage is additive. For ex-ample, if a 15v, 1w zener diode isrequired, it is possible to connect a6.8v, 1w and an 8.2v, 1w zener di-ode in series; and the results wouldbe a 15v device rated at 1w.

Another replacement technique,that can be used as a matter of ex-pediency, is to place a resistor inseries with a zener diode that has avoltage rating lower than the re-quired zener voltage. While the ex-act resistance value could be calcu-lated by using Ohm's Law, the auth-or feels that the empirical method is

more practical. In which case, a re-sistance substitution box and a milli -ammeter are connected in serieswith the zener diode and a voltme-ter connected across the circuit.Switch the various resistance valuesinto the circuit until the closest volt-age and zener In. are attained-thenreplace the resistance substitutionbox and milliammeter with a fixedresistor of equal value. This resistorshould have the same wattage ratingas the zener diode. Although thismethod does exhibit a slight sacri-fice in regulation, it will be quite sat-isfactory in all but the extremelycritical circuits.

It is hoped that the informationpresented in this article will help topromote a better understanding ofthese popular devices, and permitthe user to interpret and apply thepublished specifications and data.

Terms Used with the Characteristic Curve

ZLis = Zener impedance, in ohms, as measured at a point just after the ava-lanche phenomena has started to cause voltage breakdown of the re-verse -biased junction.

Vz = Nominal zener voltage. This is the rating that is commonly referredto as the zener voltage.

ZZT = Zener impedance, in ohms, as measured at the quarter -power test cur-rent point, I.T. (The "quarter -power" point is the ideal operating pointof a zener diode.)

IZK = The current measured at the same point as Z71,

IZT = The current measured at the same point as Vz and

= The maximum current rating of the specific device.

V

1

1

0

I,

= 450mA

j _.

I

lu/l.. = 5mA l;,

I

1,,, = 1.4AV-. .

0.5

Z/ I1.

1.30 20 10

Reverse VoltageVu (volts)

0

0 0.5 1.0 1.5

Forward VoltageVu (volts)

c) E

cc

Fig. 1-Characteristic curve of a typical zener diode.

44 I ELECTRONIC TECHNICIAN/ DEALER, AUGUST 1971

Understanding Today 's

Capacitorsby Richard Marsh

Part I I --The electrostatic capacitor is quite

different from the electrolytic, both in the way it is

manufactured and in its application

Unlike the electrolytic capacitor,the electrostatic types (impregnatedpaper, film, mica, ceramic and air)can be built to very close tolerances.The dielectric material is generallyof uniform thickness, and once amachine is set-up or materials cutto specific sizes, thousands of capac-itors can be made at a time and allwill be close to their designed ca-pacity. Electrostatic dielectrics aregenerally quite stable and exhibit ex-tremely high electrical resistance.

The tolerance of electrostatic ca-pacitors are generally assumed to be± 10 percent, unless otherwise notedor specified. This is quite unlike itselectrolytic counterpart, which canbe as much as 150 percent over itsprinted label. Many electrostatic ca-pacitors, such as micas, are built toextremely close tolerances and thenselected, bridged and labeled asclose as ± 0.25 percent. Consumerelectronic equipment rarely de-mands better than ±5 percent.

Ceramic capacitors offer uniquecharacteristics-such as changing incapacity as the temperature varies.This can be either in a positive or anegative manner, depending on themixture of materials used in theirfabrication. Temperature compen-sating ceramic capacitors find pop-ular application in tuned circuits--adjusting them as the environmentaltemperature changes. Ceramic ca-pacitors with zero temperature co-efficient exhibit little or no changewhen exposed to varying tempera-tures.

Mica and ceramic capacitors of-fer extremely low inductance, mak-ing them quite effective in high -fre-quency circuits. Mica was one of the

Richard Marsh is distributor market managerof Cornell Dubilier Electronics. There heis responsible for the design of the CDE

Replacement program, including the newtype of wide -range electrolytic capacitor.He joined CDE five years ago after com-pleting, for them, a consulting assignmenton distributor -dealer marketing. Included

was an extensive survey of hundreds ofelectronic technicians in person throughout

the country. Mr. Marsh has owned andoperated electronic distributor and dealerorganizations, was with P. R. Mallory Co.

for eight years and has instrected inmilitary and civilian electronic schools.

first dielectrics used in capacitors. Itoffers extreme stability and preci-sion ratings. The dipped mica ca-pacitor is the most popular in usetoday, obsoleting the early moldedtypes. The radial leads of the dippedmica capacitor adjust to almost anytype of circuit board or chassis con-figuration.

Many ceramic capacitors can bedirectly -eplaced with dipped micatypes-assuring better performanceand dependability. However, thisdoes not apply to temperature -com-pensating applications!

Impregnated paper is one of theearliest dielectrics used. But unfor-tunately paper has very little mois-ture resistance, and even with oiland wax impregnation and filling, adanger of leakage always exists. Byemploying expensive construction-using metal and glass-the papercapacitor can be a very effectivecomponent.

The introduction of films, such asMylar* and polycarbonate, has beenan important contribution to theconstruction and dependability ofelectrostatic capacitors. They offera moisture impervious dielectric atlow cost, making possible relativelyhigh capacitance and simple con-struction. Film capacitors do notalways require an outer container orspecial seals, but often must be de-rated for ac applications. In OEMdesign, where the parameters areknown, an engineer can specify theuse of pure film capacitors andachieve quite a savings in the cost ofmanufacturing a product.

Paper -film type capacitors havebecome very popular. Combiningboth impregnated paper and a film,a combination dielectric is formedthat offers most of the advantages ofeach. The paper -film capacitor hasbecome very popular in the replace-ment field, as it is a perfect substi-tute for both paper and film com-ponents. Many industrial and OEMapplications use these capacitorswhere intermittent alternating cur-rents are likely to be encountered.

Where a paper dielectric is used,even in combination with film, it isessential that moisture be eliminat-ed and prevented from returning.Moisture is extracted from the fab-ricated unit and impregnated withoils and wax to prevent its return.Encapsulation is mandatory. Usual-ly a dipped epoxy cover or a moldedplastic cover is provided, but formore demanding applications metalor ceramic containers are required.

In an effort to achieve extremelysmall sizes at very high capacity rat-ings, a process called metalizing is


AUGUST 1971, LECTRONIC TECHNICIAN/DEALER 45

Service Training SchoolsTV -set manufacturer helps

train nation's electronic technicians

Can a woman do a better job atTV servicing than a man? Maybe-maybe not. But recently a 17 -year -old electronic technician, a girl,proved that women have what ittakes to do the job. The young JobCorps graduate in electronics aver-aged 90 in final exams she took atMagnavox's Service Training Centerin East Rutherford, N.J. She admitsthat she made the most of her on-the-job training as a TV technicianat Regal Magnavox Home Enter-tainment Center and that she did alot of homework if only because shewanted to prove that a woman could

pass the tests with flying colors.Female students are a rarity at

Magnavox's seven regional servicetraining centers. For the past threeyears, the unique regional trainingprogram has been giving, at nocharge, technical training that can-not be presented in field trainingsessions. The centers are located inEast Rutherford, N.J.; Atlanta, Ga.;Westlake, Ohio; Skokie, Ill.; Dallas,Texas; and San Francisco and Tor-rance, Calif. Courses are open to allqualified TV and stereo servicetechnicians.

The program-facilities, instruc-

_.Magnavox Service Training programs are arranged to provide the highest degree of theoreticaland practical training in a minimum number of hours.

Working with actual equipment during class is an essential part of the courses offered at Mag-navox's Service Training Schools.

tors and equipment-are arrangedin such a way that the technician isable to gain the highest degree oftheoretical and practical training inthe minimum number of hours. Fivetraining programs, consisting of twoor more complete courses, arescheduled Monday through Thurs-day. A class day begins at 8:00 a.m.and ends at 5:30 p.m.-with a com-plimentary lunch provided.

The study programs, with someoverlay in courses, are set up so thatthe student can select the one mostbeneficial to him. Progress is gaugedby workbooks and quizzes. The pro-grams, and their included courses,are: Color TV I, courses 120, 202,and 203; Color TV II, courses 202,203 and 502; Color TV III, courses203 and 204; Solid State courses130 and 302; Fundamental Colorand Solid State courses, 110, 120and 130.

Course 110-Technical Indoctri-nation-provides background onMagnavox, its facilities, services andproducts. It covers product identi-fication, service manuals, replace-ment parts, etc. This course is sug-gested for new dealers and new ser-vice personnel.

Course 120-Basic Colorimetryand Color -TV Set-up-is for ser-vice technicians without prior colorexperience. This course covers de-gaussing, purity, color temperature,convergence and all other field ad-justments.


A service training specialist at Magnavox'sEast Rutherford, NJ. Service Training School,gives some personal instruction to the student.Classes are limited in size so that instructorscan take time out to help individuals on spe-cialized programs.

46 I ELECTRONIC TECHNICIAN, DEALER, AUGUST 1971

Servicing the Auto Stereo Tape Deckby Homer L. Davidson

Useful techniques for improving your competence

in maintaining these increasingly popular car audio systems

Last month's article includessome helpful hints for curing autostereo tape deck speed problemsand problems in changing cartridgetape channels. Suggestions were alsoprovided for effectively cleaning andlubricating these units. This month'sarticle continues the subject by sug-gesting what to check when encount-ering problems in obtaining ade-quate volume, noise and distortion,and defective tape cartridges. Thecase histories that are included inthis article relate to the problemsdescribed in both this and the previ-ous issue.

