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The big difference in TV Alignment instruments:Ours Works.

The B & K Model 415 Sweep/Marker Generator not only works,but it makes alignment jobs faster and more accurate.

Why? Because it eliminates the need for a separate marker generator,sweep generator, marker adder, and bias supply.You get it all in one compact instrument.

And it's so easy to use. The IF and chroma bandpasses are simulatedon the front panel for constant reference. Lights tell you whichof the crystal -controlled markers are in use and where theyshould be located. And the exclusive marker tilt feature lets youplace the markers either horizontally or vertically, so you can alwaysidentify their exact positions.

Put the B & K Model 415 Sweep/Marker Generator to work for you.

Ask your distributor for complete details.

LKProduct ofDYNASCAN CORPORATION1801 W. Belle PlaineChicago, Illinois 60613

Model 415:$399.95

. for more details circle 105 on Reader Service Card

1294

213

ELECTRONICTECHNICIAN / DEALER

COMPLETE MANUFACTURER S' CIRCUIT DIAGRAMSAND TECHNICAL INFORMATION FOR 6 NEW SETS

SCHEMATIC NO. SCHEMATIC NO.

ADMIRAL 1294 MOTOROLA 1296TV Chassis T3K3-1A, T3K3-1B Color TV Chassis TS -934

AIRLINE 1295 MOTOROLA 1298Color TV Models GC 1 -12420A,B TV Chassis TS -599

MAGNAVOX 1297 PHILCO-FORD 1299TV Chassis 1948 TV Chassis 20P22

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SYMBOL DESCRIPTION ADMIRAL PART NO

R151- 15K, 2w 60820-153R208- 1M, vol control w/sw 75(1-176R31 1 - 30K contrast control .......................... 750112-13R313 -100K. bright control 75C113-13R411 -5M height triple control 75(129.3R017- 1.2M, vert hold triple control 75C129-3R421 - 500K, vert in triple control 75(129-3RS01-5.511. fusible resistor 61(48-1R502-33001 5w 61C20-66R503-8010 Sw 61(20-101C203 -47pf 500v WO cer disc 65010-1980204-82pf 5% 500v NPO ter disc 65010-98C301 - lOpf 10% 500v NPO cer disc 65010-8701/1,308-6.4f 10% 500v NPO cer disc 65D10-102C428 -132pf 10% 4kv N1500 air disc 65010-425(503A - 250µ1 I650 elect 67(30.11C5038-15041 150v elect 67(30-11(503C -200µf 1SOv elect 67(30-111.201A.8 - sound IF 8 phase shift coil 72(301-4L202-10110 del 72C132-821303-S.6 UL RF choke 73(53-2431304 - RI choke 73(31-3L307- video peaking 73055-261401 -horiz lock coil 940I 7-191402- RF choke 73C31-111201 -audio output 'dormer 79(124-31301 - 1st IF 'former 72(308-2T303 sound toke off coil 72(185-7T401 - vert output 'dormer 79C139-21402 -del yoke oss'y ...................... 700(1089-61403-bora output 790138-4

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TOP VIEW OF CHASSIS SHOWING ALIGNMENT & SERVICEADJUSTMENT LOCATIONS

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1294 COPYRIGHT 1970 BY ELECTRONIC TECHNICIAN/DEALER HARBRACE BUILDING. DULUTH. MINNESOTA 55802

1295AIRLINEColor TV ModelsGC 1 - 1 2420A, B

ELECTRONIC 7/77=7TECHNICIAN

MAY 1970COMPLETE MANUFACTURERS' CIRCUIT DIAGRAMSAND TECHNICAL INFORMATION FOR 6 NEW SETS

T200 v2004 L201 v2008 T2014.5 MHz SOUND 1/2 12BFII OuADRATURE 1/2 128F11 AUDIO OUTPUTDRIVER TRANS ALDO CRT. COIL

Tp201 AUDIO OUTPUT TRANS.

R200 R201 8204 127, 1MEG

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0.5v. lOv

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I ALL RESISTORS ARE 1/2 WATT, 10%, UNLESS OTHERWISE NOTED

2. ALL CAPACITORS ARE IN MFD, UNLESS OTHERWISE NOTED

3. CAUTION: USE ISOLATION TRANS WHEN WORKING ON CHASSIS.

4. DC VOLTAGES MEASURED WITH "VTVM" PLACED BETWEEN POINTS

INDICATED B CHASSIS GND, WITH NORMAL SIGNAL INPUT

1*) INDICATES VOLTAGE READINGS TAKEN WITH BRIGHTNESS CONT

AT MAXIMUM ROTATION (FULLY C VI).

(.)1NDICATES VOLTAGE READINGS TAKEN WITH BRIGHTNESS CONT

AT MINIMUM ROTATION(FULLY CCW).

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INDICATES THESE VOLTAGES WILL VARY WITH VIDEO CONTENT OF

THE PICTURE BEING RECEIVED AND ARE AVERAGE READINGS

(0)INDICATES THESE VOLTAGES WILL VARY WITH BACKGROUND

CONTROL SETTINGS.

R32047

470

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1295 COPYRIGHT 1970 BY ELECTRONIC TECHNICIAN/DEALER HARBRACE BUILDING. DULUTH. MINNESOTA 5 5 8 02

A

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3 A

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R803 R807 #806100,IW 47,11/1,5% 100,IW

X-÷-CR80113

80IC

WT/BED2 WOG. !CLAMVR -I

L--

85V P -P15,750 Hz

10V P -P15,750 Hz

[13184V P -P15,750 Hz

50V P -P60Hz

21100V P -P15,750Hz

CD3V P -P

15,750Hz

27600V P -P15,750Hz

10V P -P21 15,750 Hz

6 13.5V P -P15,750 Hz

n10V P -P3.58 MHz

V

[14196V P -P15,750Hz

0 70(1, HPz-P

CD150V P -P

15,750Hz

cp18V P -P15,750Hz

0 180V P -P15750 Hz

18V P -P15,750Hz

[ 7 185V P -P15,750Hz

ri2.5V P -P15,750Hz

10250V P -P15,750Hz

0 70V P -P15,750Hz

0 160V P -P60Hz

O2 8 V P -P26 15,750Hz

c) 420V P -P15,750Hz

1 4 140V P -P15,750 Hz

O105V P -P60Hz

n78V P -P15,750Hz

c) 22V P -P15,750Hz

O20126V0HPz-P

AIRLINEColor TV Models GC1-12420A,B

SYMBOL DESCRIPTION AIRLINE PART NO.

C1094,11,C,D-80µ1/175v. 1000/4000. 30m1/400v,1041/150v elect 034-030700

Cl 104,8,C,D - 12004f/400v. 20r4f/400v, 100,-0/150v,441/300v, elect 034-030600

R101 -30044, 10%, 5w, fixed film 054-301510R102 -3.3K. 10%, 10w, WW 053-3321108105-47011. 10%, 7w WW 053-471710R109 -control, horiz hold 75K (coarse) 055-068500R110 -control hor,z hold 20K (fine) 055-068500R123 -control, vert hold 750K 055-068500R112- control, knob voltage odi 500K 055-036500R121 -control, focus 3M 055-065500R127 - control, on -off -volume 1M 055.068800R128 -control, contrast. 25011 055-068600R130 -control, bright 21r 055-068600R131 -control. color, 50044 055-068900R133 - control, tint. 100IC 055069000R327 - control ACC. 40K 055-069200R736 -control, blue background 250K 055069200R737 -control, gm background 250K 055-069200R509 -control. vert lin 3 4M 055-064200R517 -control, red height ICIOK 055-064200R734 -contiol, red gold 250K 055-064200R718 -control. blu balance 2K 055-064500R72I -control, red balance 2K 055-064500R739 -control, blu screen, 1.5M 055-064300R740-control.gm screen, 1.5M 055-064300R741 - contrOI red screen, 1.5M 055-0643000300 --trans video amp PNP 002-01280001300 -cool, delay line 111-037400L105 - cool filter choke 032-0030001106 -def yoke 027-0831001201 -cool, quod 109-0403001300 -304 -cool, 1.8µh 111 02100015018,8 -cod, NUM I, OLORIC WOVO 110-0313001.503 -cool, choke 5.6µh 111-0365001701 -cool, 3.58MH: trap 109-0381001802 -cool. RIG right horn lines 111-0317001101 - xformer. power 033-0154007102- xformer, vert output 033-0143007103- xformer. high voltage 033-0162001200 - xformer, 4 5MHz sound driver 109.037800T201 - xformer, audio output 031-0104001309 - :former, 1st pin IF 109-0372000700-xformer chroma take -off 109-040500T701 - xformer, chrome bondpass 109-037000T702- xformer. crystal filter 109-037900T703-xformer, chrorno demodulator 109.037100C8101 -air brkr 099-003500F101 -fuse, 7a 099 003600

tuner, UHF GC1-124204 006-023000tuner. UHF G(1-1242013 006-023400tuner. VHF 006-021000yoke convergence ass'y 027-032700

NOTES:

O INDICATES "AIR" SIGNAL

INDICATES COLOR BARSIGNAL

L2

L

we II850 _ _ _ __-1517

.7-- SELECTOR STRIP.

Ls, sus CsatISELlo SELECTOR SW

OSC *03 one CO 2 TWA, 13

uni $T

SO.C.:8U1 6-1

NOTES

ALL RESISTORS ARE la RAT?, RNA (SSorortworisc Norco

2 COOL,TO. ALLIES ME N Wil OK (SSOn( RwisE NO1E0

5 IoNER13 3~1 IN vuf CRAWEL POSITION

RI47.

no

_ _ _

Ri'04

VI20(5

IN ARP

C431?

ACCINPLO

VI V22475 ALAI

5 II

241 gii-1.e.Au_

MO, 1511E9

AGE NIROIrRCN OWLS

INPUT ouTRUT

RT

8'414 IflOIC! 'CA; I Ea,

TESTPOINT °::PuT UlITPUT

I

if OuTPuTITO CNASSISI

I. tfOlfr I* OvTPUTIRON 0x835151

I 0 u,TLINERI

COPYRIGHT 1970 BY ELECTRONIC TECHNICIAN/DEALER HARBRACE BUILDING. DULUTH MINNESOTA 55802

VHF Tuner Schematic Chogrom

1296MOTOROLA

ELECTRONIC 2/17=L7121TECHNICIAN / O

Color TV ChassisT5-934

ACC

2 C15


06A2Y

1ST VIDEO IF

3 31185

20V foo-, b--8-

1203

M48I5

HS AGC GATE

Fr.

DI

VI0- AGC

SET

UP

Er*

AGC COILON FLYBACK RII 47K

13 16 ±CZ

IMF

02AlA

AGC AMP

01

P25RF AGC

DELAY

T1

CAI.001

CO

07AIU

2%1)9113E0 IF

R32 100

T. P. I

INPUT

08AIU

IF AUDIO PANEL 'BA"

C39 2303

3RD VIDEO IF T3D2R36 56 ir - - --11

reR53 SW331 & . _Ic .4

7 I a 35 r--1333 1.16.

...4131 ' T18 .-!' a 1

(.32 (82 TCz23401Z

b

1.,OTI&O-, P-1

8- '4

g gl__,

,

2,cc _ i

1 TR.14, zio--1

R1003,8

.,-. cr

L2

R40 270 1-10

C38 C40

10

AANR41 3.6K

Cdl 180

4.510IL

09

A6.1

1ST VIDEO AMP

C561 Ri2 100

C57 68120

C58

100

A

112B -7

CTO

SOUND

IF DEE

E.6 I8

40MF

AGC

DELAY

15- -

7

SA

lo9

CI7

1.561F

09 011

ASU P2SACC AMP COLOR KILLER

R48 2.2MJVVV

R44 47K

22

20V

DI

22

20V

INTEN SIT

COLOR VIDEO PANEL "SA

12 RI9 2.2K 13

00 Innr0--1'!3,1/,2-

DELAYITNE,-1-0AN--1 018

Q3 P2SM4841 i SYNC &AGC

AU VIIII0 AM - TAKE -OFF

8 220V

C101) 4.7MF.1100

R105 2.7K Rut3.5K

VIDEOPEAKING

RIDIA750

a gMOT ON I 81

&.03

20,

CONT-RAST

CI

MUM!

1ST COLOR IF

C71 39

05

M4842

PULSE LIM

& INVERTER R24 I.5KR23 4.71

OC

06A5W

COLOR SYNCGATE & AMP

R964.71

- L12

C18 7

222 Q22 2 22 22

209 209 20V 20V

07M484/

VAL DRIVERC20 7d 7

YI

0I

3.58XTAL

08M4841

)(TA)AMP

27

R4U 1001AAN

C24

010 012A3N A2T

VAL OSC PHA SE SPE ITTIR

22 2=

22 22

20V 209

013M484I

PHASE

SHIFTER

209

02M4841

290 COLOR IF

014

AIL3.58 LIMITER

FA

R20 270 C9:AN

Q2

P2W

SYNC

SEP RI2 5.0K

01

A6.1

GATE PULSEFORMER

-

QS20V

4

3009PULSE

E3

ROOK CSIr680

R7 1000

E2 ......DOJOq

R4 56KR37 5bk R16 look 76

I 51

ILIOK 85 50K R3 27KDEFLECTION PANEL FA

AANcir_ ""ell:MN

V3B CIL V4

1'2 6818'

6CW5

01: Xl: VERT n SC1

R30 27K R24 82K 01VERT OUTPUT'

1 C141(173------0ANA-_,_%w_lC12 033 7 j_CIO

01 R35 18I C1.31

.039 R25 1K2

9 JW 1129 it R2I 150

25

VERT HOLD

2

3M R32 470K 1 R2, 5001

R29 100K

VERT

LINAAAA

R26 100K 24

23

10

200VVERT

IT

DI

D3G

PHASE DETR45 4.7K

ZOV

M

J

KI


B

II

C1286 ©

21 C 481-9) c..:3; u

i150MEIr. Z y

-- 7r OUADY3COIL IC53

.0E

ICIAUDIO IC

FM

DET

113

11

NOT ONTONEPANEL

C45

22

1/3

AUDI'PREAMP

o .C46 SMF

er

ANYR47 100K

010A5M

AUDIO AMP

R23

04

P2 S

AUDIODRIVER

2I.5VAUDIO

a10

05

AUG

AUDIOOUTPUT

04

D3A

+15220MF

C311

150MF

011

P2V

AUDIOOUTPUT

4

2/U

G 640

Cd8

2MF

3

20V

13 Rep 3 3KUS wc, NNY

0

COLOR

DEMODULATOR 0

R205 39K200 ANV

BRIGHT -9312 39K NESS 830013

VOL TACE

RE C

TO ALL THREE

DEMODULATORS

RED

DEMOD

0 0BLU

IMOD

0 0ERN

DE MOD

BRIC131

-8TANKW C44

6.8MF

CRN

AMP

BIAS

TT ST

PAD

CRN OU1

H

03A61

HOR I7OSC

205

V3A12 68E8

HORIZ DRIVER

3050

IMPORTANT NOTE:ALL COMPONENTSWITHIN THIS DASHED LINE MUST BE RE-PLACED WITH IDENTICAL VALUES,TOLERANCE AND WORKING VOLTAGE TO

MAINTAIN PRODUCT SAFETY AND %-

C27 .005 RADIATION PROTECTION. HIGH VOL-

TS

C TACE MUST NOT EXCEED 27KV AT ZERO

BEAM CURRENT AT 122V AC LINE INPUT

SEE SERVICE MANUAL

L....-... i R,09 lax

1731

-C5118

.0158

R502

H. V.BIAS

FACTORYPRE-SET

R500 50

MASTER

BRIGHTNESS

L501

'1511n

VI6LF6

HORIZOUTPUT

l0

C500

R88 100

C503

27

R204 2.2KMN

0200

C205

+TOME

TO POINT "W-ON PW R

SUPPLY

NOT ONPANEL

017 LIIA5T RED

R D VIDEO DRIVE

OUTPUT

R9I 680

0157,11

BLU VIDEO9

OUTPUT

016

i`.5T

GRN VIDEOL100 OUTPUT

L.502

10

820 15K

---.----.---NW'-12223.3K

'.3`.%

7ANN`

04

w `-' D3rTo

Lir 5Tm.

AVOLTAGE

722-

200V ,.. REGULATOR20V

R200 2.7KANY

R201 2.7KivYJ

IMPORTANT NOTES:

PANEL DESCRIPTION & COMPONENT IDENTIFICA-TION. EACH PANEL IS ASSIGNED A LETTER DE-SIGNATION I I,E, BAI WHICH IDENTIFIES THEPANEL. SEE CHART BELOW.

PANEL SOD ING

BA

FA

HA

KA

SA

ZA

PANEL FUNCTION

IF - AUDIO

DEFLECT ION

CONVERGENCE

AFC (AFT)COLOR - VIDEO

D.C. REGULATOR

EACH COMPONENT IS IDENTIFIED WITH A RE-FERENCE NUMBER AND PREFIX LETTER I I,E, L201

WHICH IS RELATED TO LEGEND ON THE PANELS.