NO SOUND/WEAK SOUND

The audio circuitry in a tape playmay contain from four to nine stag-es of amplification. Many of thesesolid-state stages are directly coup-led, while the output stages may bedirectly or transformer coupled. Anoise or audio signal generatorshould be used first to isolate thechannel and stage that the troubleis in. Then use a VTVM and transis-tor tester to locate the defectivecomponent. When making in -circuittransistor tests, remove the collec-tor terminal from the circuit of adirectly coupled transistor. Removethe motor belt or disconnect themotor when checking out difficultsound problems.

Intermittent sound problems maybe caused by capacitors, transistorsor printed -circuit boards. Do notoverlook a possible intermittent con-nection leading to the tape head.VOLUME and BALANCE controls alsoproduce their share of intermittentsound problems. Check the RADIO/PLAYER switch for poor switchingconnections in radio/tape-playermodels.

No sound or weak sound may re-sult from defective capacitors, resis-tors or transistors. Locate the weak

stage with an audio- or noise -signalgenerator, comparing each stagewith the other good channel (Fig.1). Dried-up electrolytic couplingcapacitors produce weak stages. Aleaky transistor may produce weakand distorted music. Burned or openbias resistors can also cause weakconditions. When both stages areweak, check for packed oxide duston the tape head. It is also possibleto have a weak channel when thetape head height adjustment is offto one side.

NOISE AND DISTORTION

Noisy and distorted conditionsmay be caused by a dirty or mag-netized tape head, improper adjust-ments, resistors and transistors. Pe-riodically cleaning with a tape headcleaning cartridge will eliminatemost tape head problems. If noisestill exists, isolate the stages byturning down the VOLUME control.Check the pre -amplifier and drivertransistors for noisy conditions. Thetape head should be demagnetizedafter making bench repairs.

Extreme distortion is generallythe result of malfunctions in thepower output stages. Remove andcheck each power output transistorfor leakage. In directly coupled

stages, check each audio -frequencyamplifier and driver transistor forleakage or open conditions. Checkeach base- and emitter -bias resistorto make certain that it is not burnedand has the correct resistance. Lookthe printed -circuit board over care-fully, it is possible to find a burnedsection where leaky or shorted out-put transistors are located.

Improper adjustment of the tapehead may produce weak or distortedmusic. Also, crosstalk is caused byimproper height and azimuth ad-justments of the tape head. Makesure that the tape head is changingchannels properly before makingthese adjustments. A loose capstandrive and tape head assembly canproduce crosstalk and wow condi-tions. In models having outsideheight adjustments, you may findthe adjustment turned way to oneside.

Use a test cartridge to make prop-er height and azimuth adjustments.Start with the tape head in the fore-most top position, and then adjustthe tape -head height screw for prop-er response. The sound will be"clean" and loud on both channelsat adjustment point. Connect an acVTVM across the speaker outputterminals of one channel and adjust

TAPEHEAD

NOISY -NO VOLUME -WEAK VOLUME ---___

PREAMPLIFIER PREAMPLIFIER

MPI IHER

LOW VOLUME DISTORTION

DRIVER

-OP

OUTPII t

01 ITPI IT

Fig. 1-Block diagram of one channel in typical auto stereo amplifier.

AUGUST 1971, iLECTRONIC TECHNICIAN/DEALER 47

the azimuth screw for maximummeter readings. Double check eachchannel for good clean reproduc-tion of music.

TAPE CARTRIDGE PROBLEMS

Many tape problems are causedby a defective cartridge. Insert anew cartridge and see if the playeracts in the same manner. If not, thetape cartridge is defective. A squeak-ing noise can be caused by a dryrubber roller inside the cartridge.The rubber roller is rotating againsta plastic bearing and needs oiling.Place a drop of oil on each side ofthe rubber roller-just a drop. Ascraping noise may be heard whenthe cartridge is not seated properly.

When the tape is pulled from thecartridge and winds around the cap-stan drive, suspect a rough or dirtydrive assembly. Clean off the cap-stan drive and check for parts oftape still around the drive assembly.This condition will even make a newcartridge pull tape. A defective car-tridge may pull out tape or have asticky substance on the tape androller. Be sure that the "A" lead isconnected to the positive terminal,or the tape motor will run back-wards-unwinding tape from thecartridge.

When installing a stereo tape sys-tem, make certain that you observethe proper polarity. Some autos use anegative ground while others use apositive ground. If polarities are notcorrectly observed, transistors andtapes may be damaged. In sometape players, a diode is found tocorrect this situation.

SOME PROBLEMSENCOUNTERED IN THE SHOP

Runs Too FastThe owner of a Lear -Jet Model

AS -831 tape player reported thatthe tapes were running too fast. Surething, when we placed the tape play-er on the bench, it was running realfast. (In most cases the complaintis that the player is running tooslow.)

We checked the motor speed cir-cuit and hoped that the trouble wasthere, as some tape motors are dif-ficult to obtain. The motor controltransistor (GC4045) was checkedin the circuit and appeared open

-]SPEED

4.7 pf/REGULATOR2N3702

10K

OUTPUTMOTOR

GC4045

BROKEN TIE WIRE

- OPEN

IN'TO MOTOR6.4v

12v 12v

47011

1 lv

12v

BIASREGULATOR

F g. 2-Schematic showing problems encountered in a Lear -let Model AS -831 tape player.

180n

DRIVERSM4547

47n

MOTOR REGULATORSP441

C

I

TRANSIENTDIODE

MOTOR AND GOVERNORREGULATOR

11 7v

'

Rude

Fig. 3-Schematic of a Ford Model T65MF tape player that ran too fast.

(Fig. 2). Replacing the transistorwith an RCA SK3009 transistorsolved the too -fast -speed problem.

Intermittent SpeedA Ford Model T65MF tape play-

er came into the shop having an in-termittent -speed problem. Some-times the player would run veryslow and then too fast. At first wesuspected a frozen or binding cap-stan drive or stretched rubber drivebelt. Cleaning and lubricating thecomplete player, however, did notsolve the problem.

We checked voltages in the motorregulator circuit and the only incor-rect voltage-11.5v-was found atthe collector terminal of the motor

regulator transistor (Fig. 3). Weremoved the power transistor andit checked good. The motor tran-sient diode was checked while thetransistor was out of the circuit andit was also good. With an in -circuittransistor test, the drive transistorwas found open. If possible, replacethese regulator transistors with theoriginal part number, although anRCA SK3025 universal transistorsolved this intermittent speed prob-lem.

Wow ConditionsThe complaint given for an Auto-

matic Model GES-6394PAK tapeplayer concerned "slow and wowconditions." This sounded like a

48 I ELECTRONIC TECHNICIAN DEALER, AUGUST 1971

TROUBLE CAUSES OR SERVICING PROCEDURE

Fails to play Check fusePoor groundDefective cartridge switchFrozen capstan bearingBroken drive beltMotor defectiveBroken power connection on printed -circuit board

Does not Check manual channel selector switchchange channels Check automatic channel selector switch

Indicator arm bindingPawls out of lineHead index cam frozenSolenoid defectivePower not getting to solenoidPlunger not fully engagedBlows fuses when changing channels (check diode

across solenoid winding)

Tape Plays Belt slippingSlow or erratic Misaligned capstan drive assembly

Oil on belt and capstan driveDry capstan drive bearing

Unbalanced Check tape headaudio output Check balance control

Check for poor speaker groundCheck for incorrect height adjustmentCheck for weak stage

Noisy Check to see if noise is on both channelsCheck to see if transistors in last two stages

(audio and output) are noisyCheck for ignition noise, installing capacitor on

ignition coil or suppressor in distributor leadCheck playback head and demagnetize

Wow conditions Defective capstan bearingDefective motorDry pinch rollerCheck electronic speed circuitryDefective cartridge

No sound or Dirty headweak sound Head out of alignment

Defective cartridgeCheck terminals on tape head with audio -signal

generator to see if heads are defectiveUse audio -signal generator to locate dead stages

Distorted sound Dirty headCheck bias adjustmentsCheck power output transistorsCheck for burned bias resistorsLocate with square -wave generator and scope

MOTORFIELD

liq TRANSIENTDIODE

Fig. 4-Leaky or shorted diode across motorwinding makes motor run backwards.

good clean-up and lubrication proj-ect. A new cartridge was insertedand it started off very slowly. Whilebeginning to clean the capstan driveassembly, we found a loose bearing.A top nylon bearing had worked up,letting the capstan drive assemblybecome loose-causing wow condi-tions. The nylon bearing was presseddown, even with the drive spindle,and the speed was restored to nor-mal.

Dead MotorA Lear -Jet Model AS -831 tape

player came in with a "dead motor."The motor windings checked out,but it still would not rotate. The col-lector terminal of the speed regula-tor transistor was removed and thetransistor tested in the circuit. Thetransistor tested good; and when thecollector terminal was restored, wefound a broken tie wire betweentransistors (Fig. 2).

Erratic SoundThe owner of this Automatic

tape player, Model GE6-6394, com-plained that when the car hit abump or went over rough roads, thesound would cut louder and softerin the left speaker. We placed thetape Player on the bench and re-moved its covers. When pressingaround near the VOLUME control,the sound would act up. We locateda hair -line crack near the dualground connections for the VOLUMEcontrol on the printed -circuit board.

Pulling TapesA Borg-Warner Model 3800 tape

player came into the shop whichpulled tapes. Sure enough, whenconnected to the bench power sup-ply, the tape ran backwards. We re-checked the power supply connec-tions, and it was hooked -up withcorrect polarity.