ALL "ON" PANEL COMPONENTS ARE IDENTIFIEDBY ONE OR TWO DIGIT NUMBERS 11 THRU 991.

ALL "OFF' PANEL COMPONENTS ARE IDENTIFIED

BY A.3 DIGIT NUMBER, WHICH VARIES WITHCIRCUIT ASSOCIATION AS INDICATED BELOW

ASSOCIATED CIRCUIT

IF & VIDEOP IX TUBE

AUDIOAGC - SYNCHORIZ & HI VOLTAGEVERTICAL

CONVERGENCE

POWER SUPPI Y

COLOR CIRCUIT

REFERENCE

DESIGNATION

100 - 199200 - 299300 - 399400 - 499500 - 599600 - 699700 - 799

800 - 899900 -

999/

R23:13 56K

3,7,12 P6-3 5

56-3

750 380

R209 10K

IIMASTER GI

7301

b)

o,

V2

DAMPER 1-15°At, 11

41°6CH3

2-7

30500

R506 8.2M

BOOTSOURCE

0

07

RED

G2

1 41P6-556 5

BOOT

FI

-1R2I3 160A1 1 R2I4 10M'j',7

82151

Jus)I. FOCUS j Fx I0M

POT -

I

V5

CRT

r

P1-2 S1-2

I I

C5115 (.1

+12_ 4

ma 30CP3-9 3-9

- AGC

50' 0V

11 53-7

gT

(COI

P3-8 S3-8 10

TO ACC GATE

ON PANEL "BA"

HORIZ

IC502PI -4 S1-4 100

R507 4.Y2 2 Y1 P1-6 S16)L500 3 R5I3 470 mimm...-

PHA SING I

''' 1COIL 4111 5 P1-5 S1-5

PI -3 S1-3

e

7r42 ;j500VERT PINCUSHION

SATURABLE REACTOR

-10 P1-1 S1-1 SI-B ,<P1-8VERT

L701YOKE

1.600

VERT

OUTPUT

2600

VERT

D3

9

C6i .025

00014

BLU CENTH. PHA SE

RG VERT

TILT

MOTOROLAColor TV Chassis TS -934

CONVERGENCE PANEL HA1702/B

6

LIU/A781.

Rt AL

L703/A

C TOTAL

5

RG

VERT ."8

DIFF8 AMP

RC H

DIFF

TILT

CS RT SIDE

RG V2 LINES

C2

50MF

R7* 200AVM

RG VERTAMP

BLU

VERT AMP

BLU

VERT

TILT

RG

VERT

DIET

TILT

B

CI

ICIMF g

1.704/A

K

M

\COPYRIGHT 1970 RY ELECTRONIC TECH ICIAN/DEALER HARBRACE BUILDING DULUTH. MINNESOTA 55802

1297MAGNAVOXTV Chassis T948

TR148 IV P/PIVI

ELECTRONIC Trr-WEtr,TECHNICIAN /


TR154.1 0.131/ P/P IV/

-71411"7-1410

hitCRT -1 50V P/P I VI

11111 111111

TR41.13 7V P/P IHI

TR168 0.5V P/PIVI TRI&C 10V P/P IV) TR31E 7.5V P/P IV) TR43.E 7051 P/P IHI

1632-B 3.5V P/IVI TR33 B 1.4V P/P IVI 1634-B 1.4V P/P IV) 11/42124V PT la, TR41 C 20V P/P IHI

1034-C 75V P/P IV)

120442602

a::"744]TO F. -I

0 201 02

urlF

Nao

TR31C 7V P/P IHI

1-44s/04'"'

Jct. 6403 & R404 1.3V P/P (H)

C4C47,3 sa

S

07

TR17C 14V PP. ON CRT5 6051 PIP 148

r

3

C*4Pr

C42

Pr7

12

RF AMP

IX

IS

VHF TUNER SCHEMATIC DIAGRAM

PO

-I I-

TRI L L1.

0 CM tSSCC76163;

01110 avF

CI 00PF

V

CI,I 5 *PF

-72v

V24

CO9000

0 ---

LI1

CI7

CI440Pr

la W %)0

lei

C22

5730 Pr

C51 15

9.44 Pi

2

3

043334

12

I3

C215

PT

5410

MIXERTR2

OR 2:SsCc 562

rel.( C32I

-9evC25

0os

0232022 i 10.4V

21!.

CZ310Pr

OSCTR3

OR2SC6525C466

-0750 OX

1/1.22

i251120

74 000PP 053

V 33P

#3254

*PVT 4-.2V°0-

C26 z000PF

OullOuT :74-°

PF

C34

lno434

24

C3

2

C5220NT

1ST VIFTRII

250562

C.:2

41005

-.LO3

1005

0600

.511134

0.001

1.341.11

ATTC40.1

4S.

NOT220

jjNY1 1400

,1

IF AGCTRIT

250326

10311MOO

4-4

V

011106

554 5400

RF *GCTRIO

254564 C.3.5

250

C012

260 VIFTRI2

25C 563

111042700

ON

.1045700

-I :v

4

ajo

3700 VIFTRI3

25[563

uv

Pi7g 1)1.cape'

1

sql-1,

07g, 3 4

2100 1

"

V. Cia

C14202

0225303 II:0,4

I`I' .9't

02138 *2;7.4200

.4. 240

SND IFTR2 I

25C645::4TO

4

0202, _CIO.

200

42071000

C270.12. +.17:420 012

cuff rrog icy

2200

W.?

50:

az

Q. VIDEO AMP 5,TR14

'2SC 645

.115453

KW 34 COI 143 rNr.caol

1200

0.232200

RI

50

4411'42

170

9-- .; 3

(Col roo

NOLL.

3

042

0504

41.02

11:

05055000 4.14

0007470

1ST470 ro

AUDIO SonlAMPIRS'

2 SC828

8:0.003

Iwo

2AUDIOND AMP

1652nem

504 L

VIDEO OUTPUTIRIS

ZSC584+170

41

40100

Leos

0.22 0127 .77014 .25,4.214

41

5

0Po PO."

0.22SYNC PHASE

INVERTER/EMITTER FOLLOWER

1631,50, nom,a

SYNC SEPTRI6

2SA564400490/AM

14.100041134440 820

"Fi

ELECTRONIC RIPPLEFILTER &SERIES REGULATOR

TR71250226

OMNI 2.04101 500 TO

IOU

470

64114.

C/04.005

02:14 0344

on 004

IVM 2704,5

070444430

20V00

075Nv

70400

-..2v

44,6

4702

Viii

4.40

ERROR AMPTR72

258324Ly

5,205720

6.11171

OTTO LOLT

103

osv

301

4302sec

oux 0000440 ani 409.0

57 "Z.!

42001

61504

100 2700 4700

T

N v

11

444II

soy VERTOSCILLATOR MO

5310 TR32'544 25CO21 T030

VERTCOVERT033

25A564

ti20

Lii50

Tv

Cr P32.

9000

ro .14.7.4:

4 ;.

F1"" VERT

OUTPUT1634

250226A

05.0

aw

020

04250047500

145141.14

0442.40

251.00woo+

1470/4

40,4402

0140°1MOO

500

256 t

_L.

:TOO, 100

.2402 12.0401

.2101 ._.S200

.204500 041 1.02 C:r SO:'.. - 151 4.4.6

'

042) "Itr*'11. 7:: ' - - -"'

.04 .10140RIZ 05C

TR41oos 29082055. -04

0ROO :515a nn

* L4131

vii

0:148IMO (

HORIZ DRIVERTR42

CSI2SSH

4410

HORIZ OUTPUTTRIO

2SC9OI

.8 C25.00540

040

C2I001

NOW

.2,44

4

02

ao

NOTTS L.133 OTTE.. SPLC4120*. 41.557.0143 On IA 4,4,

!NOM OI 04 NOW An vICOS MUDS5 v,,.a. OLut0132 LE53 vo14 442 4 040411.1

.4,va, 'MU ,41.022 0, 21.22/400,22 .42 042044.2v.v,412 342.480 yr, Tv51,4041 POW no ,0

S. .20 NW 004420 .44C2 C.400 1224.12.01.132 4.0 00 5.4

...VOIT.0.41 606.1 020406 52 t To 614.6.100100.14251. 0.040/11 TT 031 MOO.

...041144 0121,42

I 0

0 0

FPN

NW

OUTPUT o,AUDIO

-7 40 TR53ssf CSI256HG

J. 0800.71AUDIO OUTPUT

1654FCS125541F

PICTURETUBE

230084

14. 2200RV 150.0

0 ONPOO.5.4,

24 112

111470 a1 viNII

HARBRACE BUILDING. DULUTH. MINNESOTA 558021297 COIYRIGI-IT 1970 BY ELECTRONIC TECHNICIAN/DEALER

1298SYMBOL DESCRIPTION MOTOROLA PART NO

E300 - integrated circuit 11H rec siliconL104- choke. RF 24065947694R113 - video bias 10K 18066401619R128 - optimizer 1K/vert size: 30K/vert lin: 108....18067678A09R306 - voristor 6C66263416R6I6 - voristor 6C662634161300 -4 5MHz trop 6 ATO 24D68822407T301 - ratio detector 24D68517A161302 -audio output 25067552625

1600 - vert outputC803 -400$11/100v, 6000.41/100v/ 120µf/100v$

8081/1005 lytic 23C69772A021500 - honz osc incls core 24068130A031501 -choke. Wiz speed up 24069044404L503 -choke Nora suppressor 24069707A18L504 -horiz size 240691636041505 -choke, honz suppressor 24065947A741.800 -choke, incls C806 6 807 24V68638415R403- RF AGC. IRK 18066401A20T500- bora driver 25067440403

30713001 TAO' MEASUREMENTS

I. TAKEN FROM WONT 15011 11LL, To CHASSIS WITH A ,T151

2. LINE oLTAGE MAINTAINED 41 1201 E.

3. TAKEN WITH ONTRAST 1031001. 51 101.1111104 1ND

ALL OTHER CONTROI 5 IN SORCAI OPERATING POSITION.4 WHERE TWO 501.TAGLs SRI 1101.01

VOLTAGE 41.05E BOX 111111 NO SIGNAL 1 SPOT , TUNER OS VHANNEI.111714 LFAST NOISE AND ANTENNA TERMINALS SHORTEDVOI.TAGE IC BOX -WITH TUNER 05 STRONG STAT1014 ARP UUTSIDE MVP.*

1141 [FURY NEASIRE31E1ITS1 TAKEN FROM POINT 110111 1T111 TI1 I NiSsIS AITN

11/1. BAND OW 11.1 OW OP/2 001 II LOSL OPE 0054 ID EAR SWII.P RAT/ I %OR 47111.J. TAKEN 101711 STRONG 61141 I usTILAsT 105TR01 17

MA51111.11 411. OTHER 1 J0TRUIS IS NuRmAiOPERATING POSITION_

DIC RTES VOLTAGE VARIES 1117H ONTROI SETTINGS'Anise OTHERWISE SPE( 1,1E11 I API( I TOR 0(1111S IPSO THAN ONE

IN HT. ALL OTHERS. IN PF C APA% 11'VA) 1AI LES 01111 ARESHORN ON SCHEMATIC VIAGRA% REFER TO PORTS I 1ST.

RESISTORS ARE 10' 12..COIL RESISTOR. ES I.EsS THAN 0110 501 SHOWS

slC100100

IF INPUT FROM TUNER

TO VHF

TUNER8 +

ANDUHF 13-4. 516

TO TUNER IRF AGC

11!.

ON

TUNER

1 20 V

5087

C

O

CBEOIO 1651.

023

BEC FUI ,Its,

00, 02 & Q8

05 1631.

E B C

101110,

AllOTHERS

1300101 ,111.

14

3 E

5

4.4

Q101AIS1

25D69990A01 T501 - HV Xfortner complete ......................24069826802L700 -yoke, deflection 114 ................. 24D68523A05L801 -choke, filter ................... 25067554415R124 -contrast rotary, 1K C2I, D2115-599 ....... 18067502414R201 -bright, slide 100K C1915-599 ....... 18D68443A14

bright rotary; 100K C21. D21TS-599 18067637463R602- vert slate, 3K C1915-599 ........ 18068443413

vert rotary, 3K C21, D21TS-599 ....... 180676374641800 -power 25068499004

VHF tuner, CPTT, OPTT-413UHF tuner. KTT.626

Kw 11

0 019 024,

8& Q5 IAIN$

B t., C

E300TOP I IA

7


COMPLETE MANUFACTURERS' CIRCUIT DIAGRAMSAND TECHNICAL INFORMATION FOR 6 NEW SETS

SIGNAL PROCESSING PANEL °G13'

MOTOROLATV Chassis TS -599

MAY 1970

C,1$31

05

j 61 470 201

I IF AMP > C

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ELECTRONIC TECHNICIAN/DEALER is pub-lished monthly by Harbrace Publications,Inc., Harbrace Building, Duluth, Minnesota55802, a subsidiary of Harcourt, BraceWorld, Inc. Subscription rates: One year $5,two years $8. three years $10, in the UnitedStates and Canada. Other countries: Oneyear $9, two years $14, three years $18.Single copies 60. Second class postage paidat Dansville, New York and at additionalmailing offices. Copyright 1970 by HarbracePublications, Inc.POSTMASTER: Send Form 3579 to ELEC-TRONIC TECHNICIAN/DEALER, HarbraceBuilding, Duluth, Minnesota 55802.

07

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J


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.

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 CORPORATION,iCTOr-cr -SUPERVISED TUNER SERVICE

MIDWESTEAST

SOUTH-EASTWEST

817 N. PENNSYLVANIA ST., Indianapolis, Indiana TEL: 317-632-3493(Home Office)

547-49 TONNELE AVE., Jersey City. New Jersey TEL: 201-792-3730

.938 GORDON ST.. S. W.. Atlanta. Georgia TEL: 404-758-2232

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

. for more details circle 142 on Reader Service CardMAY 1970

. TEL: 213-769-2720

eni me does pay.If you're an alert distributor.

Because we are introducing a new product with asuggested retail list of $89.95 that will sound a warn-ing when it detects an intruder, vandal or trespasser.

It's the Mallory Crime Alert' ultrasonic intruder alarm.

This new Mallory product is easy to stock-no timeconsuming installation-no big warehouse spaceneeded. It's bound to be a sure-fire seller because

it's so beautifully simple and effective. It gives 24 -hour surveillance for homes, offices, stores and plantsat small cost and needs no maintenance.

MALLORY

In use, there are no wires, no light beams, no doorand window devices ... just the compact Crime Alertunit itself. Set up in a room or hall, it sends out con-tinuous ultrasonic waves that can't be seen, heard,

or avoided. Yet the smallest movement is detected ina split second, activating the built-in alarm and anyspotlights, sirens, recorders or other devices plugged

into it.

The same type of system is used in the Pentagon to

guard the security of top secret areas. It's an itemeverybody needs today. So put in an order now.

MALLORY DISTRIBUTOR PRODUCTS COMPANYa (-11Ielon of P. R. MALLORY & CO. INC.I3ox 1558. Indlenapolle. Indiana 40200: 'Telephone: 317.030.5353

Batteries Capacitors Cassette Tapes Controls Crime Alert( Resistors Semiconductors Sonalert® Switches Timers Vibrators

ACTUAL SIZE

. . . for more details circle 129 on Reader Service Card

20ELECTRONIC TECHNICIAN/DEALER

HUGH "SCOTTY" WALLACEPublisherChicago:

(312) 467-0670

PAUL DORWEILEREditor

PHILLIP DAHLENManaging Editor

JOSEPH ZAUHARTechnical Editor

KATHIE PONTINENProduction EditorBOB ANDRESEN

Graphic DesignLILLIE PEARSON

Circulation FulfillmentJOHN KESSLER

Manager, Reader ServicesBERNICE GEISERT

Advertising Production

OFFICES

757 Third AvenueNew York, N.Y. 10017Phone: (212) 572-5000

Telex: 01-26286

43 East Ohio St.Chicago, III. 60611

Phone: (312) 467-0670Telex: 02-53549

1901 West 8th St.Los Angeles, Calif. 90057

Phone: (213) 483-8530

Harbrace BuildingDuluth, Minn. 55802

Phone: (218) 727-8511Telex: 02-94417

MANAGERS

HUGH "SCOTTY" WALLACEChicago: (312) 467-0670

DEAN GREENERChicago: (312) 467-0670ALFRED A. MENEGUS

New York: (212) 572-4829

DONALD D. HOUSTONLos Angeles: (213) 483-8530

ROBERT UPTONTokyo, Japan

I.P.O., Box 5056CHARLES S. HARRISON,

CY JOBSONSan Francisco:

(415) 392-6794

HARBRACE PUBLICATIONS, INC.

JOHN B. GELLATLYPresident

RICHARD MOELLERTreasurer

LARS FLADMARKSenior Vice -President

HARRY RAMALEYVice -President

JAMES GHERNAArt Director

EDWARD CROWELLDirector of Marketing Services

ELECTRONICTECHNICIAN / DEALERWORLD'S LARGEST TV -RADIO SERVICE & SALES CIRCULATION

MAY 1970 VOL. 91 NO. 5

45 INTRODUCING MOTOROLA'S QUASAR II COLOR TVThat is the theme of this month's TEKLAB report which will present a description of thecircuits in this unit in two parts; part two follows next month. The circuits covered thismonth will include the power supply, ACC amplifier, color killer and others.

49 HIGH POWER TUNER/AMPLIFIERSThis article by Homer L. Davidson provides some practical service procedures with simpletechniques a technician can use as he learns more about solid -stale amplifiers.

53 THE LONG AND SHORT OF MATV CABLESRobert Sharp and Paul Miller, two men who know the whys and wheres of cable, col-laborated on this informative article which explains how a multiple antenna system canpick up a normal TV signal only to have it reach a customer's set distorted because of apoorly designed or installed cable system.

59 ELECTRONIC DEPTH FINDERSThis timely feature on marine electronic equipmert and more specifically, on electronicdepth finders, explains the operation and maintenance 01 these increasingly popular in-struments. The article also includes a complete circuit description of the Heath ModelMI -29 with diagrams and schematics.

63 TESTLAB REPORTOur lab technicians give a first-hand account of the EICO Model 240 solid-state FET-VOMwhich was assembled from a kit and checked out on the bench. The report also lists themanufacturer's complete specifications.

22 EDITOR'S

26 NEW AND NOTEWORTHY 80 NEWS OF THE INDUSTRY

30 LETTERS TO THE EDITOR 84 NEW PRODUCTS

36 TECHNICAL DIGEST 90 CATALOGS AND BULLETINS

40 COLORFAX 92 ADVERTISER'S INDEX

COVEROur cover this month was taken on one of Northern Minnesota's beautiful lakes and at-tempts to illustrate the increasing popularity and use of marine electronic equipment aspart of the boating enthusiast's basic requirements for safer boating.

TEKFAX 16 PAGES OF THE LATEST SCHEMATICS Group 213ADMIRAL: TV Chassis T3K3-1A,T3K3-1BAIRLINE: Color TV Models GC1-12420A,BMAGNAVOX: TV Chassis T948MOTOROLA: Color TV Chassis TS -934MOTOROLA: TV Chassis TS -599PHILCO-FORD: TV Chassis 20P22

kiFA HARCOURT, BRACE & WORLD PUBLICATION yr;Harbrace Publications, Inc. isp

ELECTRONIC TECHNICIAN/DEALER is published monthly by ElectronicsTechnician, Inc., a subsidiary of Harbrace Publications, Inc. Corporate Offices:757 Third Avenue, New York, New York 10017. Advertising Offices: 43 East OhioStreet, Chicago, Illinois 60611 and 757 Third Avenue, New York, New York10017. Editorial, Accounting and Circulation Offices: Harbrace Building, Duluth,Minnesota 55802. Subscription rates: One year $5, two years $8, threeyears $10,in the United States and Canada. Other countries: one year $9, two years $14,three years $18. Single copies: 75C in the U.S. and Canada; all other countries$2. Second class postage paid at Dansville, New York 14437 and at additionalmailing offices. Copyright 1970 by Electronics Technician, Inc.POSTMASTER: Send form 3579 to ELECTRONIC TECHNICIAN/ DEALER,Harbrace Building, Duluth, Minnesota 55802.

MAY 1970 21

FM-2400CH (New) Tests Predetermined Fre-

quencies 25 to 1000 MHz New Extended Range

Covers 950 MHz Band. Pin Diode Attenuator

FM -2400C Tests Predetermined Fre-

quencies 25 to 500 MHzThe new FM-2400CH and theFM -2400C provide an accuratefrequency standard for testingand adjustment of mobiletransmitters and receivers atpredetermined frequencies.The FM-2400CH with its ex-tended range covers 25 to 1000MHz. The Model FM -2400Ccovers 25 to 500 MHz. The fre-quencies can be those of theradio frequency channels ofoperation and/or of the inter-mediate frequencies of thereceiver between 5 MHz and40 MHz.Frequency Stability: ± .0005%

from +50 to +104 F

Write for catalog

FM -2400

FREQUENCY

METERS

Frequency Stability: with built-in thermometer and temper-ature corrected charts.

.00025% from +25 to+125(.000125% special 450 MHzcrystals available)

Both the FM-2400CH and theFM -2400C are self contained insmall portable cases. Com-plete solid state circuitry. Re-chargeable batteries.

FM-2400CH (meter oniy)..$595.00RF crystals (with temperature

correction) 24.00 ea.RF crystals (less temperature

correction) 18.00 ea.IF crystals catalog price

FM -2400C (meter only) $445.00RF crystals (with temperature

correction) 24.00 ea.RF crystals (less temperature

correction) 18.00 ea.IF crystals catalog price

INTEFINATIONAL

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



EDITOR'S MEMO

Educational TV

I just returned from the IEEE con-vention in New York and have to ad-mit that with the airline controllers'sick -in it was something of a long trip.I never spent so much time on oneairplane going nowhere in my life.

But if something good were to comeof it all, I would say that the IEEEand several of the press conferenceswere worth it. One of the mostinteresting meetings I attended wassponsored by CBS for their color EVR(Electronic Video Recording) divi-sion. The meeting had as guest speak-ers Mr. Frank Stanton, CBS president,Mr. E. H. Wavering, President of Mo-torola, and Mr. Daryl F. Zanuck,Chairman of the Board of 20th Cen-tury -Fox Films. The meeting tookplace in the Grand Ballroom of theHotel Pierre in N.Y. City in whichwere set up several Motorola produc-tion line monitors, color of course,and several video tape players.

CBS president Frank Stanton andMotorola president Elmer H. Waver-ing were joined by Daryl F. Zanuckin announcing plans to make 20thCentury -Fox theatrical films availablefor conversion to the new EVR sys-tem of showing on home receivers.The color EVR system was developedby CBS, and Motorola obtained theexclusive license to manufacture theplayers in North America. The play-ers are capable of either black andwhite or color with only a simplehookup to the regular antenna outleton rear of the TV set.

Since the premier showing of theEVR system, plans now call for ademonstration tour which will in-clude exhibits at 17 major cities acrossthe nation. Just think, soon you maybe selling CCTV and video tape re-corders to your color TV customers sothey can show their own home colormovies from a popular selection ofthe best of 20th Century films.

NEW AND NOTEWORTHYFor additonal information on products described in this section, circle thenumbers on Reader Service Card. Requests will be handled promptly.

SOLID STATE

ONE GUNBOOSTER

EXTENDS

COLOR

GUN

LIFE

FOR COLOR TV

RESTORES

RED, BLUE

,,.# OR GREEN

BRIWA BICE

cacv tC) INSTA

COLOR CRT ONE GUN BOOSTER

Boosts only weak gun 700for proper color balance

Introduced is a solid-state one gunbooster for color TV picture tubes.The booster extends color gun life byrestoring the brilliance of either thered, blue or green gun.This unit is not the same as a regularbrightener that boosts all three colorsequally, but will boost the one weakcolor as needed for a balancedcolor picture.Installation is easy with self -strippingconnectors that are included in thepackage. Workman.

FOR MORENEW PRODUCTS SEEPAGES 72 & 84

SOLDERING IRON, POWER UNIT

Tips changed 701without fools

Announced is the Model W-TCPTemperature Controlled, Low VoltagePencil Iron and Power Unit. The unitrepresents the most advancedequipment available for productionline manual soldering andtechnical use.The pencil, weighing 11/2oz (21/2ozincluding cord) reportedly packs theheating capacity of irons weighinga pound or more. It automaticallyadjusts to handle jobs in the 15 to 75wconventional iron range and anextended range up to 100w, whereproduction rate is not excessive.The unit uses interchangeable,premium plated tips, each with itsown magnetic temperature sensor forselected tip idle temperature. A widevariety of screwdriver, conical andpyramid tips are available.The power unit furnishes the solderingpencil with a source of 24v currentand is equipped with a handy standfor the pencil. A heavy dutytransformer, rated at 60w, 120v,50/60Hz is housed within thephenolic case, which is also providedwith a sponge for tip cleaning. Weller.

PATCH -BOARD 702

More economical thanconventional breadboarding

Introduced is the EU-53A "Stack -n -Patch" ... a technique for circuitdesign and teaching that is faster,easier and more economical thanconventional breadboarding.The board consists of a small desk -topchassis, a Power Patch Card and aComponent Patch Card. Patching upa design is fast and simple ... pickyour choice of power supply andconnect it to the Power Patch Card. .. stack the Component and PowerPatch Cards in the Chassis . . . andpatch components or hook-up wireinto the Component Card. The Patch -Board eliminates soldering . .. thespecial connectors on the cards makea tight, electrically stable connectionjust by inserting the wire into theconnector. The 177 connectors onthe board are arranged according tocommon circuit board practice andclosely simulate the circuit densityand "stray" interaction of today'sprinted circuits.For IC work and other types of designthat can't be conveniently built onthe component card, a wide variety offactory assembled cards to stackin the chassis is offered. The ModelEU-53A is $37.50. Heath.

ELECTRONIC TECHNICIAN/ DEALER

Now theChromacolor revolution

comes toreplacement tubes too!

Now you can install Zenith's patented Chromacolorpicture tube that outcolors, outbrightens, outcontrasts and outdetails

every other 23" diag. color picture tube.

With a full 2 -year warranty!After years of pioneering researchand development, Zenith has per-fected a color TV picture tube differ-ent than any other on the market. Sorevolutionary that it outcolors, out -brightens, outcontrasts and outde-tails every other 23" diag. color tube.And it's a Zenith exclusive-coveredby U.S. Patent No. 3,146,368.

Before Chromacolor, every giant -screen color picture was made up oftiny dots on a gray background.

But Zenith made the dots smaller,surrounded them with jet black and,for the first time, fully illuminatedevery dot. Result: the brightest,sharpest picture tube in giant -screencolor TV.

The Zenith Chromacolor tube willreadily replace the 23" diag. tube inalmost any TV whatever brand. And,unlike most replacement tubes, it'swarranted for two full years.

A A A A AY

A A A A.V V V

Magnified drawing of Magnified drawing '

ordinary color TV screen Zenith Chromacolorbefore Chromacolor TV screen

Enn

Order the Zenith Chromacolor pic-ture tube from your Zenith distributorfor your next installation. And putyour customer in a better light.

At Zenith, the quality goes in beforethe name goes on.*

TWO-YEAR WARRANTYZenith Radio Corporation warrantsthe replacement CHROMACOLORp cture tube to be free from defectsin material arising from normal us-age for two years from date of orig-inal consumer purchase. Warrantycovers replacement or repair of pic-ture tube, through any authorizedZenith dealer; transportation, laborand service charges are the obliga-tion of the owner.

Simulated TV picture

L 0ONLY ZENITH HAS IT

MAY 1970

600 BUCKS WORTH OF TV...SET AND ANTENNA AND

STILL A LOUSY PICTURE !

. ' . ' .....

HERE'S A GUYWHO NEEDS BELDENANTENNA LEAD-IN

CABLE

4\))Th,_rA-ri-idik

Color or UHF set perfect? Antenna perfect? Then obviouslythere's a missing link. Check that antenna lead-in cable.Old, worn-out, weather-beaten cable, or the ordinary flatribbon kind designed for black and white VHF, causes morefuzzy, distorted pictures than you can count. It's youropportunity to upgrade these customers to a cable matchedto their particular signal reception situations. One ofBelden's Big Four-the link to perfect reception.

FOR CONGESTED AREAS ...

8290 SH11.1,111.11PERMIIIIM

LOID PIRMONM FOR 2 CHANNEL

In congested, in -city areas, stray electrical interference and noise areat their worst. For perfect, all -82 channel reception-color or B/W-replace old cable with Belden's 8290 Shielded Permohm. Its aluminumBeldfoil° shielding prevents pickup of ghost signals and electrical noiseby the lead-in. Weather-proof and water -proof. You can tape it right tothe mast. Or install it underground, in conduits-even in rain gutters.

AWG &(Stranding)

Nom.O. D.

Color (inch)

Nom.Velocity of

Propagation

NOT.Capacitanceir

(mmf/ft.)N Nom. Attenuati

per 100'ITC db,

221/ x 101 Hrowtt .305 h9.8 1.72.1

.bib 1// 3.2

Copperweld, 2 conductors, orange polyethylene insulation and web 213 3.5

between conductors, cellular polyethylene oval insulation, Beldfoil 473 5.4

shield, stranded tinned drain wire, polyethylene jacket. 671 6.6887 7.7

StandardPackage

Lengths in ft.50', 75', 100' coilshave terminalsattached.Available in counterdispenser.250'. 500' spool.

26 ELECTRONIC TECHNICIAN/DEALER

/FOR FRINGE AREAS...

BELDEN 8285 - PERMONA4

1128.1 PI.IEMIIHMAntenna cable in uncongested or fringe areas picks up littleelectrical interference. But does get a lot of weathering, whichdegrades an already weak signal. These customers needencapsulated cable. Belden 8285 Permohm. Its special poly- 4 '-".. ' .

/-----.I

- II

iethylene jacket protects the energy field, regardless of weather - - ..4, ..conditions. It delivers the strongest signal of any unshielded aa

twin lead under adverse conditions. Requires no matching....-.7-N---%'jtransformers and connectors. For all 82 channels, color or B/W.

0. D.-.

(inch) Wen .22 (7 x 301

Copperweld.web between

Brown .255 73.3c%:, 5.3I

1 '46R2 conductors parallel, orange polyethylene insulation andconductors, cellular polyethylene oval jacket.

. ,

100 1.4300 2.8500 3.8700 4.8900 5.6

50', 75', 100' coilshave terminalsattached.Available in counterdispenser.250'.500' coils and1000' spool.

110

...)

/"--FOR LOCAL BLACK AND WHITE...

\- .11075 1A 1 7A 1 A A1 111,IN17A

i.,.

'. ,.

if1-

-- ....

rte- t- :I. - Cracked, corroded, weathered cable, full

loses signal strength; prevents any TV

...:Lquality picture. Upgrade B/W VHF and

. -- --\ .---` - .'

NNto Belden 8275 Celluline. Performanceall possible moisture between conductors

. ... nated. Abrasion -resistant and weatherlong service life. And, it requires no end

of dirt and moisture,set from delivering alocal UHF customersis improved because

has been elimi-resistant for a long,

sealing.

AWG 8(Stranding)

Nom. MOM. MOM. ! Noah. Attaintlenant0. D. Velocity of Capacitance per 100'Color (inch) Propagation (mmf/ft.) mc db

T StandardPackage

I Lengths in ft.20 (7 x 28)

Bare copperweld;gas filled unicellular

\,...

Brown

2 conductorspolyethylene

.300 HO,', 4 6 100 1.05x 200 1.64.400 300 2.12

400 2.5parallel, polyethylene jacket with inert 500 2.98core. 700 3.62900

.4.3

50', 75', 100' coilsin counter dispenser.250', 500', 1000'spools.

POI

FOR MATV AND CATV... ..--Il

N DUOFOIL 11221i I/111114911; COAX

,..., .

Got an apartment or townhouse complex in your area? Motels 0 irior hotels? Or is CATV coming? Use Belden's new 75 ohm -7.

coaxial cable -8228 Duofoil. Shielding is 100%-sweep tested IR100%. Spiral wrapped drain wires provide long flex life. Small

. IIdiameter saves space in conduit installations. Use Duofoil-.;00for all coaxial color and B/W VHF, UHF and CATV applications.

_

Rr -Iu

al%

qr11,

gil inI IIJ

34.54-,

Nom.Velocity of

_

Nom. Nom. Attenuation StandardCapacitance per 100' PackageImmf/ft.) ...:-. mc db Lengths in ft.

' _18

Solid, BareBlack .242 78% ! i. -; 50 1.5

100 2.1200 3.1300 3.8400 4.5500 5.0600 5.5700 6.0800 6.5900 6.0

100", 500". 1000'spools.

1

illow.

See your local Belden distributor for fulldetails or to order. For a free copy of the BELDENrecent reprint article, "Electronic Cable,"write: Belden Corporation, P.O. Box 5070-A,Chicago, Illinois 60680.

'441S"... for more details circle 106 on Reader Service Card

MAY 1970

So is this.

It used to be if you wanted to satisfy everyone, youhad to stock over 30,000 different solid state replace-ment parts.

Well, everyone realized that was ridiculous. Sosome enterprising people came up with a bunch ofuniversal replacements.

Then you only had to stock about eleven or twelvehundred.

That was a lot better, but we still thought it was alittle ridiculous.

So two years ago (when we went into this busi-ness), we figured out how to replace all 30,000 withonly 60.

Now all you have to do is stock 60 of our diodes,transistors, integrated circuits, etc., and you can re-place any of the 30,000 parts now in use. Including

all JEDEC types, manufacturers' part numbers, andforeign designs.