Color Television Reception- Part IVThe Color Picture Tubeby William Spero

Shadow -masked, three -gun, color -picture tubes

are at present most widely used for the color presentation

of a televised scene

Previous articles in this serieshave described the nature of a col-or -TV signal and resulting antennarequirements, compared circuitsused in both color- and B/W -TVsets, and covered the special circuitsrequired for color -TV reception.This article concludes the series witha description of CRTs capable of re-producing either full -color or mono-chrome pictures (Fig. 1).

The three guns in this CRT arepositioned so that their electronbeams converge as they pass througha perforated shadow mask. This

mask is about 1/2 in. from the phos-phor -dot screen. The output fromthe red, green and blue guns excitetheir respective phosphor dots-producing a picture as the screen isscanned. The shadow mask is com-posed of approximately 375,000 dotholes or apertures; while the phos-phor dots are arranged on the backof the tube face plate in triad groupsapproximately 0.029 in. apart.There are approximately a millionphosphor dots in a color -TV CRT(Fig. 2).

As the electron beams emerge

PURITY RINGNACRE T

BASE

S LUE GUN LATERALCONVERGENCEMAGNET

41b

TRIPLE ELECTRON GUN

Bi uE GREEKR. RED

RADIALCONVERGENCENACRE TS I 31

DEFLECTION YOKE.

APERTURE MASK

ANODEBUTTON

COATINGS

PHOSPHOR SCREEN

Fig. 1-Features at the color picture tube face plate and externally mounted neck assembly.

Fig. 2-Phosphor-dot, electron -beam and shad-ow -mask placement in a color -picture tube.

Fig. 3-Positions of assemblies on the color -picture tube (90° deflection).

Fig. 4-Convergence yoke.


from the back side of the shadowmask, they will hopefully strike in-dividual dots of phosphor. The abil-ity of the red beam to strike only reddots, and the blue and green beamsto strike only their respective dots,is dependent on the purity and con-vergence adjustments made duringthe initial setup in the customer'shome.

The relative placement of the con-vergence assemblies can be seen inFig. 3. The convergence magnetsare directly behind the deflectionyoke. Next is the blue -gun lateral -convergence magnet, and finally thepurity ring magnet. Adjustments aregenerally made in the following se-quence: Purity-usually for a red field. The radial convergence magnetsand the blue lateral magnet. Adjusting dynamic convergence.

These assemblies are placed indiscrete positions over the CRTguns. Incorrectly placed assembliescan make it difficult if not impossi-ble to obtain proper purity and con-vergence. The movement of thebeams, with the convergence yoke,is limited to the following directions(Fig. 4):

Red-Lower left to upper right ina back -and -forth movement.

Green-Lower right to upper leftin a back -and -forth movement.

Blue-Up and down.The blue lateral assembly moves

the blue beam in a horizontal direc-tion. By moving the proper magnets,one can hopefully adjust all beamsso that they converge in the centerof the screen-superimposed tomake a white dot. A "dot and bargenerator" is the instrument usedwhen making these adjustments.

Dynamic convergence is per-formed after static convergence iscompleted. This adjustment com-pensates for misalignment of thebeams at the ends of the picturetube as the face of the CRT isscanned.

If two parallel light beams aremade to swing back and forth at apoint of rotation and are made toscan a screen horizontally, the prob-lem of dynamic misconvergence canbe illustrated as shown in Fig. 5.Note that the red and green beamscoincide at the center of the screen

Fig. 5-Dynamic misconvergence.

to produce a circle of yellow light.However, when the beams swing anequal amount to the left or right,they no longer coincide and sepa-rate red- and green -light circles areformed. The further the beamsmove away from the central posi-tion, the worse this condition be-comes.

In order to correct this conditionand maintain a yellow spot of lightas the platform moves in all posi-

tions, one of the following condi-tions must be met: The swing of thebeam most remote from the pointbeing scanned must be reduced; theswing of the beam nearest the pointbeing scanned must be increased; ora combination of both of these cor-rective measures must be performed.The adjustment for making this cor-rection is called dynamic conver-gence. All of these adjustments arefully described in manufacturers'service literature.

These manuals are printed foryou, the electronic technician, to en-able you to do professional andthorough servicing on the TV sets inyour shop. By making use of thesemanuals, you add another effective"tool" to your service bench.

I would like to thank Gene Nanni,manager of Publications at Sylvania,and his staff, for their continuing ef-forts in making this material avail-able to the industry.

CAPACITORScontinued from page 45

employed. This capacitor is manu-factured by applying molten alumi-num directly on the dielectric mate-rial. This dielectric material is oftenpaper or film. Due to the extremethinness of the aluminum, it is pos-sible to produce capacities otherwiseunobtainable. The metalized capaci-tors are derated, as far as current isconcerned, because of the extremethinness of the conducting material.Applications are generally found inresonant -frequency circuits and cer-tain by-pass and coupling functionswhere maximum currents fall withinthe capability of the component. Asan example, you certainly could notreplace a 2µ,f or 4/11 motor runningcapacitor with a metalized type,since it would almost immediatelyburn up.

Many electronic technicians re-place capacitors with those having ahigher voltage rating to insure long-er component life. Although this isusually acceptable where frequency -sensitive circuits are not involved,often the added thickness of the di-electric may require additional lay-ers-increasing capacitor induc-tance and insertion losses.

It must be remembered that most

capacitors are rated at dc workingvoltages, which means that theymust be derated when used in ac ap-plications. As an example, a 300vsecondary of a power transformerwould have to be bypassed with acapacitor rated at 300v ac. Multi-plying 300v dc by 1.4 gives you anac equivalent of 420v. A 600v dcwcapacitor would be a suitable re-placement.

There are some rules applicableto the replacement of electrostatic -type capacitors that will help youin making the proper selection: DC rated capacitors should bederated for ac applications. Film, paper and combination pa-per -film capacitors can generally bereplaced by dipped paper Mylar*. Capacitors of wrapped, moldedor potted construction can be re-placed by dipped epoxy types. Mica capacitors can be substi-tuted for ceramic capacitors wheretemperature compensation is notcritical. With the exception of frequency -sensitive circuits, it is generally ac-ceptable to replace capacitors withthose having higher voltage ratings. Zero temperature coefficient discceramic capacitors are generally



GUEST AUTHOR

Solid State Replacement - - Problem or Profit?by Jack Devinsky

The rapidly increasing number of solid-state devices being incorporatedin home entertainment equipment can present serious problems for ser-vice dealers-or an abundance of profits. On the one hand, a hit-and-miss approach to solid-state service can lead to frustrating losses inbench time, exasperating call backs, customer dissatisfaction andshrunken profits. On the other hand, a systematized approach using top -of -the -line quality devices specifically engineered for replacement use,ample technical information and accurate replacement data, providesthe service dealer with a straight shot at customer satisfaction andprofits.

The replacement market is mov-ing in two directions-growth indollars and growth in technical so-phistication. End -use purchases ofsolid-state devices for replacementis rapidly approaching a $25-mi1-lion level. Technically, the growthpattern is marked with the increas-ing use of second -generation solid-state devices, such as integrated cir-cuits (IC's) in color -TV sets. TheIC's are replacing discrete devicesand are being used in all types ofcircuits, including RF, IF and chro-ma.

With such increase in market us-age and technical development, theservice dealer must move in theright direction to optimize his timeand his profit.

In solid-state servicing's infancy,some device manufacturers offeredfor replacement use their rejects,culls and other such products, origi-nally intended for hobbyists. Theywere not called out as such, but thatis what they were. The service deal-ers using them, however, soon real-ized the questionable parenthood ofsuch devices and acceptance of themdwindled.

To continue trading in the profes-sional service marketplace, there-fore, some of these manufacturersbegan to provide a higher qualityproduct. Actually, where a recom-mended replacement device mayhave to replace hundreds of industrytypes, the device must be of premi-

um quality with narrowly designedparameters to effect broadest re-placement.

Here is how this is achieved.A family of devices may include

20 different types, depending uponvoltage and current capability, fre-quency response and beta. True top -of -the -line replacement from thatfamily is selected or "creamed"from the top 10 percent of that pro-duction. This, and only this, is pre-mium product, with premium char-acteristics, to serve the broadest re-placement requirements. The ser-vice dealer, in his everyday business,cannot afford to use any but such

Jack Devinsky is manager of ReplacementSolid State Merchandising, RCA ElectronicComponents, Harrison, N.J. He is responsiblefor product planning, and development andimplementation of merchandising programsfor replacement solid state.

premium products. The unwise lux-ury of using a questionable productis just that, a luxury which he cannotafford, since it generates duplicationof effort and losses in time andmoney. As a business man, intentupon maximizing profits, the servicedealer must minimize or eliminatethe use of non-professional devices,just as he must minimize the use ofnon-professional equipment in hiseveryday servicing. He must insistupon premium quality devices fordependability and reliability.

The challenge to realize the bestprofit position encompasses otheraspects as well. How does one in-sure that the proper replacement se-lection is made? This can beachieved best by a manufacturer'soffering of accurate replacementdata-not in terms of numbers ofreplacements carried in a book-butby the accuracy of the book's rec-ommendations. Futile indeed is theservice technician's effort when amanufacturer's recommendationdoes not do the job. Wasted time,wasted effort.

The dilemma can be solved by asystematized approach: Top -of -the -line premium product, ample techni-cal information, accurate replace-ment data, and ample breadth ofproduct line. This is the chain, andany weak link in the structure ripsthe system apart and sets the servicedealer sailing on a sea of potentialproblems.

Solid-state servicing is a dynamic,growing business. It is changing rap-idly-especially in the technical area-and the professional service deal-er intent upon fruitful merchandis-ing of his skills will make the rightchoice. He will elect to use a mod-ern systems approach which incor-porates premium devices specificallydesigned for replacement, ratherthan risk the inevitable frustra-tions.