That means you invest less money.You don't tie up valuable space.You do away with complicated inventory control.And you operate more efficiently.To make life even easier, we've got a new book

that gives you all the cross references you need tofigure out which part replaces which.

It's available from your Sylvania distributor.If the whole thing sounds rather incredible, you're

right. But why not give your distributor a call and lethim narrow the incredibility gap.

SYLVAN IAGENERAL TELEPHONE & ELECTRONICS

29

RATCHET TYPE GOLD CHIMNEY MOUNT=8011 Galvanized Strapping 2 x 12' $4.33=8013 Stainless Steel 2 x 12' $5.18

There's Profit In Gold1. GOLD RATCHET MOUNT - New gold finish - first available onthe market. New heavy gauge - non -strip ratchet features. Here isthe quality constructed two -bracket chimney mount designed to givemaximum service in high wind, seasonal storms, adverse weatherconditions. 2. GOLD TRIPOD TOWERS - Boxed - contains 6 lagscrews supplied with self-adhesive weather patch, 11/4" tubing.3. GOLD CHIMNEY MOUNTS - Both Snap -in chimney mounts andGC -Telco "Y" Mounts are heavier gauge metal with new design.GC chimney mounts are strengthened at the stress point. Buy withconfidence from the world's largest basic manufacturer of tele-vision hardware ... you'll make your job easier, faster, and moreprofitable ... more satisfying to your customer.

GOLD TRI-PODTOWER ANTENNABASES

HEAVY DUTYGOLD SNAP -INCHIMNEY MOUNTS

=9146 3' $5.86 =8646 Galvanized=9145 5' $9.28 Strapping $3.09

2 x 12'=8946 StainlessSteel $4.462 x 12'

G=1ELECTRONICS

GC-TELCO GOLDCHIMNEY "Y"MOUNTS

#8616 GalvanizedStrapping $3.852 x 12'#9031 StainlessSteel $5.032 x 12'

GC ELECTRONICS IMAIN PLANT: ROCKFORD, ILL. U.S.A.A DIVISION OF HYOROMETALS, INC.

LETTERS

TO THE EDITOR

Reader's AidWe need a schematic and instruc-

tion manual for a Sonora electronicorgan, Model 200 400. This company,Sonora Electronic, Inc., has been outof business for many years. Any helpwill be much appreciated.

NORMAN L. FITKINNorman L. Fitkin Television Sales

and Service207 CircleSebring, Fla.

We have a Citizens Band transceiv-er made by Polytronics, which waslocated at 900 Burlington Ave., SilverSprings, Md. 20910.

I wrote to them and the mail hasbeen returned, so I presume they areno longer in business. We cannot lo-cate a dealer or distributor that couldfurnish me with the schematics andinstructions for the above mentionedtransceiver. It is a Poly -Comm 30 Se-rial No. 126A21, issue No. I. If thereis any way you can help me, I wouldgladly pay all costs involved.

Your magazine has been very bene-ficial and we definitely look forwardto its arrival each month.

Lou WEISSBetter Radio & Television Service957 Morris Park Ave.Bronx, N.Y.

I am a subscriber of your magazinein need of some information that Iam unable to find anywhere. Couldyou please tell me where I can obtainparts for Webcor models?

I know that they went out of busi-ness, and I am having difficulty tryingto find parts for them.

JAMES R. CAHILLJim CahillRadio, Television & Electronic

ServicingWilmot Flat, N.H. 03287

As a subscriber of ELECTRONICTECHNICIAN/DEALER, for I believe20 years, I have yet to see very muchcovering the subject of marine radioequipment in the 2 to 4 MHz band,or much if anything on mobile radioequipment in the 150 to 174 MHzband. I presume it is mostly becausethere is a much greater demand forthe entertainment type of electronicgear. However, there must be manyother technicians interested in corn-



Do you judge capacitorson the same basis

Bill Dickerson does?

Then you'll use

Sprague Twist-LoV Capacitors whenyou need twist-prong electrolytics.

To be successful, c TV service dealer has tobe fussy about a Ipt of things. No one knows it better thanBill Dickerson of Central Radio and Television,Santa Barbara, California. He's building on his17 years' servicing experience every day in a spotwhere being fussy counts a lot.Central Radio is 14 people strong andhas 4 service truck on the go. It's ec sy to seewhy Bill prefers Sprague Twist-Lok Capacitors.They can be used as exact replacements to avoid call-backs.It pays to be fuss).

Ask your Sprague distributor for a copy of Sprague'sElectrolytic Capacitor Replacement Manual K-109 or write to:Sprague Products Company, 65 Marshall St., North Adams, Mass. 01247

P.S. You can increase your business 71/2% by participatingin EIA's "What else needs fixing?" program. Ask yourdistributor or write to us for details.

SPRAGUE®THE MARK OF RELIABILITY

6,9116


31

COMPLETE SERVICE

ON ALL MAKESOF TV TUNERS

me n

(WE SHIP C.O.D.)YOU PAY SHIPPING

$9.95lackWhite

or Color

VHF or

UV Combo's $16.50Price includes all labor and partscept Tubes, Diodes & Transistors.combo tuner needs only one unitpaired, disassemble and ship o

defective unit. Otherwise therebe a charge for a combo tuner.When sending tuners for repair,move mounting brackets, knobs, incator dials, remote fine tuningrangements and remote control driunits.

All tuners must have remote con+units and/or mounting bracketsmoved before tuner can be cleanand repaired. Please remove theaccessories before shipping, aswill not be responsible for lossdamage.

All tuners y FACTOITRAINED TE ANS with yeof experience in this specialized fieAll tuner; are ALIGNED TO MANFACTURER'S SPECIFICATION on crytal controlled equipment andchecked on monitor before shippito assure that nes is at'properly.

GEM CITY TUNERREPAIR SERVICE

Box 6D Dabel Station

2631 Mardon Drive

Dayton, Ohio 45420

LETTERS

TO THE EDITOR

munications equipment topics also.My real reason for writing you is

that I am looking for a recommendedlist of test equipment most needed toadequately equip my shop for the in-stallation and servicing of communi-cations equipment, such as the abovementioned. Would you be so kind asto tell me what you and your staffmight recommend, and furnish mewith a listing of manufacturers thatI might contact for their catalogs andprice information. Of course, if youcan help me in any other way I wouldcertainly appreciate it.

Radio and TV servicing has beenmy trade for the last 20 years, but Ifeel that I must slow down a little soI am giving up all the TV and radiobusiness, only keeping my marineradio work. In so doing I am invitedto service all the local mobile radioequipment on the Island of Nantucketand to do so will naturally require meto invest in, I presume, considerablymore test gear than what I have hadheretofore.

FREDERICK W. COOKCook's ElectronicsBox 831Nantucket, Mass. 02554

We have a dc voltmeter, Model20A, manufactured by F. L. MosleyCo. of Pasadena, Calif. This volt-meter was made for the Navy.

We would like to know if any ofyour readers has any information, dia-grams or an address for the MosleyCO.

CHARLES F. MEYERElectronics InstructorTwin Falls Senior High SchoolTwin Falls, Idaho 83301

Please send me the address of Rus-sell Industries. They manufactureshielding. If you do not have this ad-dress, then can you tell me where Ican get it?

PAUL CAPITOLCapitol Radio Service637 West 21 St.Erie, Pa. 16502

I am in need of information on aGrundig record player and hope youor a reader can help me. A letter toGrundig in New York resulted in theinformation that they did not importthat model. It is a Grundig ModelMandello-b No. 5263 HE.

What I need is a cross reference toone of the tubes, an EAF-801 and across reference on the cartridge orneedle. The cartridge number is AG3306 AHDT or AG 3310 AHDT.

Any help would be appreciated.DONALD C. TREECE

Don's Electronic ServiceRoute No. 3Kahoka, Mo. 63445

Selling BusinessI have an excellent going business

here in South Georgia. The people arefriendly and the climate is very good,but the time has come for me to stepdown, due to age.

It would be an excellent opportunityfor one or two younger men to takeover a fully equipped and going busi-ness of 21 years. If you can pass thisalong to your readers, I will furnishall particulars.

I have enjoyed your publication foryears, in fact we are paid up for thenext three. I hope to at least be ableto keep up with the trade for sometime to come.

WILLIAM H. REYNOLDS, SR.Emerson Park TV & ElectricalAppliance. Service Co.RFD No. 3, Box 217Waycross, Georgia

Comments on ArticlesI would like to say how much I

enjoy reading your magazine. It isprobably one of the finest technicalpublications available.

I am employed as a communica-tions technician with the Ontario Hy-dro Power Commission. While I donot become involved in TV servicing,we are involved in FM, AM, SSB,microwave and multiplex systems(not to be confused with transmittedradio multiplex).

One feature which I think yourreaders might find enjoyable would bea series of articles on the early historyof electronics. I think it would makea fine series.

I am interested in obtaining a com-plete set of your "SemiconductorsFrom A to Z" series. Would this beavailable in book or pamphlet form?Unfortunately, I started to get yourmagazine about halfway through theseries.

EDDIE LEHMAN

The "Semiconductors From A toZ" series was printed in book formby Tab Books and the book is now inits second printing. The book hasbeen listed in many of their advertise-ments in ELECTRONIC TECHNICIAN/DEALER, as well as being listed in La-fayette Electronic Corp.'s 1970 cata-log. Ed.

. for more details circle 116 on Reader service Card

3 ELECTRONIC TECHNICIAN/ DEALER

0

0

When

RC

Aengineers.

put their minds

toantennas,

outstanding thingshappen:

RCA PermacifirPermacolor is not justan improved antenna,it's a completely newantenna. New in looks.New in design. Very easyto set up and install.

And Permacolor ismanufactured exclusivelyby RCA. Here are a fewof its many uniquefeatures:

PermanentConnections.Any antenna is aspermanent as itselectrical connections.Particularly between theelements and the feedline. If a connection fails,

ghosts,streaks,"noise,"even pttoiotanl

failure mayoccur.

On a Permacolor analuminum strap solidlyconnects every activeelement to the feed line.Connection failure isvirtually eliminated.

Tuned Circuits.Permacolor elementsare integral parts oftuned circuits and manyperform more than onefunction. Circuits stay"perma-tuned" becauseelements are permanentlyconnected.Feedlines areunbrokenaluminumstripsperfectlybalanced foroptimumimpedance match andminimum ghost pick-up.

RevolutionaryInsulators.Permacolor insulatorsare polypropylene, atough, flexible, water-proof plastic w thsuperior electricalproperties. Their uniquedesign includes manyribs and barriers to makeleakage paths longer.

On a Permacolor,elements do not pivot.Instead, the elements are

assembledright into theinsulators. Eachinsulator, gripping5V2 inches ofelement, pivotsas a unit. Whenthe Permacolor

unfolds, insulators snapin place and permanentlylock to form a rigid truss.There's no point of high

stress along the entireassembly.

SuperiorCombinations.UHF and VHF get biggerboosts on Permacolorcombinations. On thecorner reflector, theangle is increased to110° for optimumefficiency. And for thefirst time, a bow tie isincluded. This besttype of UHF dipole isintegrated into a singledownlead, made possibleby a newly designedthree -tuned -circuitcoupling/isolatingnetwork.

Permacolorcombinations areuncompromising all -channel antennas.

Square Boom.A square boom supportsthe Permacolor.And it isn't a feed line-it's at ground potential.Detuning effects thatoften occur when agrounded mast iscoupled to a signalcarrying boom areeliminated.

The mast clamp is heavyplated steel and locks

around the boom withoutrivets. A double set ofserrated teeth take avise -like bite on the mastto prevent slipp ngor twisting.

Goes Up Easier.A Permacolor goesup in one piece. On theroof. Not on the ground.There's no bagof parts. There'snothing to takeapart. Aninstaller's jobhasnever beeneasier or faster.And installation is just aseasy on larger models.A double boom givesadded strength, yet takesup only 10 inches onthe mast. This allowsPermacolor to beplaced closer to a

ncn

rotator, thus minimizingstress on the rotator aswell as the mast.

Tough Finish.Permacolor has atough blue and gold vinylfinish on all aluminumparts-even the hiddena-eas. It's similar to thelong-lasting coating on

aluminumsidingfor homes.

There's notanother antennalike the new,trim, cean RCAPermacolor.

See the complete line ofPermacolor antennastoday. Your RCA Partsand AccessoriesDistributor has them now.Parts and AccessoriesDeptford, N.J.


TECHNICAL DIGESTThe material used in this section is selected from informationsupplied through the cooperation of the respective manufacturers or their agencies.

MAGNAVOX

Record Changers ModelW624-W800-Intermediate Gear Alignment

Reports from the field indicate that the intermediate gear(Part No. 76130310), which is part of the immediate gearand striker assembly Part No. 76130389 is being replacedunnecessarily in attempts to correct changer cycling prob-lems. The gear is assumed to be at fault because of the twoshaved teeth adjacent to the end of the striker level whichare a- part of the normal design. Some confusion resultsfrom the early design of this gear that had only one toothshaved. The additional shaved tooth was incorporated laterto prevent a condition of continuous cycling.

The general cause of improper cycling has been foundto be a mis-aligned intermediate gear center post. Twosymptoms can result if the post, which is part of the inter-mediate gear lever assembly, is incorrectly aligned. If thepost is bent away from the turntable gear, the intermediategear and turntable gear can lose mesh at the shaved inter-mediate gear teeth. This will cause failure to complete thechange cycle and is generally accompanied by a chatteringsound as the turntable gear slips against the shaved teethof the intermediate gear.

The second symptom is caused if the post is bent awayfrom the axis of the main cam gear. This condition cancause the intermediate gear to "climb" the main cam gearand lose mesh with the main cam gear. When the out ofcycle condition exist, the intermediate gear is not allowed toretract when the main cam gear reaches the neutral posi-tion. Symptoms may include failure to reject and chattering.

Either of these symptoms may be corrected by removingthe intermediate gear and re-forming the intermediate gearcenter post so it is perpendicular to the changer baseplate.After this adjustment has been made, replace the interme-diate gear and run the changer through cycle several timesto be certain there is positive mesh between the interme-diate and turntable gears, particularly at the point wherethe teeth are shaved. Also check to be certain the teeth ofthe intermediate gear have some clearance from the lowerlip of the main cam gear. In the neutral position thereshould also be approximately 1/32in. clearance betweenthe intermediate gear and the turntable gear.

MOTOROLATV Chassis TS-599-Circuit DescriptionsPower Supply

A single -winding auto transformer provides the voltagesViRT

SEE

CRT

3 Ac

to operate this receiver. The winding is center -tapped tochassis ground and taps on each side of center provide 6.3v

:EAR. 140m.

00

30

necessary for the cathode ray tube employed on this newchassis.

Full -wave recitation and filtering provides a 70vdc out-put from the filter to the vertical circuit. The 70v line isfurther filtered through two separate RC filters and pro-vides 60v to the horizontal output and 30v for the re-maining circuits.

Horizontal Sweep Circuit

The horizontal sweep circuit of the TS599 chassis issimilar to several other Motorola transistorized horizontaloutput circuits. However, several modifications and addi-tions are incorporated.

.10R1200, ER

111

ACCGOK

140RIZOUTPUT

.01

RFC

DAMPER

COOIC00-2 OCT.

SOLiSTATENV PECT

7

CE530-0

CRT ANODE

FOCUS 900

SPOTKILLER

4.00

VIDEOAMP4-170

5 71,6 ITS 5991 How CO

The positive going pulses generated during retrace areapplied to two diodes, DI and D2. Filter capacitors Cl andC2 provide the 170 and 400vdc outputs. The 170 line isused for the video amplifier and the 400v line supplies boththe focus and spot killer circuits.

The horizontal coils of the yoke are tapped on the trans-former primary, but dc decoupled by a capacitor so theyare at ground dc. High voltage for the CRT is providedthrough a solid-state HV rectifier.

Spot Killer Circuit

The purpose of the spot killer is to eliminate the linger-ing spot on the CRT when the set is turned off.

With the receiver on, the diagram illustrates the spot

El66K

RK

70

cQI)R9

22K

.170

BRIGHTNESS

RSMEG

±_ soosT

killer transistor Q1 is essentially a switch. The collectorvoltage of QI is derived from the boost voltage and in thebase circuit, RI and R2 form a voltage divider from a+70vdc supply and serve to bias Q1 into saturation. The


'' 3' V 'if V ; /,. % ' 1,1% i; ',. , - .; //

DEPARTIVIENIVVENWI I KfNit CK 3

\A\ \\

To service Color TV you need:

1. vectorscope

2. color bar generator

and you can't

use one withoutthe other!

One YearWarranty

portable

for homeor shop

only the V7 gives you both

The only complete one unit color vectorscope/color-bar gen-erator available anywhere!

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The only one with detailed instructions on color circuit align-ment and color adjustment. And, additional instructions areavailable as new sets are introduced!

Recommended by leading TV manufacturers! Proven performance . .. over 4 years of use in field and shop

by thousands of technicians . . . no other vectorscope manu-facturer can make this claim!