52 I ELECTRONIC TECHNICIAN/DEALER. AUGUST 1971

TEST INSTRUMENT REPORT

Leader Model LSW-330 Post- InjectionSweep/Marker Generatorby Phillip Dahlen

Incorporates solid-state circuitry for easier handling

A number of articles in recent is-sues of ELECTRONIC TECHNICIAN/DEALER have described the frequen-cy response of the various tuned cir-cuits incorporated in B/W- and col-or -TV sets. They have indicated thatas a result of component aging orreplacement, circuit resonant fre-quencies shift and are no longerproperly aligned for optimum recep-tion.

For this reason, every qualifiedelectronic technician involved in TVset or closed-circuit TV mainte-nance must own some sweep/mark-er generator. Such alignment cannotbe effectively done merely by ad-justing tuned circuits for best sound

(IT V44,4 is 0* ko

or picture quality on the TV set.One new sweep/marker generator

now on the market (Leader's ModelLSW-330 Post -Injection Sweep/Marker Generator) is designed foraligning both TV sets and FM re-ceivers. Specifications indicate thatit can provide six sweep -frequencyoutputs having a central frequencyof 10.7MHz (FM receiver interme-diate frequency), 195.5MHz (Chan-nel 10 frequency), 69.5MHz (Chan-nel 4 frequency), 43.5MHz (TV setvideo intermediate frequency),4.5MHz (TV -set sound intermedi-ate frequency), and 3.58MHz (TV -set chroma intermediate frequency).These signals are reportedly able to

'000 00 31 75 411$ 44.0 41f47 tifZI 44 I% 44 00 OS O% 4 00

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LSW-330

SWEEP/MARKERGENERATOR

Leader's Model LSW-330 Post -Injection Sweep/ MarkerReader's Service Card.

4. :IV:

Generator For more details circle 900 on

sweep up to -± 0.7MHz, ± 10MHz,±-10MHz, ± 5MHz, -± 0.5MHz and± 1.5MHz, respectively. An auto-

matic limit control is said to be in-cluded to provide constant output-signal amplitude, while triangularwaveform voltages reportedly facil-itate sweep linearity.

In addition to switches for pro-viding ± 1 kHz modulation and/or100kHz side markers to the FM

and TV -sound IF sweep outputs;specifications indicate that it hasswitches for applying 39.75 MHz,41.25MHz, 41.67MHz, 42.17MHz,42.67MHz, 42.75MHz, 44.0MHz,45.0MHz, 45.75MHz and 47.25-MHz markers to the video IF sweepoutput; and switches for applying3.08MHz, 3.58MHz and 4.08MHzmarkers to the chroma sweep out-put.

The manufacturer indicates thatthe instrument has a 100mv rmsoutput, when applied across a 75,11load, which can be attenuated 0 to60dB by using both stepped andvariable output controls.

The instrument's internal dc biassupply is said to provide two inde-pendent voltage sources, one pro-viding 0 to ±-50v and the other pro-viding 0 to ±20v.

One unusual feature is said to in-clude variable horizontal and verti-cal outputs for the crystal -controlledmarkers-not only permitting con-trol of marker size, but permittingthe markers to be rotated betweenhorizontal and vertical.

Manufacturer specifications indi-cate that the instrument can be pow-ered by 115/230v, 50/60Hz; mea-sures 57/8 in. H by 12 in. W by 8in. D and weighs 20 lb.


The right replacement, fasterwith

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All contain assortment of the most popularand widely used Centralab components.

All control units (KIT -10F, -20W, -30T)include latest edition of H. W. SamsReplacement Control Guide.

All components are functionally arrangedin drawers by value, type, etc.

All drawers are pre -labeled clearlyshowing contents.

All kits are completely set up,ready to use.

By Centralab, yourParts -Time Helper

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54 IELECTRONIC TECHNICIAN/DEALER, AUGUST 1971

NEW PRODUCTS

For additional information on products described in this section, c rclethe numbers on Reader Service Card. Requests will be handled promptly.

VOM 703

Designed for semiconductortroubleshooting

The VOM, Model 666, is designedfor semiconductor troubleshooting.The unit reportedly offers an input im-pedance of 10M and special resistanceranges-with low voltage drops re-quired for semiconductor testing. TheVOM is said to be warranted to with-stand a 5 ft drop and still continue

to operate. Specifications indicate thatthe unit will withstand 200v ac or dcon any range without permanent dam-age. Other features are said to includediode protection on the meter move-ment, temperature compensation, ex-ternal fuse replacement and a self -storing handle. Other specifications in-dicate sensitivity of 1OM dc, 1OM(47pf) ac, and a current circuit 100-mv drop. The unit weighs under 2 lb.Price $132.50. Weston Instruments.

TOOL CASE 704Contains removableflat tray

An attache case, No. TC-100, is de-signed with three panels and ahinged tool holder, which is attachedinside the lid. The lid may reportedlybe unfastened and placed to stand byitself outside the case. Specificationsindicate that both the tool holder anda removable flat tray, which is storedin the case, have straps and pocketsfor up to 59 individual tools. The bot-tom of the case is said to be dividedinto two compartments to accommo-date kits, test meters, parts boxes and

additional tools. A full width pocketin the lid provides room for servicemanuals, schematics, job sheets andinvoice pads. Xcelite.

INTRUSION DETECTOR 705Operates in an area ofup to 40 ft

The Model 307 radar intrusion de-tector is designed to sense the pres-ence of an intruder entering into itsoperating field. The unit will reported-ly cover a circular area ranging from

a few feet to 40 ft in diameter, de-pending on room conditions and set-ting of the sensitivity control. The de-tector is said to operate on 12v dc at30ma. Specifications indicate thatwhen its radar field is disturbed a relayclosure is generated within the unit,triggering any alarm device hookedup to the detector. This unit can re-portedly be wired directly into anyperimeter system and can be used inconjunction with a wide variety of se-curity controls. Dimensions are 41/2in. by 31/2 in. by 3 in. Price $90. De-tectron Security Systems.

TUNER SPRAYCleans and polishestuner contacts

706

A chemical compound, called Su-per-Lube, has been developed which

is said to foam away corrosion, dirtand oxidation. Specifications indicatethat it cleans, lubricates and restores

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tuners while continually polishingtheir contacts. The manufacturer indi-cates that it will not cause drift or de-tuning, and is non-flammable, non-toxic and harmless to plastic and rub-ber. Electronic Chemical Corp.

DESOLDERING TOOL 707

Removes solder withoutdamage to components

A desoldering tool, Model DS -40,reportedly removes soldered compo-nents without damage to either com-ponents or circuit boards by utilizing

a vacuum and a hollow tip. Specifica-tions indicate that the unit is com-plete with a 40w power handle, vac-uum bulb, a 0.063 in. tip and cord.Replacement tips are available in avariety of sizes. Price $14.50. Weller.


AUGUST 1971, ELECTRONIC TECHNICIAN/DEALERI 55

TECHNICAL DIGEST

The material used in t iis section is selected frominformation supplied through the cooperation of therespective manufacturers or their agencies.

ADMIRALTape Recorder Model CTR 591-Service Hint

If the UP button should be depressed while the recorderis in the leather carrying case, the door will be preventedfrom completely opening. If other buttons are depressed

1505

1215

1208

1306

1204

1302

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1030

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0210

while the door is in a partially open position, it is possiblefor Lever 0730 (under the flywheel) to be bent. Thebending of this lever will prevent the recorder from pullingthe tape through the cassette. To repair, straighten or re-place the lever, 2015A1-183.

Elimination of Objectionable Sound Originating in the Horizontal Out-put Stage

B/W- and color -TV sets generate sound at fundamentaland subharmonic horizontal sweep frequencies. When thissound level becomes objectionably loud, the following stepsshould be attempted to reduce it to an acceptable level.

Substitute several tubes for the horizontal output, damp-er, regulator (if used) and high -voltage rectifier, one at atime, to see if the sound level is reduced. An alternatemethod is to hold an insulated rod against the glass enve-lope of each tube to see if it will dampen the sound. Re-place the tube or tubes which produce objectionable sound.

If the set has a pincushion correction circuit, slightly re-duce the PINCUSHION AMPLITUDE control setting and noteif objectionable sound is reduced. if it is, tighten the trans-former mounting nuts and place tapered toothpicks be-tween coils and core.

With an insulated rod, exert pressure on all mountingscrews, rivets, brackets and hinge pins on the high -voltagecage and door. Any part causing sound can be dampenedby applying a dab of Silastic RTV silicon rubber, Admiralpart 17199-3, or by adding a tab of adhesive tape. If thecage door is found to be the source of sound, add a corkpad or tape to the contact edges of the door assembly.

To eliminate sound caused by the horizontal outputtransformer, carefully move the transformer away from its

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56 ELECTRONIC TECHNICIAN 'DEALER, AUGUST 1971

mounting, just far enough to insert a rubber spacer andgrommets over the transformer mounting screws. Carefullyreinsert transformer mounting screws into the side of thecage. Mounting nuts should be tightened sufficiently to in-sure a secure fit, taking care not to over -tighten them. Turnthe receiver ON and check for corona. (The grommets andspacer are packaged with instructions as 98A147-1.)

To insure good operation and customer safety, it is rec-ommended that the high -voltage adjustment and safetychecks be made as instructed in the service manual.

If these steps do not reduce the sound to an acceptablelevel, replace the horizontal output transformer.

MAGNAVOX

TV Model 15117/2S117-12DEP4 Picture Tube Replacement

Those models using the T917-02 TV chassis employ atype 12DEP4 picture tube. When a replacement picturetube is needed, it is said to be important that you use onlya Magnavox replacement 12DEP4. Physical dimensions forthe 12DEP4 will vary between the different picture tubemanufacturers to the extent that the cabinet back cannot befitted into place if some general replacement types are used.

RCA SALES CORPORATIONC, COS Tuner/Amplifiers-Troubleshooting Methods

1 he following simple noise isolation procedure can savevaluable service time when troubleshooting the C/COSTuner/Amplifier audio circuits. Turn the LOUDNESS con-trol to minimum, and if the noise is not present, thetrouble is probably before the zener Z605wards the tuner). If the noise is still present, then discon-nect the preamplifier -to -amplifier audio cable. If it still ap-pears, the trouble is probably in the power amplifier chas-sis; while if it is eliminated, the trouble is probably thezener Z605.

Semiconductor substrates can be damaged during nor-mal troubleshooting if the technician is not careful. As anexample, the terminal guide shown is of zener Z605, usedin preamplifier chassis RS247 and tuner chassis RC1238.Note the proximity of pins 2 (ground) and 3, and pins 6(ground) and 7. If either pin 3 or 7 is momentarily ground-ed (very easily done with a test probe) the zener circuitrycan be damaged, resulting in a dead channel.

When replacement is necessary, damage to the substrateand/or the printed circuit can be minimized by using agood desoldering tool (a type having high plunger pressureis required). Solder can be removed from each connectionwith the desoldering tool and then the component can belifted out intact.

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. . . for more details circle 104 on Reader Service Card1971

1

ET -81

TV TUNER SERVICEVHF, UHF, FM or IF-Subchassis..

t

4:

You owe it to yourselfto try P.T.S. We are the fastest growing, oldest and now thelargest tuner service company in the world. Here is whatyou get:

I. Fastest Service - 8 hr. -- in and out the same day. Overnighttransit to one of our six plants, for parts, tuners or IF -modules.

2. All tuners cleaned inside and out, repaired, realigned and irtested.

3. On IF -modules all stages checked, all traps set with high calibretest equipment.

4. Fine Quality! Your customers are satisfied and you are notbothered with returning your units for rework!

5. Lower Cost! Up to $5.50 less than other tuner companies!6. Friendly, helpful personalized service!

. . . All Makes

pot..7ast lit service!

1 YEAR GUARANTEE

FIRST TO OFFER 365 -DAY GUARANTEE!COLOR-BLACK & WHITE-TRANSISTOR TUNERS-ALL MAKESGUARANTEED COLOR ALIGNMENT-NO ADDITIONAL CHARGE

We offer you finer, faster...Precision

LIKE TO DO T YOURSELF?PTS makes all tuner parts available to you.Send one dollar (redeemable) for ourTUNER REPLACEMENT GUIDE AND PARTS CATALOG.60 pages of top information Blow-up of all tuners Largestexact tuner replacement guide Antenna Coil Replacement GuideMulti -fit Replacement Tuner Shaft Guide

. for more details circle

VHF -UHF -FM

UV -COMBO

IF -MODULE

$ 9.95$16.95$12.50

Major Parts c-larged at Net Price

CUSTOMIZED REPLACEMENTS AVAILABLEFOR $12.95 UP (NEW OR REBUILT)

For fastest service, send faulty unit with tubes, shields and all broken parts to

PTS ELECTRONICS, INC.HOME OFFICE-P. 0. Box 272-Bloom ngton, Ind. 47401EAST- P. O. Box 3189-Springfield, Mass. 01103WEST COAST- P. 0. Box 41354-Sacramento, Calif. 95841MOUNTAIN- P. O. Box 4145-Den. ('olo. 80204SOUTHWEST- P. 0. Box 7332-Longview, Tex. 75601SOUTHEAST- P. 0. Box 6771-Jacksonville, Fla. 32205

133 on Reader Se'vice Card

Tel. 812/824-9331Tel. 413/734-2737Tel. 916/482-6220Tel. 303/244-2814Tel. 214/753-4334Tel. 904/389-9952

AUGUST 1971, LECTRONIC TECHNICIANiDEALER 59

SCHOOLS ...continued from page 46

Course 203-Color-TV CircuitAnalysis and Troubleshooting-isfor the electronic technician who isnow doing or preparing to do benchwork. It provides detailed coverageof circuit operations and a logicalapproach to troubleshooting band-pass amplifiers and all other colorcircuits. Workshops are provided onadjustments required in color cir-cuits and troubleshooting actual re-ceiver problems.

Course 204-Solid-State Color -TV Circuits-is an extension ofcourse 203, covering the solid-statecircuits in the Magnavox T936 andT950 chassis. It includes work pe-riods and solid-state troubleshootingtechniques.

Course 202-Color-TV Align-ment-teaches how to analyze prob-lems resulting from misalignmentand the use of sweep alignment in-struments as a troubleshooting aid.

Course 130-Solid-State Compo-nents, Their Operation and Applica-tion in Solid -State Radios-intro-duces the theory and operation ofsemiconductor components and cir-

cuitry in radio and TV sets. Circuitapplications and component check-ing are taught by using studentworkboards. The correlation of cir-cuit analysis and symptom analysisis taught in workshop sessions.

Course 302-Solid-State TV Cir-cuitry and Service Techniques-provides a study of solid-state com-ponents in specialized TV circuits,with emphasis on agc, sync, verticaland horizontal deflection, video andhigh -voltage circuits.

Course 502 --Magnavox TV Re-mote Control Systems-provides acomplete study of Magnavox's eight -function remote control.

AUTO STEREOS ...continued Irvin page 49

The continuity of the motor wind-ing was normal and seemed to be inorder. One lead of the transient mo-tor diode was removed and an ohm-meter test showed a leaky condition.Upon replacing the leaky diode, themotor ran forwards (Fig. 4). Sincethen, we have encountered severalJapanese tape players that acted inthe same manner.

/e/eMatic COLOR TESTJIG KIT

. From "Telematic"

NOW . . .

ECONOTEST JIG KITto ServiceSolid StateColor Television

Model:EJ-390 59 Solid State

95 ECONO JIG KITNET Less Picture Tube

Model:EJ-190

9549 NET Less Picture Tube

For Standard Tube Type

ECONO JIG KIT

Also available a complete line of solid state yoke adaptors and cables.

ASK YOUR DISTRIBUTOR FOR INFORMATION

TELEMATIC DIV., U.X.L. CORP., 2245 PITKIN AVE., BKLYN., N.Y. 11207

No Right Channel

In this Lear -Jet Model AS -831tape player we were unable to obtainany sound from the right channel. Aquick signal injection with a noise -signal generator indicated that theright channel was good at the tape -head terminals-both channels hadabout the same amount of gain. Wediscovered that in error the heightadjustment had been screwed tightso that the right channel was off thetape area. Undoubtedly, someonehad tried to adjust the height controlfor channel crosstalk interferenceand went a little too far.

NEW PRODUCTS

continued from page 55

COLD GALVANIZE 708

Protects all metals from rust,corrosion and rust creepage

LPS Instant Cold Galvanize is saidto be a hard coating of 95% purezinc that protects all metals from rust,

INSTANTCOLD

GALVANIZEZinc Rich

corrosion and rust creepage for manyyears. Specifications indicate that it isnot a paint, and unlike skin -type coat-ings it will not peel-actually fusingto iron or steel for protection throughsacrificial galvanic action. It will re-portedly withstand over 3000 hr in asalt spray cabinet. The coating isavailable in 16 -oz aerosol cans and inbulk. LPS Research Laboratories, Inc.

continued on page 64. . for more details circle 125 on Reader Service Card

60 I ELECTRONIC TECHNICIAN; DEALER, AUGUST 1971

Only one van givesyou all these better ideas.

Ford Econoline

Sales leader for10 straight years.

Easy, out -front servicing.Simply raise the convenient outside hoodand your routine service points are right

J at hand: radiator, oil level, battery, wind-shield washer reservoir, voltage regula-tor, wiper motor, brake master cylinder.Better ideas make servicing fast, easy.

Shorter outside, easier to park.Overall length of EconolineVans is significantly shorterthan other makes. This meanseasier parking and better maneuverability in citydelivery operations-time saved on every trip.

Wider at top for built-insBody sides are more vertical,wider apart at top than other vans.So built-in units fit better and leavemore aisle. Modular units, de-signed to fit and work togetherallow you to custom design al-most any interior you need. Jobpackages, such as insulated flo-rist's van, are also available.

Engine clear forwardThe engine is moved for-ward in Ford's clear -deckvan-all the way out of thecargo area. Clear floorspace behind driver's seatmeasures over 81/2 ft. inEconoline Van . .. over 10ft. in the Supervan.

OLD'INTRUDER'

DESIGN

Strong, smooth -ridingTwin -I -BeamThe independentfront suspensionthat has revolu-tionized truck rid-ing qualit,es. Two forged steel I-beam axlesgive it strength .. . big coil springs give it asmoother ride.

3

FORD"CLEAR DECK'

DESIGN

Biggest payload of allHusky construction andlow you to carry a heav-ier load than any othervan. Maximum payloadof 4320 lbs. is largestin industry.

high capacity axles al -

Model

E-300E-200E -I00

Max. Payload

4320 lbs.1800 lbs.1120 lbs.

Max. GVW

8300 lbs.5400 lbs.4500 lbs.

Driver's "walk-thru" to rearEconoline's forward engine position clears the deckfor the driver, too. He caneasily step from his seat intothe rear load area and exitthrough side or rear doors.

See your Ford Dealer andsee all the better ideas inAmerica's best-selling van-Ford Econoline.