V7 Checks and aligns demodulators to any angle. Checks and aligns bandpass-amplifier circuit. Pinpoints troubles to a specific color circuit.

Exclusive Features: Self-Calibrating-adjust timing circuit with-out external test equipment, Dial-A-Line-adjust horizontal lineto any width from 1 to 4. Plus: All Crosshatch, Dots, and ColorPatterns; Voltage Regulated; Fully Enclosed Cable Compartment.Free copy of Wayne Lemon's Book, "Color TV ServicingSimplified with Vectorscope'.' Net 19950

Remember . . . V7 - the complete one

Ilk See your distributor or write Dept. ET -5

-LECTROTECH, INC.4529 North Kedzie Ave., Chicago, III. 60625


TECHNICAL DIGEST

Q1 collector impedance is a very low value (essentially ashort) as represented by the switch. R4, RS and QI nowact as a voltage divider and apply the correct grid biasto the CRT.

When the receiver is turned off, the voltage applied tothe Q1 transistor base circuit decays faster than the boostvoltage. As a result, Q1 is no longer forward biased and isessentially an open circuit. The "switch" is now open andthere is no longer a voltage divider.

The boost voltage is applied through R5, to the controlgrid of the CRT. Control grid, GI is now highly positive,at the same time the cathode voltage is near ground po-tential. As a result, the CRT conducts heavily and dis-charges any remaining charge at the anode and the spotis "killed."

Video Expander Diode

The video expander diode allows greater contrast on thepicture tube. This is achieved by eliminating the syncpulses of the incoming composite video signal from the

010 sorlI0ESSED

FPCM/or VIDEO AMP VIDEO OUTPUT

-- FULL VIDEO APPLIED ro Cr

170 D.

I Jtl

linear conduction range of the transistor.The diode is in series with the contrast control and an

RC circuit in the emitter return. The diode acts to biasthe transistor just at the point of conduction for the ped-estal level of -the incoming signal, with the negative -goingsync pulses below conduction. Sync pulses are 20 percentof the composite signal, which means that without thisdiode only 80 percent of the input swing can be for "blackand white" information.

RCA VICTORStereo VIT/YMT Series-Center Lid Opening

Instruments using the center lift lids may be receivedwith the lids jammed in the closed position. In most cases,this is caused by either a small amount of "Spray Lacquer"binding the hinges or the foam block placed between thelid and latch (for shipment) has been inserted wrong. Ineither case, follow the procedure outlined below.

weir,

Adjustment screws

E00

Cabinet Rear

0 0 0

( I ) Turn the adjustment screws (hinges) clockwise asfar as possible (maximum tension). (2) Press down firmlyon the lid to release the latch. (3) Open and close the lidseveral times to free the hinges. Then remove the foamblock and clean any bits of foam out of the latch. (4) Read-just spring tension so that lid lifts 6 to 8in. when unlatched.


POWERFUOne $100 Winegard Color-Wedge equals theperformance of twelve ten -element yagis!

Sound impossible?Then try one for yourself and see what apowerful performer the Winegard Color -

Wedge is. Also available in the popular82 -channel version with comparableperformance on VHF -UHF -FM(CW-1000, $100.00 list). Model CW-2000

VHF -FM$100.00 list

Channel

2

4

6

7

10

13

example A:CHECK DB GAIN

CW-2000 10-Elem. Yagi

7.2 7.8

7.2 7.6

7.4 8.0

12.2 10.8

11.4 11.0

12.0 11.5

Winegard .CoOgight 1969

ANTENNA SYSTEMSWINEGARD COMPANY 3019-13 KIRKWOOD STREETBURLINGTON, IOWA 52601

example B:CHECK DIRECTIVITY

\q/Channel 2 CW-2000

P/Channel 4 CW-2000 Channel 6 CW-200C

N

Channel 7 CW-2000 Channel 10 I CW-2000 Channel 13 CW-2003

example C:CHECK FRONT -TO -BACK RATIO

CW-2000 CH. 2 CH. 4 CH. 6 CH. 7 CH. 10 CH. 13DB 22 26 17 20 35 30

MAY 1970

SEE YOUR WINEGARD DISTRIBUTOR AND WRITE FOR FACT -FINDER #284... for more details circle 143 on Reader Service Card

39

COLORFAXThe material used in this section is selected from informationsupplied through the cooperation of the respective manufacturers or their agencies.

MAGNAVOXFocus Transformer Part No. 360957-6-Terminal Identification

4 There is apparently some confusionin the field concerning the identifica-tion of terminals on this transformerwhen it is used as a replacement forthe 360957-5. There is a blue dot lo-cated between terminals 3 and 4, how-ever, this dot is not always clearly vis-ible. The best way to identify these

terminals is to view the transformer from the rear as illus-trated and count the terminals clockwise from one to four.

Color TV Chassis 1935-Horizontal Retrace Blanking

Early production models of the IT5007, which uses theT935 chassis, could exhibit a horizontal retrace blankingline on the left video of the screen. This line shifts in theopposite direction of the video information when the hori-zontal hold control is adjusted.

The problem can be corrected by adding a series net-work consisting of a 15K,1/2w resistor and a 1000pf, 500vcapacitor between .113 (GI of the CRT) and the junctionof R406/C403. This circuit has been incorporated in laterproduction.

Color TV Chassis 1940-Increasing Range of ACC

A recent production change has been made in the T940chassis changing RA26 on the ATC board from 10K to 47K

SOOSCOOK; .

SOW.

;t2

AO

CHANGE TO 47K0026.00

tit>

AUTOMATICTINT

CONTROL.10

I Oa.TIM

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itrlit, 1

IMTO I

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305

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Remote Control Model 1C6313-Remote Sensitivity Control

If you' should encounter a Model 106313, using theT939-06 chassis, on which the remote sensitivity controlseems to have no effect, check the wiring of the control. Ifthere is no connection to the center tap of the remote sensi-tivity control, connect a jumper wire between the center tapand the end terminal having the red wire connected to it.

RCA VICTORColor Remote Control TV "0" Series-Pilot Lamp Lead Dress

The remote color television receivers referenced to thisbulletin use a twin -lead for power to the pilot lamp. Insome instances (specifically after normal service operationsand during reinstallation of the tuner mounting assembly),the "high" side of the lamp power lead could be accidental-ly "pinched" between the TMA bracket and chassis "short-ing" the lamp to chassis. The following corrective steps areto be performed when the referenced receivers are serviced:(I) Make a visual check of the pilot lamp supply lines(twin lead) to find out if lead has been "pinched" or"shorted" by TMA bracket. (2) If lead has been pinchedor shorted, remove TMA and place a "spaghetti" sleeve

COO, i6...

over the pilot lamp leads. (3) Check physical location of

in value. This change provides an increase in the range ofthe Automatic Chroma Control circuit to compensate forwider variations in chroma level in the transmitted signal.

Color TV Chassis T924/T939-Purity Shift

Some of these chassis have evidenced a tendency to shiftpurity when the instrument is turned on within a five min-ute period after having been turned off. The purity shift isnot evident, however, if the set has been turned off for aperiod of time longer than five minutes. This problem canhe eliminated by adding a 68K resistor across C302, in thepower supply. This change has been made in later produc-tion of the T939 chassis.

TMABRACKET

TMA SIDE VIEW

R9518-n-1/2

RELOCATEAWAY FROM

MOTORS

UHF

TUNER

pilot lamp series resistor R95 ( 1 8,11 1/2w). This resistor,shown in illustration, may be located in close proximityto the color remote motor. Take corrective action necessary(relocate terminal board leads, and/or "body" of resistor)

continued on page 70


HE ATHK I T

'119 710'FREE 1370 CATALONow with nore kits, more color- nFully di:scathes thesa along wttover 300 nits for stereo/hificolor TV, dectroni: organs, guitar amplifiers. amateur radiomarine, erucationel, CB, hoer& hobby. Mail coupon or writ.heath Corniew Beaton Harbor.

StackThese Up

Against The Othersyour best buys in meters

come from HeathFor over 20 years, Heath has been the first choice in me-ters for tens of thousands of service technicians, schoolsand home labs. There's a reason for this continued pop-ularity - Heath meters are designed to have that balanceof versatility, needed features and low cost that makethem your best buy. For the price of just a couple of metersfrom others, you can buy every meter Heath makes. Webelieve that you should still be able to get a stack of meterswithout spending a pile of money. When you need a meter,look to Heath. For performance, versatility and top dollarvalue, the others just don't stack up.

co $21.95- Buys A Portable Solid -State Volt -Ohm -Meter.Four ranges on AC & DC vclts measure 1-1000 volts fullscale. Four resistance ranges measure 0.1 ohm to 1000megohms. Features convenient battery operation ... zero& ohms adj. controls ... DC polarty reversing switch ...spare jack for HV & RF probes ... rugged polypropylenecarrying case. IM -17, 4 lbs.

0 $31.95' Buys A Portable Volt -Ohm Milliammeter.Measures AC & DC volts 1.5-5000 full scale. DC currentfrom 150 uA to 15A. Resistance midscale from 15-150,000ohms. Large 4!,:," 50 uA movement meter for extra ac-curacy. MM -1, 5 lbs.

0 $29.95' Buys An Accurate VTVM. 7 AC & DC rangesmeasure RMS volts from 1.5-15000 full scale ... AC P -Pfrom 4.0-4000 ... 7 resistance ranges from 0.1 ohms to1000 megohms. 25 Hz - 1 MHz response. Single probemakes all measurements. I M18, 5 bs. Assembled IMW-18,5 lbs. ... $49.95'

0 $41.95' Buys A Laboratory AC VTVM. Especially use-ful for low-level AC & audio work. Ten RMS ranges from0.01-300 V full scale . . measures dB from - 52 to +58.+ 1 dB response from 10 Hz -500 kHz. 10 megs. input im-pedance. IM -38, 4 lbs. Assembled 'MW -38, 5 lbs...$49.95'

0 $39.95' Buys A Big Service Bench VTVM. Has thesame high performance as the IN1-18 above, plus addedfeatures to make it more useful fcr service work .. . sepa-rate 1.5 & 5 VAC scales ... calibration controls that areadjustable from the front panel .. versatile gimbal mount-ing ... large 7" meter. IM -28, 7 lbs. Assembled IMW-28,7 lbs. ... $59.95"

0 $46.95' Buys A Big Solid -State Volt -Ohm Meter. Bat-tery -powered portability plus built-in AC supply. 8 AC & DCranges 0.5-1500 full scale ... 7 resistance ranges (10 ohmcenter scale) xl-xl meg. High input impedance & 6" meterfor greater accuracy. IM -16, 10 lbs. Assembled IMW-16,11 lbs. ... $69.95'

0 $85.00' Buys A Deluxe Solid -State Volt -Ohm Milliam-meter. 9 AC & DC ranges from 150 mV -1500 V full scale... 7 resistance ranges measure from 1 ohm to 1000megohms 11 current ranges from 15 uA-1.5 A fullscale. 100 kHz response ... high input impedance ...large 6" meter with zero center. I N1-25, 10 lbs. AssembledIMW-25, 10 lbs. ... $120.00"

111111=01a Schlumberger company

HEATH COMPANY, Dept. 24-5Benton Harbor, Michigan 49022

ti Enclosed is $ plus sh pping.

Please send mcdel (s)Et Please send FREE Heathkit Catalog. 0 Please send Credit Application.

Name

Address

City'Mail order prices: F.O.B. factory.

State ZipPrices & specifications subject to change without notice. TE-221R

MAY 1970. . . for more details cir:le 120 on Reader Service Card

41

You'll see better ideaszilclear through Ford's EconolineSmall wonder it outsells all other vans

Twin -I -Beam ride. The independ-ent front suspension made famousby Ford pickups: Twin -I -Beam.Two I-beam axles for strength...big coil springs for easy ride.Twin -I -Beam gives you greaterstability, less wind wander, anda better ride. Only Ford has it.

"Walk-thru" to rear. Because the en-gine is forward out of the way, thedriver can step from his seat into theload area and exit through side orrear doors. The loadspace is not onlybigger than in older vans, it's easier toreach. See all the better ideas in thebest selling van at your Ford dealer's.

Outside service center. Just raisethe hood, and all these servicepoints are at hand: oil, water,battery, windshield -washer water,wiper motor, brake master cylin-der, voltage regulator. Ford'sbetter idea vans make every-thing you do easier to do.

Greater payload than ever before.Now Ford vans can take on loadsthat vans never before were de-signed to take. Choose from threeEconoline series and two bodylengths. Power choices includetwo economical Sixes and a top -performance 302 -cu. in. V-8.

FORD ECONOLINE VANS42

. . . for more details circle 114 on Reader Service CaraELECTRONIC TECHNICIAN/DEALER

We've finallysucceeded in dividing the country.

Nothing military. Simply a 5 -waysplit, so that we can offer you aPanasonic Replacement Part Depotclose enough to call home.

Our intention is not to sell you partsIto put in other manufacturer's products.

(Although you may wind up doingjust that!) All we want to do is to pro-vide you with genuine Panasonic partswhen they are needed.

Last year alone, several millionpeople bought our TV's, radios, phono-graphs, tape recorders, etc. And whilewe don't manufacture our productswith planned obsolescence in mind,

LOS ANGELES2121 Yates AvenueCity of Commerce, Calif. 90022(213) 723-6271TWX 910-580-1960

: ......

DALLAS4202 Harry Hines Blvd.Dallas, Texas 75219(214) 521-4582TWX 910.861-4539(Includes Memphis, Tenn.)

certain parts will wear out. No amountof quality control can put an end tothat. So when a customer with aPanasonic product comes in and youdetermine that it requires a cart whichis not in your inventory, don t turn himaway. Order a genuine Panasonic part.

A part which is more than just areplacement. Because each and everyPanasonic component is made byPanasonic, engineered by our scientistsand technicians to provide maximumefficiency and reliability. Quality Con-trol is not just another factor in ourmanufacturing process; it is our manu-facturing process.

p1

CHICAGO371 N. 3rd Aven JeDes Plaines, Illinois 60016(312) 299-8886TWX 910-233-2641

Take tubes and transistors, for in-stance. F01 TV. For radio. You name it.Nobody in- the world makes a bettertube or transistor than Panasonic.That's a fact. And we know that nobodycan fool you about component quality.

One last thing. When you replacePanasonic with Panasonic, you won'thave to concern yourself with callbacks. We make it right the first time.

So the next time you don't find whatyou're looking for on the shelf, orderit from the Panasonic Parts Depotserving yon. Panasonic parts forPanasonic products. It makes sense.

NEW YORK10.16 44th DriveLong Island City, N.Y. 11101(212) 973-896ETWX 710-582-2555(Includes Akron and Cleveland, Ohio)

........

*

ATLANTA2 Meca WayDuluth, Georgia 30136(404) 448-2456TWX 810.766-4514

,5) Matsushita Electric Corporation of AmericaNational Headqt. arters, Service and Parts Division10.16 44th Drive, Long Island City, N.Y. 11101just slightly ahead of our time.

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

PANASONIC

Areyou goingto sit on the sidelines

allyour life?

Don't get the idea it's safer sitting onthe bench than joining in the battle.

The battle your community isfighting right now isn't going to stayin the playing field. The battle againstcrime, against drugs, against despair,against deprivation. That battle is

going to spill all over the sidelinesand into the stands.

It already has, in many places. Andit can do it again. Here. Unless youget up off your big fat complacencyand into the fight. Unless you give ahand to those who are working to

solve the problems-the volunteers ofthe United Way agencies.

They know the problems. Theyhave a lot of the answers. But theyneed you. Your strength. Your enthu-siasm. Your know-how. Pick anagency that interests you. Call upand make a date to see how it works.

Who knows? You could find thebattle more satisfying than the side-lines. And in the long run, you mayfind it a lot less risky.

This year, give more than money.Give you.

Space contributed as a public service by this magazine.


ELECTRONIC TECHNICIAN/ DEALER MAY 1970

TEKLAB REPORT

Receiver service by panel substitution hassimplified trcubleshooting-but in-depth servicingrequires circuit knowledge

Introducing Motorola'sQuasar II Color TV

Expanding the "works in a draw-er" concept Motorola introduced theQuasar H, employing the TS -934color chassis. The plug-in panel ar-rangement used in this chassis issimilar to the TS -915/919 chassiswhich is the top of the line chassis.

The TS -934 hybrid chassis em-ploys six mini -circuits that plug-inand are all solid-state with the ex-ception of four tubes.

Tubes are employed in the verti-cal oscillator and vertical output,horizontal driver, horizontal outputand damper circuits.

We found a number of importantfeatures employed on this chassiswhich include: Automatic Fine Tun-ing (AFT), transformer powered,solid-state HV rectifier, automaticdegausser, integrated circuits used in

the sound and color demodulators,regulated low voltage supply, auto-matic color control and double gatedautomatic control.

Viewing the set from the front wefound the customer controls conve-niently located on the front panelwith the exception of the horizontalhold control which is located on thechassis but should seldom need ad-justing, and the TINT control whichis employed on the TS915/915chassis is eliminated.