FORD (C"--or"v-i-D. for more details circle III on Reader Service Card


Here today in the allnew Messenger 121!

From the engineering that broughtyou the famous Messenger 100 ...a new generation of citizens radioequipment with even greater per-formance! New punch -button con-trols for instant channel selection.Voice tailored audio and acousti-cally isolated speaker for really clearsound. Plus exclusive Johnsonspeech compression circuitry, newceramic filter, and more!

You're going to hearmore from...

JOHNSON ® Waseca. Minnesota 56093


TV TECH SPECIALS

90 Degree Color YokeRepl. Y 109-DY95 AC $8.95Magnavox Yoke #361290

equiv. to DY92AC $8.9520 Assorted Controls $3.9510 IN34A Diodes $1.0020-1 Amp. 1000 PIV (Epoxy) $3.9520-2 Amp. 1000 PIV (Epoxy) $4.956500 PIV Focus Rect. 3 for $2.00RCA COND. AXIAL LEADS50 Mfd. 50 V 4 for $1.00500 Mfd. 50 V 4 for $1.891000 Mfd. 50 V 4 for $2.5040 Mfd. 150 V 4 for $1.2980 Mfd. 150 V 4 for $1.89100 Mfd. 250 Volts 4 for $1.982 Mfd. 450 V 6 for $1.494 Mfd. 450 V 6 for $1.6910 Mfd. 450 V 6 for $1.9816 Mfd. 450 V 6 for $2.2930 Mfd. 450 V 6 for $2.9810 Mfd. 600 V 4 for $2.2920 Mfd. 600 V 4 for $2.69RCA COND. CANS50-30 Mfd. 150 V 3 for $1.29300 Mfd. 150 V 2 for $1.59125 Mfd. 350 V 3 for $1.9880 Mfd. 450 V 4 for $2.39

SEND FOR FREE CATALOGTubes Up To 50% OffMinimum Order $1 5.00

Send Check or M.O.

TV TECH SPECIALSP.O. Box 603

Kings Park, L.I., New York 11754

DEALER SHOWCASE

For additional information on products described in this section, circle

the numbers on Reader Service Card. Requests will be handled promptly.

CASSETTE TAPE RECORDER 713

Features a system to guard againstaccidental erasing

A cassette recorder, Model 1420, issaid to feature a semi -automatic cas-sette insert and a pushbutton cassetteeject. The portable recorder/player isreportedly powered by five 11/2v "C"cells or by ac through an adapter sup-plied with the unit. Specifications in-dicate that the microphone is omni-directional with a remote Start -Stopswitch. A safety system is designed toguard against accidental erasing ofpre-recorded cassettes. The recorder is

said to include PLAY, STOP, FAST FOR-WARD, REWIND, VOLUME and TONEcontrols. A VU meter and batterylevel meter are reportedly also includ-ed. Price $54.95. Norelco.

STEREO TAPE PLAYER 714

Includes AM/FMmultiplex receiver

A solid-state modular, portable 8 -track stereo tape player, Model 2001,is designed with all controls, selectors

and dials positioned on one concaveside of the unit. Specifications indicatethat it includes an AM/FM multiplexindicator lamp, stereo headphone jackand a music power rating of 3w perchannel. The unit measures 12 in. indiameter and has a black face fornight-time selection, plus chromeslide -bar VOLUME, TONE and BALANCEcontrols. The tape player operates onbattery, ac/dc or 12v auto power.Price $160. Weltron.

SOLID STATE ELECTRONIC 715

SWITCH

Extends operation of anysingle -trace scope

A compact transistorized electronicswitch is reportedly designed to enablethe user to extend the operation ofany single trace scope to dual traceuse. The Model LS -5 instrument is

said to have switching frequencies of1.5, 5, 30 and 50kHz and offer a trig-gered output to facilitate fast and high-ly stable synchronization of the ob-served phenomena. A specially inte-grated mounting bracket reportedlyfacilitates direct placement of the uniton any scope to be used. The rated

l ,,--SCi FCTRONIC

SWITCH,00x:I. IIVII

VIII111,

frequency response is dc to 300kHzand 2Hz to 300kHz on ac. The unithas two channel inputs, ac or dc switch -able for each channel. The verticalsensitivity is said to be 0.05v/cm withan input impedance of 1M at 40pf.Gain and positioning controls are in-dividual and wide range for eachchannel. The unit has a 115v/50-60Hz power supply and measures 31/2in. H by 51/4 in. W by 4 in. D. Weight3 lb. Price $69.96. Leader.

TAPE ERASER 716

For hand-held ortable -top use

A double -duty bulk tape eraser,Model 30-140, is designed to be usedon either a table top or as a hand-held

for more details circle 129 on Reader Service Card


unit. It will reportedly magneticallywipe clean audio tape reels, cassettes,cartridges and video tapes. The eraseris powered by standard house currentand is said to draw 4a in operation.

The unit is turned ON with an integralpushbutton switch. A single pass overthe unit by a magnetic tape reported-ly will erase all program material andbackground noise. Price $18.31. GCElectronics.

STEREO HEADPHONES 717

Selector switch permits usewith either a stereo or mono system

A set of stereo headphones, ModelCIS -300, is said to feature a frequencyresponse of 20 to 19,000Hz. Specifi-cations indicate that a 10 -ft coiled ex-tension cord, fitted with a three -socketplug to mate with the three -pin socketof the headphone. has a remote con-trol with adjustable left and rightVOLUME controls. A selector switchbuilt into the control reportedly per-

mits use of the headphones with anystereo or mono audio system. Otherfeatures are said to include an adjust-able foam filled vinyl headband andsoft vinyl covered earphone cushions,which provide an air -tight seal to theear. Price $29.95. RMS Electronics.

--410fr

II MEE II

- ,116

0Pp.

#. 1 40 e., ...

c 4IR-18M

10-102

I ' 5 7'.-... so

.

IB 101

11!t 1166"111111111111.111111161-- ..--..

- .!.

.r.

...!.

Ni - _

IM -105 IB-102

New Heathkit Cost-CuttersHere's happy news for budget -watchers . . a completeHeathkit solid-state test instruments designed to deliver professionalperformance at traditional Heathkit savings.

NEW Heathkit 10-102 5" solid-state scope delivers DC -5 MHz response...AC orDC coupling ..Hi -Z FET input...30 mV/cm sensit vity...continuous sweep ratesfrom 10 Hz to 500 kHz...external horizontal & sync inputs...1 V P -P output...large flat face CRT with 6x10 cm ruled graticule...choice of kit or assembled.Kit 10-102, 29 lbs., 119.95*. Assembled 10W-102, 29 lbs., 179.95*

NEW Heathkit 1M-105 VOM ...8 DC ranges to 5 kV; 7 AC ranges to 5 kV; 6 DCcurrent ranges to 10 A; 5 ohms ranges to x10 k with center scale of 20; 5 dBranges to +50. High impact Lexan'- case & ruggedized taut -band protectedmeter. Exceptional accuracy. Easy assembly. Kit IM -105, 4 lbs., 47.95*

NEW Heathkit 1R -18M solid-state chart recorder...12 pushbutton selectedspeeds...1 mV or 10 mV full scale...full 10" chart width...1 second full scalepen response...3-terminal floating input...240 Hz photo-chopper reduces 60 Hznoise. Fast, easy assembly, rapid paper loadirg. Kit 1R -18M, 14 lbs., 149.95*

NEW Heathkit 1B-101 solid-state frequency counter...1 Hz to over 15 MHzrange...5 digit cold -cathode tube readout...overrange indicator & Hz/kHzswitch for 8 -digit capability...wide range input without adjustment...low trig-gering level...1 megohm input ..rock -stable time base. Kit 1B-101, 7 lbs., 199.95*

NEW Heathkit 1B-102 solid-state frequency scaler...turns virtually any coun-ter into a 175 MHz counter. Scales 100:1, 10:1 or 1:1. Very low triggering level.Easy assembly & operation. Compatible with practically all 1 megohm inputcounters. Kit 1B-102, 7 lbs., 99.95*

FREE '71CATALOG

Describes theseand over 300other Heathkits.Save up to 50%by building them

yourself. Use coupon and sendfor your FREE copy!

rHEATH COMPANY, Dept. 24-8Benton Harbor, Michigan 49022 a Schlumberger companyD Please send FREE Heathkit catalogD Enclosed is $ , plus shipping.

Please send model(s)

NameAddressCity State lip

Prices & specifications subject to change without notice.'Mail order prices; FOB factory. 7E-244

. for more aetails circle 114 on Realer Service Card


NEW PRODUCTSTHE CRIMESTOPPER THAT SELLS!New DeltAlert "double -warning"increases protection for home

and industry at Icwer cost.How? Because the DeltAlert ultrasonic system of-fers a choice of options for burglar detection andalarm, lights and/or a shrieking alarm. Because itcomes in a choice of systems, portable or perma-nent installation. Because it sells at approximately1/2 the price of many more cumbersome units giv-ing similar protection. No wonder our distributorssay "3 out of 5 prospects buy!"

Super DeltAlert Package

'7frtr,*

pa

ONE HOME OUT OF EVERY 6 WILL BEVICTIMIZED THIS YEARNo one knows where crime will strike. No one knowswhose life, family and property will be menaced.With the crime rate so high, and with one familyout of six potential victims of burglary, vandalismor personal attack, everyone needs the peace -of -mind protection of DeltAlert. The portable DeltAlertplugs into any 110 -volt outlet. When traveling, takeit along, use anywhere. If concerned about powershortages, install the permanent Super DeltAlertpackage with 12 -volt standby power supply. Eithersystem reacts the instant an intruder breaks itsbroad -range field of ultrasonic sound waves.Send the coupon today for free sales details on thishigh -profit system.

rA DELTA PRODUCTS, INC . Dept.ETD

P.O. Box 1147, Grand Junction, Colo. 81501

I want to help control the soaring crime rate, andmake big profits, too, demonstrating the new Delt-Alert Protection. Please RUSH free sales details.

Name

Address

City State Zip-J


Now Weller®helps youde -solderfaster andeasier.

COOPER

De -solder and re -solder cleanly with

one hand and with lesschance of heat damage.Stainless steel tube prevents

.1 clogging, and there's a choiceof six metal tip sizes.

For straight soldering, you can'tbeat Weller's 25 watt and 40 watt

professional soldering irons. Theyhave stainless steel barrels, popularpencil shape and double -coated, in-dustrial -grade interchangeable tips.Ideal for service work, kits, hobbies.The Weller de -soldering tool isavailable nationwide through localelectronic parts distributors.

TheCooperGroupCRESCENTKEN-TOOLLUFKINWELLER

.for more details circle 130 on Reader Service Card


continued from page 60

TRANSISTOR ADAPTER 709

Converts a VOM to atransistor/diode tester

This adapter, Model TRA-1, is de-signed to convert a VOM into a tran-sistor and diode tester. Specificationsindicate that PNP and NPN transis-tors, high- and low -power transistors,shorts, leakage, open and current gaincan be tested. It is also said to testdiodes, open and shorts, forward andreverse currents. The switching sys-tem eliminates the transfer of leads.

Other features include a built-in sock-et, plus flexible alligator clip leads fortransistors that do not fit the socket.Price $15.95. Coletronics Service Inc.

CASSETTE TAPE SPLICER 710

Designed for Vs in.

cassette tapes

A cassette tape splicer, No. 30-650,designed for 1/4 -in. cassette tapes, hastwo blade positions-one for cuttingwhile the other provides a tapered

trimmed splice. The splicer is said tohave felt -tipped tape hold-down fin-gers. Price $4.95. GC Electronics.

AEROSOL VALVE 711

Designed for dispensingelectronic chemicals

A valve has been developed whichis said to have three important fea-tures: a large button for finger con-

trot and position direction, heavierspray for fuller application and easierinsertion of the extension tube, whichis needed for pinpoint application.This valve is reportedly incorporatedin special promotional packages forthree chemicals: Ultra Wissh for color

tuners: Miracle Bath for cleaning anddegreasing tuners: and Lubrite, a self -

polishing lubricant for all tuners. A setof miniature tools are said to be alsoincluded in each promotional pack-age. Workman.

METAL CASSETTE 712

Designed to eliminate problemsresulting from static charges

The metal cassette reportedly elimi-nates static charge problems developedin plastic cassettes. The cassette actsas a ground, draining off these charg-es. The manufacturer indicates thatthe metal housing insures precise di-mensional stability and contains twomachined bearing tape guides for ex-act tape location and extremely lowinternal friction. Temperatures andhumidity reportedly do not affect the

stability of the metal cassette. The cas-sette is said to provide more exact tol-erances and decreases flutter and wow.It is available in 60, 90 or 120 minlengths. Auricord Div., Scovill.

WinFabulous Free Giftsselling up to JERROLD antennas & systems

Spectrum '71 is designed to focus your atten-tion on the broad spectrum of JERROLD highprofit "better reception" products When yousell up to the best in antennas and Master An-tenna TV systems, you earn more profit ... plusfabulous free gifts.

Ask your distributor for details on Spectrum'71 or write Jerrold Electronics Corporation,Distributor Sales Division, 401 Walnut Street,Philadelphia, Pa. 19105.

Focusing on one thing...better reception

a GENERAL INSTRUMENT company

... for more details circle 116 on Reeder Service Card


BOOK REVIEWS

EDLYN'S JAPANESE DIRECTORYpublished by Edlyn Directories, paper-bound $2.00

This 13 -page directory providesover 300 addresses for many of themore popular Japanese imports, indi-cating where you may write for sche-matics and technical information. Thelisting is arranged according to theAmerican trade mark on the product,providing the U.S. address of theAmerican distributors.

AUDIO SYSTEMS HANDBOOK byNorman H. Crowhurst, published byTab Books, hardbound $7.95, paper-bound $4.95.

Electronic technicians involved inaudio work must understand a great.deal more than amplifier servicing ifthey are to be successful. This bookdeals with these many other aspects.

Written in an easy -to -read style,the author covers the basic principlesrelated to impedance matching speak-ers and microphones to a given am-plifier, decibel gain, level limitations,equalizers, mixers, filters, loudnesscompensation, acoustic radiation andspeaker efficiency, constant -voltageline systems, low-level distribution,microphone frequency responses anddirectivity, remote controls, multivi-brator tone generators, noise suppres-sion, the compression and limiting ofaudio signals, re -emphasis, gain -shift-ing, power ratings (a subject aboutwhich we have received frequent read-er inquiry), commercial applications,studio applications, and many types ofspeaker systems.

We feel that this book is a must forthose electronic technicians and deal-ers entering the audio field. A betterunderstanding of this material shouldhelp improve both sales and servic-ing-even if the book doesn't includeamplifier troubleshooting.

HOW TO USE VECTORSCOPES,OSCILLOSCOPES & SWEEP -SIG-NAL GENERATORS by Stan Pren-tiss, published by Tab Books, hard-bound $7.95, paperbound $4.95.

As might be expected, the authormakes fairly frequent use of photo-graphs showing scope traces to supple-ment the text. A Telequipment D54dual -trace scope is used for produc-ing most of the conventional -typetraces, while a Mercury 3000 scope is

used for producing vector patterns.Beginning with a block diagram rep-

resenting virtually all scopes, theauthor progresses to a description ofavailable scope specifications, per-formance parameters and probes.Equations and graphs are used to ex-plain Lissajous patterns, vectorscopephase measurements and patterns pro-duced by a chroma signal generator.Dual -trace scope patterns are com-pared with vectorscope color demod-ulator patterns.

Other chapters cover various wave-forms observed with conventional hor-izontal sweep traces. (One chaptercovers sampling, storage and spectrumanalyzer scopes, which are too sophis-ticated to be of practical value formost electronic technicians in ourfield.) Sweep generators are describedas they relate to aligning FM -receiverand TV -set tuned circuits.

The last three chapters deal withtroubleshooting scopes, semiconductorcircuitry and FM stereo multiplex cir-cuitry.

This book should be of assistanceto those requiring a greater fundamen-tal knowledge concerning scopes.

199 TV TOUGH -DOG PROBLEMSSOLVED by Art Margolis, publishedby Tab Books, hardbound $7.95, pa-perbound $4.95.

According to the author, "A TV re-pair becomes a tough dog when thejob does not yield quickly to routinequick check repair measures. As mostrepair jobs appear on the bench theexperienced technician doesn't pull aschematic; instead he makes a fast ap-praisal of the symptoms and, with afew voltage and resistance checks,pinpoints the defect."

After showing the waveforms thatshould be observed on a scope at thevarious stages of a TV set, the author(for the balance of the book) dealswith specific service problems that anelectronic technician might encounterin various TV -set brands and models.

From the contents page we see thatthe book is arranged according to thetype of trouble encountered. This list-ing includes the trouble, make andchassis or model in which it is en-countered, and the corresponding pagenumber. At the back of the book across reference is arranged accordingto brand of TV set, the chassis ormodel, and finally the trouble, givingthe corresponding page number in thebook.

This book may be of help to thosethat fail to regularly read ELECTRONIC

TECHNICIAN/DEALER and do not filefeature articles, TECHNICAL DIGEST Or

COLORFAX.

CAPACITORS ...continued from page 51

suited as replacements for the gen-eral purpose types. Power capacitors are generallyrated at ac voltages and usually can-not be replaced with dc capacitors. Many capacitors in coupling andbypass circuits can be replaced withmuch higher capacity ratings. The operating temperature of acapacitor must be observed or itsvalue derated if this temperature isexceeded. AC line bypass capacitors mustbe replaced with those designed forthat application.

Major capacitor manufacturersproduce thousands of different typesof electrostatic capacitors-most ofwhich are required for military, in-dustrial and commercial application.Only a few of these are necessaryfor the consumer electronics market;and of the smaller number, only afew are necessary for replacementpurposes. The wise electronic tech-nician will find that with a few typesand values he can satisfy almost anyreplacement need. It is only occa-sionally necessary to have an"exact" replacement.

A modest and carefully selectedstock of electrostatic capacitors willmeet most requirements for the elec-tronic technician; and in my nextand concluding article, I will makesome recommendations.

Letters ...continued from page 26

a 30 -week class program (for a nom-inal fee) give them training that willmake them better electronic techni-cians.

These men have been very compli-mentary, stating that they are makingmore money, and making it easier,because of our program.

You have stated in your editorialso eloquently what I have tried to saymany times. I would like the privilegeof xeroxing this page for distributionat service meetings. Due credit ofcourse will be given.

HENRY V. GOLDEN, DIRECTORHEART OF AMERICA TELEVISIONTRAINING CENTER

MOVING?Be sure to let us know your new address.

Please enclose a complete address label

from one of your recent issues.


GHOSTS ...continued from page 43

con grease and a weatherboot tomake a durable, weatherproof con-nection. Then, the cable was tapedsecurely to the mast, lead across theroof and through a small space be-tween the house and aluminum gut-ter, as seen in Fig. 6.

Fig. 6-Shielded coaxial cable can be run di-rectly adjacent to aluminum gutter withoutfear of mismatch.