The chassis can be pulled forwardfor servicing, by removing one 1/4 in.hex head screw near the ac interlockand releasing the chassis lock. Thiscan be done without removing theback cover.

After we pulled the chassis for-ward a number of features were re-

Motorola's Quasar IT Model WT678FW, employing the TS934 Color Chassis.

MAY 1970.15

BrightG2Red

ToneMasterBright

ContrastG2Blue

Vert.G2Green

Hue

Intensity

A flip -down panel conceals the hollow shaft dual purpose controls. The two-color controls are theslide throttle type for the adjustment of the color and hue.

vealed of interest to the service tech-nician. The convergence panel is upfront, the tuner is placed in the openfor easy cover removal if cleaningis needed, and by removing threescrews the control panel swings openon a hinge for component and con-trol replacement if needed. The tun-er has provisions for 300 or 7551

input.The panels are conveniently lo-

cated and all the panels can be re-moved with the chassis pulled for-ward and the components can bechanged without removing the chas-sis from the cabinet.

If it should become necessary toremove the chassis, all wires haveMolex connectors and by releasing achassis lock the chassis can be re-moved from the slide rail mounting.

Viewing the set from the rear wefound the low voltage transformerand horizontal output circuitsmounted on a separate chassis in thecenter rear portion of the cabinet.

Many of the service controls thatare adjusted during the set-up pro-cedure are factory pre-set and nor -

malty require no adjusting. The con-trols in the HV circuits are cement-ed and require no adjustments, butif component replacement is neces-sary make sure you use exact re-placement close tolerance parts.

Troubleshooting by panel replace-ment in home chassis servicing canbe done if you carry a complete setof replacement panels.

The suggested exchange list priceof the panels range in price from$6.50 to $18.00 apiece.

If you should decide to repair thepanel circuits, you should have anidea how the circuits function. Wewill review the new circuits.

This month's TEKFAX schemat-ic No. 1296 has complete coverageof the circuits used in this chassis.

POWER SUPPLYThe power supply shown in Fig. 1

employs voltage regulation on the20v line supplying most of the tran-sistorized circuits. The dc regulatorpanel providing this voltage oper-ates from the 27vac winding on thetransformer. This output is adjust-

able and uses a Zener reference andamplifier. A current limiter preventsthe current from exceeding a pre-determined maximum.

THE DC PATHDC coupling is employed from

the second detector through the"IC" all the way to the CRT. For-ward bias for the first video ampli-fier is established by R 1 and R2.The second video amplifier also con-ducts as a result of voltage appliedto the base from the emitter of thefirst video amplifier.

It is important that the correct dcbe applied to the "IC" as this is thebias voltage for the first stages in the"IC." The resistors R3, R4, R5 andR6 determine the voltage across thecontrast control, the control being apart of this voltage divider.

Because these stages are directcoupled, a defect in the video ampli-fiers can cause a change in bright-ness, as well as a detrimental effecton video. An open video amplifiertransistor, for example, will causeexcessive brightness, whereas ashorted stage will reduce brightness.

ACC AMPLIFIER AND COLORKILLER

The ACC amplifier, shown in sim-plified schematic Fig. 2, is the firststage of a solid-state switch and inthe absence of a color signal neitherstage conducts. When a color signalis being received, 3.58MHz CW sig-nal from the crystal output amplifieris present at the ACC rectifier (inthe amplifier base circuit). The re-sulting positive voltage turns on theACC amplifier and the collectorvoltage drops. Direct coupled to thepreceding stage, this negative goingvoltage turns on the killer transistor(PNP) and the collector voltage be-comes positive. To improve the ac-tion of this circuit, it is made regen-erative by a resistor from the col-lector of the killer and is returned toground through the color intensitycontrol. Positive voltage developedat the collector biases on the 2ndcolor IF amplifier and the gain inthe 2nd color IF is determined bysetting of the INTENSITY control.

Bias for the first color IF is set upby voltage dividers to provide maxi-mum gain, but is automatically re-duced depending on color sync am-plitude. The dc voltage on the col-lector of the ACC amplifier is pro-portional to the amplitude of the


I 601804

tog .1 0,LA, Y.%

-)>-

°S. _1

LI GA uSSING

C011

VS

14 8.3v

9809 100K

LBW

PM, a. utif31 TIMER LAMP

Ds.. 1755

1.801

VHFLAMP0155

LR8 128 R7 4.1

R805 39

43 01

A61

OVERLCAD

VIDEOI CUL8+305V

MEASUREDAT ZERO

BEAM

VERT

o 8++260V

AUDIO

SUPPLY

Bzi 5V

RIG

84 -

Fig. 1-A schematic of the low voltage power supply with voltage regulation on the 20v line wnich supplies mostof the transistorized circuits.

09

A5U

ACC AMP948 2.2M

011

P2S

COLOR 811116

22 22

?UV NV

Fig. 2-The ACC Amplifier and Color Killer circuits.

3.58 CW signal applied to the ACCrectifier. As this amplitude increas-es, the collector voltage on ACCamplifier decreases, forward biasesthe ACC delay diode and reducesthe gain of the first color IF.

CRYSTAL DRIVER, AMPLIFIERAND 3.58MHz OSCILLATOR

The crystal driver stage receivesthe 3.58MHz color sync signal fromthe gated color sync amplifier. This

02M4841

25iD COLOR IF

is an emitter follower stage anddrives the crystal to supply a CWsignal. The 4.7pf capacitor is ap-proximately equal to the crystal ca-pacity to cancel noise which couldotherwise be coupled through thecrystal capacity.

The Q is reduced to increase bandwidth by placing a 39012 resistor inseries with the crystal.

The burst of color sync and theresulting output from the ringing

crystal, is applied to the crystal out-put amplifier. This stage is degener-ative (and dc stabilized) by the100K resistor from collector to base.

The oscillator is a modified Col-pitts, free running at about 3.58 -MHz. It is locked in frequency andphase with the transmitted colorsync when a color signal is received.A very small capacity is used tocouple the 3.58MHz signal to con-trol the oscillator. Output of the os-cillator is taken from the emitterthrough a low impedance -isolationnetwork to the phase splitter. Somephase correction is introduced bythe 5.60 choke.

The crystal output amplifier alsosupplies a 3.58 CW signal to theACC rectifier to develop a positivedc voltage to turn on the ACC am-plifier. The only adjustment in thesestages is the 3.58MHz oscillator coil.

Next month we will review theRed, Blue and Green Video Outputstages, the IC Color Demodulator,Horizontal Oscillator Driver andOutput stages and the Audio IC Cir-cuit employed in this new chassis.

MAY 1970 47

High -Powered Tuner Amplifiersby HOMER L. DAVIDSON

Some fairly simple servicing techniques can be

developed by technicians that understand how these

solid-state amplifiers function

Some of the amplifiers found insolid-state AM -FM tuners are ratedas high as 50 to 500w. These deluxestereo models may incorporate up to50 transistors and 25 diodes, andtheir frequency response usuallyranges from 25Hz to 22kHz.

Most stereo combinations usefrom 6 to 12 speakers, includinghorns and additional speaker jacks.These speakers may be in a combi-nation cabinet or in separate shelfand console floor models.

The solid-state circuits are quitecommon throughout all AM -FMtuners. Some models do have addi-tional features within the tuner cir-cuitry. This service article, however,deals primarily with the audio por-tion of these units.

CIRCUIT ISOLATION

Before attempting to signal tracethe defective stage of the audio am-plifier, try to isolate the trouble toa given section. Should the tunersection be functioning properly, thenthe trouble must lie in the audio por-tion. See if the stereo phonographplays through both audio channels.Also, see if the FM stereo multiplex

section is functioning normally. Forinstance, if the stereo multiplex sec-tion is functioning and one channelis dead on phono position, suspect adefective phonograph cartridge. Ifthe phonograph section is normal,but FM stereo music comes fromonly one set of speakers, suspect adefective multiplex section. Alwaystry to isolate the trouble to a cer-tain section of the AM -FM chassis(a block diagram of one such chas-sis is shown in Fig. 1).

Select the proper circuit diagram,isolate and locate the troubled sec-tion upon the diagram and chassis-most tuner -amplifier sections arestacked and these units must be sep-arated if the audio portion is to beproperly serviced. Always take a topand bottom layout view of the iso-lated section (Fig. 2), making sureyou have the correct section beforeattempting to locate the defectivecomponent.

SIGNAL TRACING

A defective stage in the audio sec-tion can be located with either signaltracing methods or voltage measure-ments. An audio -signal generator

Fig. 1-Block diagram of a typical solid-state stereo amplifier.

LEFT

INPUTS

RIGIll

INPUTS

PJ

PREAMP TONE AMP

PRE.]AMP

PRI

AMPI

PRE.

AMP

PRI

AMP

Al Al IOU

AMP AMP lII IIR

TODIREB1'!). 'CDCOTIT.

AF

NAP -AP

AMP

MAIN AMP

Af AE

DRIVER

IOU AI

ER AM

Af

AMPDRIVE R

OUTPUT

-Our PUT

[RII PUI

00 Pl11

51"1,

(possibly of pencil -type design)should be used in locating weak- orlow -signal conditions. Start with thevolume control and go from collect-or to base of each audio stage. Inhigh -grain pre -amplifier and driverstages, simply touch the pencil probeto the metal cover of each transistorand notice the gain of each audiotransistor.

If the pre -amplifier (Fig. 3) anddriver (Fig. 4) stages are not per-forming, start at the audio outputtransistors and work towards thevolume control. Dead channels areeasy to locate, while intermittent andlow -signal losses are more difficult.Use a scope in conjunction with theaudio -signal generator to locate aweak stage, comparing the weakstage with the good audio channel.

Many times when an audio -signalgenerator or VTVM test probe isapplied to the base terminal of a sus-pected transistor, the stage will be-gin to function. Normally, this tran-sistor is intermittent and should bereplaced. Do not overlook the pos-sibility of a second defective tran-sistor in a directly connected tran-sistor stage. Be very careful not toshort the base and collector termi-nals together with the test probe.

VOLTAGE MEASUREMENTS

After the defective stage has beenlocated, take voltage measurementsof the suspected transistor, usingeither a VTVM or FET VOM forcorrect low -voltage measurements(Fig. 5). When one transistor is de-fective, erroneous voltage readingswill be noted on direct -driven tran-sistors. This makes it much moredifficult to locate a defective tran-sistor with voltage readings in a di-rect -driven circuit. Generally, thetransistor with the greatest change involtage is the defective one. The sus-pected transistor should be removedfrom the etched board and tested.

Collector voltages in the pre -am-plifier section will vary from 2.5v to16v. Emitter and base voltage read-ings are from 0.12v to 2v. Remem-ber that voltage readings taken inthe pre -amplifier circuits are verylow compared to those in the mainamplifier section.

The audio -frequency and drivertransistors have collector voltagereadings from 2.5v to 35v, whilesome power output collector volt-ages may go as high as 75v. Emi

and base voltages are from 0.12

ELECTRONIC TECHNICIAN:DEALER

8v, while in the direct -driven circuitsthe collector terminal of the firsttransistor and the base terminal ofthe driven transistor have the samevoltage.

Resistance measurements withinthese transistor circuits are not ac-curate. Base and emitter resistormeasurements should be made withthe transistor out of the circuit.Emitter resistors in the power out-put stages will vary from 0.1811 to0.47f/. Always remove one end ofa suspected diode or resistor to be

sure of a correct reading.

CHECKING TRANSISTORS

In -circuit transistor testing may beaccomplished in the pre -amplifierand driver stages without high -leak-age indications. Even transistors inthe direct -driven stages may show anopen condition. Proper leakage testson direct -driven transistors shouldbe made with either the collectorterminal or the entire transistor re-moved from the circuit board.

Many in -circuit transistor tests

Fig. 2-Check the bottom wiring area with the top section before attempting to remove a defec-tive component.

Fig. 3-A solid-state circuit in the left -channel preamplifier of a typical receiver.

C3INPUT 3.3

)1

R16220 K

al

C31

(

560PF

12V

2.5V

C9100PF

2.5V

C410

OUTPJT

5 6K

4700C I I

will show an open or shorted condi-tion, but a small amount of leakagemay not indicate the transistor pro-ducing distortion. When in doubt,replace the suspected transistor.Transistors cause about 75 percentof the trouble found in the audiosection. When making transistortests, make certain that the transistorpolarity switch is in the correct po-sition. Leakage readings are veryhigh when the polarity is wrong.

It is best not to use an in -circuittester on a suspected intermittentaudio transistor. In many instances,when a beta tester is attached the in-termittent transistor will "pop" on.

Several tests should be made be-fore removing the suspected transis-tor. An intermittent transistor canbe located by applying heat orsqueeze spray. Always have the au-dio section operating when sprayingthe suspected transistor. Spray thetransistor several times before re-moving it. Sometimes intermittentplastic transistors begin to act upwhen twisted. Double check the sus-pected transistor with a transistortest out of the circuit.

When one power output transis-tor has a shorted or leaky condition,always check the other power tran-sistors. These transistors can bechecked in the circuit with their col-lector terminal wire removed. Re-member, power output transistorleakage readings are very low com-pared to other audio transistors.Properly matched audio outputtransistors will have close beta andleakage readings.

TRANSISTOR REPLACEMENTAlways test the replacement tran-

sistor before mounting it on theprinted -circuit board. Be very care-ful not to damage surrounding com-ponents when soldering connectionson the etched board, and use a heatsink or a pair of long -nose pliers toprotect the new transistor whin sol-dering the small terminal wires.Make sure the replacement transis-tor terminals are not touching othercomponents.

Apply silicone grease to both thepower transistor and its heat sink.Check to see if a thin piece of insu-lation had been used between thetransistor and heat sink. It should bereplaced if a new one was providedwith the replacement transistor. Re-place the small plastic insulators (iffound) between the transistor and

MAY 197049

mounting screws. Before connectingthe terminal wires, take an ohmme-ter reading between the transistorbody and metal heat sink. This maysave hours of frustration. A shortbetween the heat sink and transistorcan produce distortion and arcingconditions.

Both power output transistorsshould be replaced when one isfound to be shorted or leaky. When

exact transistor replacements are notavailable, a matched pair of univer-sal power transistors should be used.All power transistors should bechecked in both stereo channelswhen one or more leaky transistorsare found.

AUDIO DISTORTIONExtreme audio distortion is gen-

erally found in the power output

802SC35.

C8/

I5V

2.5V

RIB320

R16 R351000K IK

C9

CI721'0

VP25CK

-CII47

R19BOBI

CIO100pf

1 CI9- 220

V 73 LEFTCHANNEL

R25 DEFECTIVE2.2K TRANSISTOF 3

4 7KR22

05

07

RI6500

35V

0725627

:22500 .45

052%29235V

R25330

R2756

0625E142.

6V

R23 R28100 330

35V

POWERPLUG

68V042 5046

C14

0525046

R8.330IW

Fig. 4-A solid-state main -amplifier circuit in the rigft channel of a Kenwood Model 'K88U receiver.

Fig. 5-Taking voltage measirements in the audio output stage of a General Electric chassis.

stages. When very weak sound andextreme distortion occurs, it canusually be located by power tran-sistor replacement. It is also helpfulto check for visual signs of burnedbias resistors around the powertransistors, following the circuitfrom burned resistor to correspond-ing power transistor. Always checkthe condition of the base- and emit-ter -bias resistors when a shorted orleaky power transistor is found.

Very weak distortion can be lo-cated with an audio -signal generatorand scope. After using these test in-struments to locate the distortedstage, make voltage measurementsand test the suspected transistor outof circuit.

When distortion is noted in thepre -amplifier or driver stages, com-parison tests can be made againstthe good audio channel. Feed thesame audio signal into both chan-nels and take comparison waveformsof each stage, suspecting a defectivetransistor or bias resistor as thecause of distortion. A dried out orleaky coupling capacitor may alsoproduce weak or distortion condi-tions. Distortion meters are handytest instruments for locating distor-tion problems, but they usually arequite expensive for the small serviceshop.

DEFECTIVE POWER SUPPLIESMost tuner amplifiers have power

supplies containing transistor andzener diode voltage regulation (suchas the power supply shown in Fig..6). They generally also contain astep-down transformer in either abridge or fullwave rectifying circuit,using single or multi -section siliconrectifiers. A defective power supplyshould be suspected when no soundis heard in either audio channel.

Most power supplies are protect-ed by low -amp fuses or circuitbreakers. When fuses are beingblown as the power switch is turnedon, suspect a shorted silicon diode.Should the fuse blow after somesound has been heard, there is prob-ably an overloaded condition in thecircuits connected to the power sup-ply.

If the power supply seems defec-tive, check the condition of the sili-con diodes. A good diode will mea-sure I On in one direction, with noresistance reading when the testleads are reversed. Always removeone lead of a suspected diode for


42V 0---

36V

I7V

15.5V

DI33VAC

T.,

T °'

T,...