Running twin lead this close tothe metal gutter would have resultedin poor color -TV reception, but ithad no effect on the coax.

To keep the installation unob-trusive, we used staples to run thecoax under the bottom shinglesacross the house to the playroom,which housed the TV set. Then, wepried away one shingle, drilled ahole in the wall and snaked the ca-ble into the house (Fig. 7). No driploop was necessary because we ledthe cable up into the hole. When wenailed the shingle back into place tohide the hole, we were careful not

Fig. 7-Coax downlead is fed into house un-der shingle, making neat, unobtrusive instal-lation.

to crush the coax. You can run coaxthrough metal pipes, under water-almost anywhere, but if you crush it,you ruin the impedance match, set-ting up standing waves.

At the TV set, we used a 7512 -to-300f1 matching transformer. The re-sults were so good that several ofthe customer's neighbors have or-dered new antenna installations. Allghosting was eliminated and colorswere sharp and true.

Ghost killing metropolitan anten-nas cost more than ordinary coni-cals and small yagies or log periodi-cals. However, they produce excel-lent results up to about 25 milesfrom the transmitter. If ghosting isa problem in an area where signalsare strong, a metropolitan ghostkiller, carefully installed, is usuallythe least expensive way to insure ex-cellent picture quality.

QUIETZONE

SILENCE

AVASS06.11.

ANDCLEANTOO?

Then use Quietrole . . . the choice ofbetter servicemen everywhere forcleaning and lubricating all T.V. mov-ing parts.Spray Pack guarantees silent, smoothoperation, with absolutely no harmfulaftereffects for both color, and blackand white sets.Alsc available in bottlesif you prefer.

... Product of

QUIETROLE: COMPANY

- - Spartanburg, South Carolina


(CORNELLTHE ORIGINAL

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plugs & jacks * stereo switches *universal replacement antennas &bases * volt meters * cables * mi-crophones * power supplies * autostereo accessories * high precisionmotors * synchronous motors *shaded 4 -pole motors *

COMPLETE CATALOG AVAILABLE.

CALL YOUR DISTRIBUTOR NOW!

w eltron°COMPANY, INC

511 EAST PEABODY STREET. DURHAM, N.C. 27702919 682 0333

... for more details circle 106 on Reader Service Cardfor more details circle 131 on Reader Service Card


"STAR -TRACK"SPACE-AGE VHF/UHF/FMCOLOR ANTENNASFOR ALL AREAS!

the mostAdvanced Antennasever introduced!Similar design to Space Tracking Antennas!Combines the "Corner Reflector Disc DirectorArray" for total UHF coverage, with "MultipleTuned, Cut -to -Channel, VHF Elements for unsur-passed Color and Black and White TV! IncludesVHF/UHF Splitter for economical single down -lead installation. Licensed under U.S. Pat. No.3,440,658 of Richard D. Bogner, the designer ofmany Antennas used in the Space Program! 6

Antenna models for all areas-write for FREEillustrated specification brochure.

RMS ELECTRONICS, INC.50 Antin Place, Bronx, N.Y. 10462

Tel. (212) 892-6700. for more details circle 124 on Reader Service Card

REBUILD

YOUR OWN

PICTURE TUBES?

With Lakeside Industries precision equ'p-ment, you can rebuild any picture tube!EASY TO OPERATE!

Requires only 4 x 8 ft. of space.Rebuilds either black and white or color,regardless of tube size.Amazingly low operational costs.Offers excellent additional income to yourpresent business.For complete details on how you can becomepart of this increasing industry, write director mail this coupon.

LAKESIDE INDUSTRIES5234 N. Clark St.Chicago, III. 60640Phone: 312-271-3399

9 Free demonstration appointmentD Send me more information

Name

AddressCity . State

READERSSERVICEINDEX

ADVERTISER'S INDEX

American Telephone & Telegraph Co. 22

,01 B & K Division, Dynascan Corp. Cover 2102 Belden Corporation .

29

103 Book Club-Tab Books 34.37

104 Book Club-Schematics .58

105 CentralabGlobe -Union Inc. 54

106 Cornell Electronics Co. .67

107 Delta Products, Inc. 64

108 Edlyn Directory 68

109 EICO Electronic Instruments Co., Inc 57

110 Finney Company 31

111 Ford Marketing Corp. 61

112 Fordham Radio Supply Co., Inc. . 68

GTE Sylvania Electronic Components(Consumer Renewal) 27

General Electric Company . 32

1i3 Grantham School of Engineering 68

114 Heath Company 63

115 International Crystal Mfg. Co. 26

134 International Rectifier 56

116 Jerrold Electronics Corp. 65

117 Johnson Company, E. F. 62

118 Kay -Townes Antenna Company 38

119 LPS Research Labs 57

120 Lakeside Industries 68

121 Lectrotech, Inc. 30

133 Precision Tuner Service 59

122 Quietrole Company 67

RCA Entertainment Tubes 20

RCA Parts and Accessories Cover 4

RCA Picture Tubes .25

124 RMS Electronics, Inc. 68

125 Telematic Division, UXL Corp. 60

126 Terado Corporation . 68

127 Triplett Corporation Cover 3

128 Tuner Service Corporation 19

129 TV Tech Aid 62

130 Weller Electric Corporation 64

131 Weltron Co., Inc. 67

132 Workman Electronic Products, Inc. 28

Zenith Radio Corporation 23

NEW PRODUCTS

700 Audio Sweep Generator701 Field Strength Meter702 Caddy Bar Jr.703 VOM

704 Tool Case705 Intrusion Detector706 Tuner Spray707 Desoldering Tool708 Cold Galvanize709 Transistor Adapter710 Cassette Tape Splicer711 Aerosol Valve712 Metal Cassette713 Cassette Tape Recorder714 Stereo Tape Player715 Solid State Electronic Switch716 Tape Eraser717 Stereo Headphones

333333555555

55

556064646465626262

6263

TEST INSTRUMENT

900 Leader Model LSW-330 Post -InjectionSweep/Marker Generator 53

INCREASE PROFIT -SATISFY CUSTOMER

NOW PERFECT COLOR T.V. withI=1

TERADO VOLTAGE ADJUSTERS we r

CORRECTS HIGH OR LOWVOLTAGE TO NORMAL LAP. 300 to 500 watts

SATURN (shown) Model 50 172 Dealer Net Sit 77POLARIS (w/o meter) Model 50 204 Dealer Net S12 24

SEE YOUR ELECTRONIC PARTS JOBBER OR WRITE

CORPORATION1058 RAYMOND AVE 51 PAUL. MINN 55108


Technicians, Earn Your Associate

DEGREEmostly by correspondence

,,,,, edi

Study Council G I 14,11 Approsed Flee ,italogWrite Dept. T

Grantham School of Engineering/505 N We.stern, Calif 90027


JAPANESEDIRECTORY

$2.00Where to write for schematics and technical

information. Over 290 listings.

EDI:1-N DI RECTORYP.O. Box 49345, Los Angeles, Calif. 90049

. for more details circle 108 on Reader Service Card

TEST EQUIPMENTat

Discount Prices

Equipment by OtherManufacturers also Available

Write for free Catalog

FORDHAMRadio Supply Co., Inc.

265 E 149 St., Bronx, N.Y. 10451Tele: 212 585-0330

RC11 Distributors ofElectronic Supplies

. . for more details circle 112 on Reader Service Card

MOVING?Be sure to let us know your new address.Please enclose a complete address label

from one of your recent issues.

... for more details circle 120 on Reader Service Ca d

68 i ELECTRONIC TECHNICIAN/DEALER, AUGUST 1971

6

,IPLETT CORP'49-6138

1.5 2

0

lirTRIPLETTMDDEL 310-FET

ZEROO ADJ

C'1.

Mode!310-FET

MADE IN L SA.BLUFFTON 0

$78

If you needa high -sensitivity,

hand -size V -O -M...Buy Triplett's 310-FET

With a 10 megohm input resis-tance and a 300 mV DC sensitiv-ity, Triplett's handy little Model310-FET can handle practicallyany electrical measurement youmay need.Seventeen ranges (plus 6 ACcurrent ranges to 300 A with itsoptional clamp -on ammeter at -

1. Hand-s.ze FET V -O -M with 10 megohmDC input resistance.

2. Low voltage range of 300 mV DC; X1megohm range.

3. Single range switch; DC polarity -reversing switch.

accuracy, a polarity -reversingswitch and a rugged suspension -

type meter to soak up the hardknocks make the 310-FET themost convenient and most ca-pable hand -size V -O -M you can

buy.

It's a real value at $78, so seeit right now at your local Trip-

tachment), 3% DC and 4% AC lett distributor. For more infor-... for more details circle 127 on Reader Service Card

motion, or for a free demonstra-tion, see him or your Triplettsales representative. TriplettCorporation, Bluffton, Ohio45817.

linrTRIPLETTThe Wo-Ids most complete line of V -0 -M's...choose 'he one that's lust right for you

Untie your moneyWith"QT'.' The QuickTurnover InventorySystem from RCA.

How much money do you have tied upin old, unsold replacement parts? If youhave more than your share of them,then it could be plenty.

RCA can change all that with a newQuick Turnover Inventory System-"QT"for short. It represents years of studyinginventory control.

Now you can have an inventoryof the fastest moving RCA parts,selected by RCA's computers. You'll havethe parts you need when you need them.You'll know when the supply is running low.And, if any parts are dropped from the"top -mover" list, simply return themthrough your "QT" distributor.

Talk to your RCA Parts Distributorabout putting in a "QT" Inventory System.The sooner you untie your moneythe sooner you'll be counting it.

Parts andAccessories

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