021 REG

.°'

101

T

I4V

.01 6811

4711

XIREG

L2

6811

4.7K

50

D2

6 VAC

33 VAC

117 VAC

rig. b-most tuner amplitiers nave power supplies containing transisto. aria zener aioae voltageregulation.

DRIVER

BOTH COME INKIT 324 - 6005

27.5V

47(-1

Fig. 8-The audio output circuit in a Philco N255T chassis.

correct resistance measurement.Most silicon diodes will appear openor shorted, and one or more diodesmay be damaged in a bridge -typecircuit.

When overloading conditions existoutside the power supply, try to iso-late the defective stage. Insert a cur-rent meter in the power supply volt-age source and clip off each wireleading to tuner and amplifier cir-cuits until the overload condition is

AUX. SPK JACK

V

.22 SPK.S.

500

indicated. Most overload conditionsare traced to the power output stagesof the amplifier.

Excessive hum in the speaker canbe caused by a defective transistoror filter capacitor. With the volumecontrol turned down, isolate the humin either the amplifier or tuner. Mostloud hum conditions are traced tothe filter decoupling capacitor net-works. Shunt a large electrolyticcapacitor across the suspected filter

C137035V 1.SPEAKER

Fig. 7-A solid-state amplifier circuit in a Ken -wood Model 1(140 chassis.

network before turning the amplifieron-transistors in the power supplyand audio circuits can be damagedwhen shunting a large capacitorwhen the power is on.

BLOWING FUSESA Kenwood AM -FM Model

TK88U would blow 2 amp fuses.The silicon diodes were checked andfound good, and the overloadingconditions appeared to be outsidethe power supply circuits. A 500mameter was inserted in the power sup-ply output and a heavy current wasindicated. Each voltage lead wasthen removed from the voltagesource until the lead containing theoverload was found.

In this instance the overloadingcondition was in the push-pull out-put stages (Fig. 4). Power -outputtransistors Q3 and 05 were removedfrom the circuit and measurementsindicated that transistor Q3 had highleakage. Before replacing the outputtransistor, bias resistances werechecked and a bias diode (D7) wasfound open. Its replacement solvedthe overloading condition.

DEAD RIGHT CHANNEL

The right channel in a KenwoodModel TK140 receiver was dead onboth the FM and phonograph stereopositions. Signal injection indicatedthat the trouble was in the poweroutput stages (Fig. 7). Transistors02 and 03 were then removed fromtheir heat sink and tested. Bothpower transistors had high leakagewith low beta readings. These2SD46-type transistors were re-placed with RCA SK3027 universal-

MAY 1970 51

type transistors, which corrected theproblem.

IMPROPER LOADING

The owner of an AM -FM stereoPhilco combination Model N255Thad connected several outside speak-ers and damaged the solid-state am-plifier. One power -output transistorwas found open and two others hadhigh leakage. The etched circuitboard (Fig. 8) smelled of burnedresistors.

Special output transistors wereordered from Philco as part No.324-6005, each kit consisting of atransistor and a 2.751 emitter resis-tor. All suspected bias resistors werealso replaced, and care was taken tomake certain that all metal heatsinks were replaced and soldered tothe correct terminals on the etchedcircuit board-a blob of soldercould have destroyed the new tran-sistors. Since the separate heat sinkswere located very close together,they were insulated with some rub-ber silicone cement.

DISTORTED AMPLIFIERA General Electric AM -FM

Model RC8571 receiver was foundto have excessive hum and onlyweak reception from one channel.The owner complained of somethingburning. Removing the solid-statechassis revealed a burned bias resis-tor (Fig. 9). The burned resistorwas traced to its respective outputtransistor, which was removed fromthe chassis and found shorted.

Each audio -frequency direct -cou-pled transistor was tested in the cir-cuit since these transistors may havebecome leaky and placed the wrongbias voltage on the base terminal ofthe final output transistor.

WEAK LEFT CHANNEL

Another problem was a weak leftchannel in an RCA RS -215A am-plifier. Signal tracing with an audiosignal generator and scope revealeda weak 2N2614 driver stage (Fig.10).

The transistor was tested in thecircuit and appeared normal. Allvoltage readings were good. Emitter -and base -bias resistors were of cor-rect value. Even the audio -frequen-cy direct -driven transistor was nor-mal. But, when another electrolyticcapacitor was shunted across theemitter bypass capacitor, the volumereturned to the left channel.

AF AMP

-34V

-13.6 V

-.06V

POWER OUTPUT

-.04V

-34V

is.--____ LEAKY POWER OUTPUTBURNED EMITTER BIASRESISTOR

.68 n2W

TO

)1+SPEAKER

500-13.4 V

POWEROUTPUT

.68 n2W

Fig. 9-The audio -output circuit in a General Electric RC8571 chassis.

Fig. 10-The final audio -amplifier stages in an RCA R-215 chassis.

10

-3.6V

DRIVER2N2614 -I2.5V

-3.4V

3300 47n

33K

4.7 K 560n200 T

DRIED -OUT. CAPACITOR-I5V r t-I5V


The Long and Shortof MATV Cablesby ROBERT SHARP and PAUL MILLER

Antenna systems may pick up distortion -free TV

signals, but these signals can become significantly

distorted unless they are transferred to receivers

through a well designed cable system

For over 20 years television hashad a tremendous impact on Ameri-can life. The TV set has become aspopular as the refrigerator andwashing machine. Over 90 percentof the households own at least oneset. Yet, despite this overwhelmingacceptance, the wiring from the an-tenna to the set is generally still thesame sort of jerry-rigged afterthoughtas when antennas first started sprout-ing from house tops in the days rightafter World War II.

This is incongruous. Even a housebuilt in 1970 seldom includes a sig-nal distribution system. Almost in-variably, the new occupant himselfinstalls an antenna on the roof(where no provision for such instal-lation has been allowed) and runs atwin lead down into a window orthrough a wall. An apartment dwell-er must often depend on a portable"rabbit ear" antenna alone. For both,TV watching is usually restricted toone room and reception is poorerthan it should be. Such treatment ofa TV signal distribution system inthis day and age makes about asmuch sense as running electric wiresfrom a power line through a win-dow, hooking it up to a light andsaying, "Well, that takes care of ourelectrical needs."

But things are due for a change.VHF -only black -and -white TV re-ceivers in the past could pick a sig-nal out of almost any kind of anten-na system and make somethingworthwhile of it. This is not so witha UHF signal: when it travelsthrough a dirty old twin lead on arainy night, for instance, its strengthcan be so dissipated that little re -

The authors are electronic wire and cableproduct development engineers at BeldenCorp.'s Technical Research Center.

mains to reach the set. Color setsare even more demanding. They re-quire a strong, ghost -free, undistort-ed signal. It is surprising how manyviewers will purchase an expensivecolor TV set and antenna, and thenconnect them together with lead-inwire in a manner that is electroni-cally about as sound as baling wireand chewing gum.

The plain fact is that many homeTV signal distribution systems arehopelessly outdated. The consumer,architect, antenna -system installerand builder must recognize that thetime is long past due for a changein thinking. They must be sold onthe benefits of a quality master an-tenna television (MATV) systemtechnologically in tune with today'smore sophisticated receivers, anten-nas, transmitters and broadcastequipment-and which comple-ments the tremendous role TV playsin today's entertainment, communi-cations and educational activities.The technology, materials andequipment are available.

MATV systems have beeq aroundfor years. However, because theyhave frequently been poorly de-signed and installed, their qualityhas often left a lot to be desired. Avery large market exists for wellplanned and properly installedMATV systems in hotels, motels,apartment buildings, hospitals, nurs-ing homes, schools, dealer show-rooms-and the home. The home isthe biggest untapped MATV market.

MAW SYSTEMSAn MATV system has one an-

tenna or antenna system serving nu-merous sets (or outlets). The systemis designed so that the sets can betuned to different channels at thesame time without affecting one an -

MAY 1970 53

other, allowing each set to receivesatisfactorily strong and clear signalson all channels. This month's articlewill concentrate on the cables in-volved in such a system. Hardwareand system design will not be cov-ered this month except where theyrelate to cable selection.

TWIN LEAD

Most consumer TV sets offer onlyone type of input -30011 twin lead.This is a carryover from the earlydays of television when the first sim-ple antennas required lead-in wire ofthis impedance. The familiar twinlead helped perpetuate the 3001/standard because of its low cost andease of installation. When clean, dryand carefully installed, the simpletwin lead is still the most efficient(lowest loss) lead in for VHF orUHF on the market-and that in-cludes coax.

As TV technology progressed andwe moved into the UHF channelsand more complex color transmis-sion, loss problems with the simpletwin lead became apparent andspurred the development of im-proved twin leads.

Foam encapsulated types, such asBelden's 8285, cut losses by provid-ing a layer of low -loss cellular plas-tic between the insulated conductorsand the outer insulation-the sur-face exposed to conductive con-taminants.

Later, shielded versions of thefoam encapsulated types, such asBelden's 8290, were developed.Their mylar shield reduces interfer-ence from ignition systems and elec-trical gear. This shield also permitsrunning the 30011 line through ornext to metal, permitting installa-tions not possible with regular twinleads.

COAXIAL CABLE

Paralleling the evolution of the30011 twin lead were the 7511 co-axial cables (Fig. 1) now widelyused in CATV and MATV systems.(The 7511 impedance was chosenbecause coaxial cables are most effi-cient for their size when producedfor this value.) These cables are de-scendants of the cables developedduring World War II for militarycommunications and radar. In fact,MATV and CATV cables are stillso closely allied to their militarycounterparts that they are common-ly identified by their military speci-fication RG/U designations.

It should be remembered, how-ever, that commercial cables for TVdistribution are really RG/U typecables. (It is common in the indus-try to refer to commercial coaxialcables as RG/U type cables, whilereferring to MIL spec varieties asplain RG/U cables.) Commercialcables are modifications of MIL speccables, specifically tailored to meet

Table I-Comparison of MATV Coaxial Cables.

the needs of MATV. Designed pri-marily for low signal loss, the com-mercial cables are less expensivesince they are not designed to meetmilitary specifications more stringentthan those required for commercialuse. Furthermore, MIL spec cablesare only available in solid polyeth-ylene insulation, braided shields,non -contaminating black vinyl jack-ets and to meet one set of electricalcharacteristics.

Quality commercial 59/U typecables, on the other hand, are moresatisfactory for the requirements ofTV signal distribution, feature arange of electrical characteristicsand are available in solid or cellular(foam) polyethylene insulations,braided or film -supported foilshields and have vinyl or polyeth-ylene jackets-in black, white orcolors.

Since the purchaser is not protect-ed by the test documentation of aMIL spec, the quality of a 59/Utype cable (or a 6/U or 11/U typecable) can be subject to variationsdepending upon a manufacturer's in-tegrity. Buying from a manufacturerwith a reputation for quality is thebest assurance of receiving a qualityproduct.

[Editor's Note: When checkingthrough a recent industrial catalog,we noted three types of 59/U cableproduced by one manufacturer un-der different manufacturer type num-

RC

TYPE

CONDUCTOR,GAUGEAND TYPE

INSULATIONAND SHIELD

DIAMETER, INCHES TYPE

ANDDIAMETER,INCHES

WEIGHT PER1,000 FEET,

POUNDS

ATTENUATION,db PER 100 FEET

CH. 13 CH. 83

59a 22. SolidCopperweld

Solid,0.146

Braid

59b 22, SolidCopperweld

Foam,0.146

59c 18, SolidCopper

11d 18, StrandedCopper

Form,0.180

Braid

Duofoil

Solid,0.285

Braid

PVC,0.242

35 5.0 10.9

PVC,0.242

34 4.2 8.6

PVC,0.242

24 3.2 6.8

PVC,0.405

93 3.1 7.1

PE,0.405

2. 3 s.r.5.2

54

Belden 88241, b8221, c8228, d8238, and e8213


bers. One (59a in Table I), listed un-der MIL -C -17A, reportedly had alow -loss, flexible polyethylene innerjacket, covered with a copper -braidshield and a black plastic outer jack-et. It was rated at 7352 impedanceand 21.0pf capacitance, the listedprice being $19.95 for a 500 -ftspool. The other two cables werelisted as special-purpose, low -losscoaxial cable suitable for communityTV cable systems. They reportedlyhave stable electrical characteristics,even with changes in temperatureand frequency. One was rated at7552 impedance and 17.3pf capaci-tance, the listed price being $23.65for a 500 -ft spool. The other (59b inTable I) was rated at 7.552 imped-ance and 16.3pf capacitance, thelisted price being $21.30 for a 500 -ftspool. (The 59e cable in Table I wasnot yet listed in the catalog.) TypesI I /U were also listed in the catalog.One (I Id in Table I) had the samemilitary classification number as thefirst (594). It was rated at 7511 im-pedance and 20.5pf capacitance, thelisted price being $11.85 for a 100 -ft spool (we assume that 500 ft

would cost about $55.00). The other( I le in Table I) was listed (like 59b)as general purpose coaxial cable. Itwas rated at 7551 impedance and17.3pf capacitance, the listed pricebeing $62.50 for a 500 -ft spool. The30051 shielded twin lead (describedearlier in this article) was listed at$47.90 for a 500 -ft roll.]

Electrical loss characteristics ofthe numerous commercial coaxialcables vary widely. For instance, anew 59/U type cable (59c in TableI) with the same outside diameteras MIL -C-17 RG-59B/U (0.242in.), but with a foam core approxi-mately the same size as a 6/U cable,has only about 60 percent of theMIL spec cable's losses. Addition-ally, its losses are only 80 percentof those of the average 59/U typeand about equal to those of the larg-er, 0.332 -in. diameter foam 6/Utype.

COAXIAL CONNECTORS

There is some confusion amongusers over conductor sizes in coaxialcables. For example, Belden manu-factures commercial and govern -

Fig. 1-Comparison of shielded twin lead and coaxial cables.

ment spec 59/U cables in four con-ductor sizes. Most common is the22 -gauge conductor, supplied infoam and solid insulated commercialtypes. This manufacturer also sup-plies a foam commercial type with a20 -gauge conductor and a solid MILspec variety with a 0.023 -in. diam-eter conductor (between 22- and23 -gauge). However, the conductorsize by itself means little to the useras long as his connectors fit. (It isbest to buy hardware that will ac-cept all conductor sizes presentlyproduced, thereby covering all even-tualities.) Most important to theuser are the loss characteristics ofthe cable, conductor size being onlyone determining factor.

When ordering connectors andother hardware, be certain they arecompatible with the cable insofar asthe female part will accept the con-ductor size and the connector bodywill accept the particular cable.

INSULATION AVAILABLEIn general, foam polyethylene in-

sulated cable is preferable to the sol-id type for MATV. The cost is onlyslightly higher, it is lighter, moreflexible. easier to install and offersthe lowest signal losses. The avail-ability of low -loss foam cable hasaccelerated the trend in recent yearstoward the generally superior "on-channel" UHF MATV distributionsystem.

The only advantage of a solidpolyethylene insulated cable, be-sides its slightly lower cost, is itsgreater toughness. It is more crush -resistant and the conductor is lesslikely to be moved off center whenthe cable is bent sharply (which isnot a recommended practice).

TWO SHIELDSIn the past most MATV cables

had braided copper -wire shields,which do a reasonably good job ofprotecting the signal from electricaldisturbances. However, some of thenewer cables feature film supportedfoil shields, which in several waysare superior to braid shields. Theyprovide 100 percent coverage(which no single braid shield cando), and they are thinner, which al-lows more space to be devoted toconductor and insulation-resultingin lower losses. They also block con-taminants, which could pass througha braid shield to attack the insula-tion and possibly alter a cable's elec-

MAY 1970 55

trical characteristics. Foil -film shield-ed cables are also easy to terminate.

TWO JACKETS

Coaxial cables for TV -signal dis-tribution are supplied with jackets ofeither polyethylene or vinyl, vinylbeing the most popular and accept-able for MATV. Compared to poly-ethylene, vinyl is softer, more flex-ible, easier to terminate and flameretardant. It will also accept paintbetter and is supplied by some man-ufacturers in three colors. Polyeth-ylene (available in black only) isseen most often on CATV cableswhere its relative lack of stiffness atlow temperatures and its outstand-ing resistance to sunlight, weather-ing and abrasion from tree branchesis helpful.

Another thing to consider whenpurchasing a coaxial MATV cable iswhether it has been sweep tested bythe manufacturer. Sweep testing is aquality control operation for detect-ing faults that may cause excessivesignal losses on certain channels.

TWIN LEAD OR COAXIAL CABLETheoretically, an MATV cable

system could be made up of either30011 twin lead or 7511 coaxial cable.In practice, the systems are almost100 percent coaxial cable.

This is not to say that twin leadshould never be used. A very simpleMATV system, with four sets oroutlets, could be made up with afour -set coupler and carefully routedtwin lead. In a location where signalstrength is adequate and where in-terference is minimal, this systemwould be inexpensive and service-able. Such a system could be in-stalled in a home in the suburbs.

For a slight increase in cost, sucha system could be improved with theuse of a shielded twin lead to elim-inate interference and secondary sig-nal pickup. The shielding also per-mits routing near conductive objectsor installation in conduit. In areaswhere the signal strength is weak, anantenna -mounted amplifier, attic orbasement amplifier -coupler could beadded to boost signal levels and per-mit the use of additional couplersand more outlets.

[Editor's Note: Shielded twin leadgenerally has less signal loss than thecoax and there are fewer problemsof ghosts resulting from impedancemismatching.]

COAXIAL CABLE OFFERSVERSATILITY

Although a shielded twin lead sys-tem, like the one just described, cando an excellent job, there are practi-cal and economic limits restrictingits use in an MATV system. Shield-ed twin -lead is more expensive andharder to route than plain twin -leador 59/U type coaxial cable. Itdoesn't take too many feet beforecoaxial cable and matching trans-formers are less expensive than ashielded twin -lead system.

For all but small, uncomplicatedsystems, coaxial cable is the mostpractical answer. It is the lowestcost form of shielded TV lead. Han-dling, routing and pulling in conduitare easy because of its round con-figuration, flexibility in all directionsand lack of stiffness or bulkiness (atleast in the 59/U size). Addition-ally, it is easier and faster to installand terminate than a shielded twinlead.

But most important, a wide va-riety of hardware is available forcoax -amplifiers, splitters, mixers,multiplexers, taps, attenuators, fil-ters, connectors, single -channel an-tennas, converters, etc. The avail-ability of such hardware makes com-plex signal processing and balancingpossible for the larger MATV instal-lations carrying numerous channels.System design can be approachedwith confidence because electricalcharacteristics can be accurately de-termined. Furthermore, the systemscan be quickly installed.

Because of these advantages, thebalance of the article will deal ex-clusively with systems containing co-axial cable.

SELLING THE SYSTEM CONCEPT

MATV distribution systems arebecoming as important to modernbuildings as electric -power distribu-tion systems; and, therefore, theyshould be included right from thestart in the electrical planning.Equipment, riser and tap locationsshould be determined early andspace provided. MATV dealers andcontractors must get to know archi-tects and builders and educate themin the potential of MATV systems.

GOING -ON CHANNEL

The trend in MATV is towardon -channel systems in which the

TV CHANNELS TABLE

ChannelNo.

Frey.

RangeChannel

No.Freq.Range

VHF23456

54 6060 6666 7276-8282.88

UHF414243444546

632 638638-644644 650650 656656 662662 668

98 rno 88 108 47 668.6747 174.180 48 674 6808 180.186 49 680 6869 186 192 50 686 692

10 192 198 51 692 69811 198 204 52 698 70412 204 210 SA 704 71073 210-716 54 710 716

55 716-722UHF 56 722 728

14 470 476 57 728 73415 4764-82 58 734 74016 482-488 59 740-74617 488 494 60 746 75218 494 500 61 752 75819 500 506 62 758 76420 506512 63 764 77021 512-578 64 770.77622 518 524 65 776 78223 524 530 66 78278824 530 536 67 788 79425 536-542 68 794 80026 542-548 69 800-80627 548554 70 806-81228 554 560 71 812-81829 560 566 72 818-82430 566.572 73 824-83031 572-578 74 830 83632 578 584 75 83684233 584 590 76 842-84834 590 596 77 848 85435 596-602 78 854.96036 602-608 79 860-86637 608-614 60 866-87238 614-620 71 872 87839 620-626 82 878 88440 626.632 83 884 890

Table II-Frequencies Assigned VHF and UHFTelevision Channels.

UHF channel signals are not con-verted to VHF but are distributedand fed to the sets at their trans-mitted frequencies. (Table II liststhe frequencies assigned the VHFand UHF television channels.) Theavailability of lower -loss cables andall -channel hardware, plus the pre-dominance of all -channel TV sets,makes the conversion from UHF toVHF unnecessary. An on -channelsystem is obsolescence proof sinceit can easily be expanded as newchannels come on the air. The costof converters is eliminated; and ad-ditionally, sound traps to prevent in-terference between adjacent VHFchannels, when UHF channels areconverted to VHF, are unnecessary.

SELECTING THE CABLELoss characteristics are the major

consideration when determining thetype of coaxial cable to be used. Ev-ery cable type has its own character-istic curve, which details losses indecibels (dB) per 100 ft in relationto frequency. (A sample set of char-acteristic curves is shown in TableIII.)

Generally, the larger the cable thelower the losses. Foam polyethyleneinsulated types offer lower lossesthan similarly sized solid polyeth-ylene insulated types. But loss char-


11

10

so ua

Table III-Loss Characteristics of MATV Coaxial Cables.

acteristics can vary considerablyeven among foam types of the samesize.

Signal losses also increase as theirfrequency increases, roughly in di-rect proportion to the square rootof the frequency. As an example,cable losses at 400MHz are roughly20/30ths (or ) the losses at 900MHz.

Cable losses increase directly withlength. A cable section twice as longas another of the same type hastwice the decibel loss. When cal-culating cable losses, the decibelsare simply added. If the run is 400ft and the cable has a loss charac-teristic of 7dB per 100 ft at thefrequency in question, the total losswill be 28dB.

Always be sure to calculate lossesat the frequencies for Channel 13and Channel 83 (where losses arehighest for their particular bands)even though no transmitters may bebroadcasting in your area on thesehigher channels. In this way, provi-sion is made for new stations.

ASSUME 59/U TYPE CABLEWhen making calculations to de-

termine what cables to specify foran MATV distribution system, itis best to assume that a 59/U typecable of the most efficient design willbe used, unless it is known from pre-vious experience that a larger size

200 300 400 500 600 .700

FREQUENCY. megacycles

cable will be necessary. For mostjobs an ultra low loss 59/U typecable will be adequate.

Unlike 60Hz electrical wiring,the load, or number of TV sets tobe hooked on the line, has no effecton the size cable needed. It does notmake any difference whether thelength is feeding one set at the endof a system or is the main trunk forhundreds of sets.

The use of larger, more efficient6/U and 11/U type cables is seldomnecessary except for systems withvery long runs. Their cost is high-an 11/U type cable lists at aboutthree times the price of a similarlyconstructed 59/U type cable. Fur-thermore, they are stiff, bulky, hard-er to run and require larger, moreexpensive conduits.

On many smaller MATV systems,the designer quickly realizes that ca-ble losses can be small compared tothe losses in certain hardware. Evenso, it is still wise to choose as effi-cient a cable as possible to providemaximum capacity for future exten-sions. Also, the amplifier specifiedcan be of minimum capacity, andbalancing will be easier since differ-ences in signal levels at the taps willtend to be minimized.

CALCULATE CONSERVATIVELY

When calculating losses, alwaysfigure that the TV set requires 1000

1.800 900

to 2000pv at 7511 to operate, andthen work your way back from thefarthest set to the antenna. ModernTV sets can operate with signal lev-els as low as 150tiv, but this valueshould not be used in your calcula-tions. This provides a safety factorfor possible TV set and distributionsystem deterioration through age.Under certain environmental condi-tions, such as high temperatures, co-axial loss levels can exceed the nom-inal values used for calculations. Bycalculating with a base of 1000 to2000py at the set, any such systemdegradation will not be noticed.

PURCHASE WISELY

When purchasing cable, be sureto obtain a type that is primarilydesigned for MATV systems, or forCATV systems as an alternative.CATV cables, with polyethylenejackets, are designed for outdoor useand are inherently stiffer and harderto terminate.

Be careful not to accidentally or-der an MIL spec cable since you willbe paying for documentation of teststhat do not apply to the characteris-tics that are important in an MATVsystem.

"Precision video" cables shouldalso be avoided since they are in-tended for entirely different appli-cations. Again, the cost would beway out of line as far as MATV is

MAY 1970 57

concerned, and the quality would beunnecessary.

INSTALLING THE CABLECoaxial cable, unlike unshielded

twin lead, can be routed either in orout of conduit. Be sure to check lo-cal codes concerning conduit re-quirements. In any case, never installcoaxial cable in the same racewayor conduit as power cable.

Always remove the cable from aspool by rotating the spool ratherthan by taking it over the end ofthe spool. When reeling over theend, one revolution of twist is putinto the cable for every turn takenoff the spool. This will cause thecable to kink (which can damageit) and make pulling the cable moredifficult.

When pulling a braid -shielded ca-ble into a conduit, always tie thebraid, rather than the center con-ductor, to the pulling device. On theother hand, when pulling foil -shield-ed cables, the drain wires should betied to the center conductor. Specialcaution should be exercised whenpulling by the center conductor inorder to avoid stretching it. If neces-sary, use a pulling lubricant to easethe job. Make sure that the label onthe lubricant states that it can beused with the cable jacketing mate-rial.

If possible, before pulling a cableduring the winter months, warm thecable to room temperature. Thevinyl jackets common to MATV ca-bles tend to stiffen when cold, whichmakes the cables more difficult topull and can result in damage to thejacket.

Never jerk the cable or permit itto kink. Do not allow it to be scuffed,nicked or cut so that water, moistureor contaminants can get beneath thejacket and have a chance to attackthe insulation and shield.

The minimum bend radius for anMATV cable varies according towhether it is being pulled into con-duit or stapled to a wall. A 59/Utype cable should not be pulledthrough a conduit containing a bendof less than 5 in. radius. If the cableis being stapled to a wall where noflexing or pulling is done, the radiuscan be reduced to 10 times the cablediameter.

If the cable does not have to berun through a conduit, it is easierto just staple it to a wall or run it

through clips. A staple that fits thecable with a round crown should beused, taking care without crushingit. The staple should never constrictthe cable since that might cause sig-nal reflection problems.

Do not be too precise when spac-ing staples. They should be placedrandomly rather than at measuredintervals. Standing -wave reflectionsmay result on one of the TV chan-nels if staples are installed at mea-sured intervals that happen to cor-respond to the wavelength of the sig-nal received.

Do not run the cable through anyareas where the temperature maybecome greater than 180°F. Poly-ethylene insulation will soften atthis temperature, with the conductorpossibly shifting off center. Thiswould result in an impedancechange in the cable and possibly de-grade the picture.

Generally, if the MATV system isto be installed in a building locatedwithin 15 miles of a transmitter, usecoaxial cable right up to the TV setbefore converting over to 3001Z twinlead with a matching transformer.[Editor's Note: Some of the more re-cent TV sets have 751! tuners andthe coaxial cable can then be pluggeddirectly into the set without usinga matching transformer.] Signalstrength from a nearby transmittercan be so high that a short length ofunshielded lead can pick up a ghost -producing signal.

TERMINATING COAXIAL LINESAlways remember that the end of

a coaxial line must be terminatedwith its characteristic impedance-either in a specially designed termi-nation, a tap or other device thatproduces the same effect. A coaxialcable cannot be just cut off and lefthanging because the signal will thenbounce back down the cable andcreate ghost reflections in all of thesets.

It is a good idea to wear safetyglasses when making up connectors.Occasionally the end of a conductormust be snipped off and the littlefragments of wire can be extremelydangerous. The center conductor ofan MATV cable is frequently cop-per -covered steel rather than solidcopper, and the snipped fragmentusually flies off like a bullet. Even a"soft copper" conductor fragmentcan result in the loss of an eye.


50 FT

- -

- _

Fig. 1 shows depthfnder pulse being transmittedand "reflected" hack from the bottom to provide a depthindication. (Courtesy Heath Co.)

One of the biggest booms in thecountry today is pleasure boating.Everyone is taking to the woods withtents, trailers, campers and boats tofish their favorite area or enjoy aweekend in the sun. And right alongwith today's sportsman goes his de-sire to communicate. Where he usedto take a portable radio, he now car-ries a compact battery operated TV.In fact, many sportsmen today con-sider units such as marine two-wayradio and direction finders essential

Electronic Depth -FindersIf your service shop has room for additionalbusiness, you might consider marine electronicsales and service including the popular depth -

finder or depth -sounder ur its which are designedto operate on almost any size boat.

to their boating activities whetherfor fun or fishing.

Another boon to boating whichhas gained considerable popularity isthe depth -sounder or fish -finder typeof equipment. Actually, these are thesame instrument in most cases astheir operating characteristics pro-vide for an "echo" or reflected sig-nal any time the transmitted signalhits a sufficiently solid underwaterobject.

The instrument operates some-

TRANSMITTEDPULSE

0 005 01 015

-tPULSE REACHEDBOTTOM AT 0104

TRANSMITTED2ND PULSE

PULSEECHO

ARRIVAL

02 025 03 C35 04 045 05

0208

TIME IN SECONDS

0418

Fig. 2 illustrates the time lapse between the transmitted and received signals which determinethe distance in feet from the transducer to the reflecting object. (Courtesy Heath Co.)

what like a sonar set which, in gen-eral terms, could be considered asan underwater radar. It operates onthe principle that sound waves inwater travel at approximately 4800ft per second. This speed will varydepending on the salt content andthe temperature of the water. Sonarequipment such as used on ocean-going fishing boats are calibrated orcompensated for the water tempera-ture or thermal layers at variousdepths. However, most of the instru-ments normally found on pleasurecraft are not concerned with thesefactors as operation is limited to rel-atively shallow fresh water areas.

The depth -finder or fish -finder in-strument uses a "transducer" as itstransmitting and receiving antenna.It is normally the most delicate partof the system and should be handledwith care. The transmitter puts outa signal consisting of pulses at a fre-quency of 200kHz, which are trans-mitted into the water through a spe-cial element in the transducer. Thetransducer acts much like a radiospeaker except that, instead of mov-ing air, it moves water. The pulsesare actually directed into a narrowbeam as shown in Fig. 1. The pulsesare sent out and reflected to bepicked up by the transducer. Thetime it takes for the pulse to go outand then return is measured andcalibrated on the instrument's meterin terms of feet.

We indicated that sound in watertravels at approximately 4800ft persecond or .000208 seconds per foot.

MAY 197059

-T-

1-10---

INCIAIAT IC 01, 1,[

I14 SPOT Ttig.000[1. 11.1.20

..................

Fig. 3-Schematic Diagram of the Heath MI -29. (Courtesy Heath Co.)

Supposing then, that we are operat-ing a depth -finder on a lake over aspot 50ft deep. The time for thepulse to go to the bottom will be 50times .000208 or .0104 seconds(104 milliseconds). Since the signalmust also reflect back to the trans-ducer, the round trip time is 2 times.0104 or .0208 seconds. The dia-gram in Fig. 2 shows how this wouldappear if we could see the pulse goout and return.

TYPES OF "DEPTH -FINDERS"The accompanying photos show

several types of depth -finding or fish -finding instruments. The RaytheonModel DE -732 Fathometer is a sol-id-state depth -sounder designed tooperate from 12vdc. Since it is tran-sistorized, the current requirement islow, approximately 200ma, and thismeans it can be operated from aboat's 12 -volt electrical system orfrom a 12 -volt lantern battery. Theunit is housed in the indicator as-sembly shown with the transducerand power plugs at the rear.

The Sonar Model D120 DepthIndicator is a tube operated unit for12 or 6vdc and provides readings to250ft. This unit uses a flashing typeof indicator and can be used for lo-cating fish, wrecks and other objects.The instrument has two scales, anouter scale for depths to 125ft andan inner scale for depths to 250 ft.

The second revolution of the indi-cator is provided for the 125 to 250ft depths. The D120 operates froma heavy-duty power supply and asynchronous A 115Hz vi-brator determines the motor speed.The circuitry consists of a 200kHzpower oscillator, a wideband ampli-fier and a magnetically controlledkeying amplifier.

The transducer is a ceramic ele-ment housed in a machined bronzecasting and encapsulated. It also hasprovision for either through -the -hulltype mounting, or it can be mountedexternally on the transom. The in-dicator includes plug-in jacks for thedc power source and cabling to thetransducer. Since this is a tube op-erated instrument, the power re-quirements are somewhat higherthan those of the solid-state units,but still nominal for most installa-tions. It requires approximately 23/1amps for 12 -volt operation and 5.5amps for 6vdc use. The instrumentweighs 61/2 lb.

Allied Radio's new Model KG -711 Ultrasonic Depth Meter is aKnight -Kit instrument, which is de-signed to operate on eight self-con-tained flashlight ("C" size) batteriesor from the boat's electrical system.The unit has a gimbal mountingbracket for the meter and comeswith a transducer mounting assem-bly. Specifications indicate operation

to 200ft on hard bottom and 100fton soft bottom.

The Heath MI -29 Fish -Spotter isa transistorized unit which will readdepths to two scales. It iscompletely portable as it operatesfrom two self-contained 6vdc lanternbatteries and comes with a suctioncup transducer mounting bracket.The carrying case is waterproof andalso floats if accidentally droppedoverboard. Storage space is providedfor the transducer and cable in thecase. This instrument has nine tran-sistors and five diodes to produce a200kHz pulse frequency. The powerrequired of the lantern batteries isbetween 80-100ma for a nominalbattery life of 80 hours.

CIRCUIT DESCRIPTION-TRANSMITTER

The schematic diagram of theHeath MI -29 is shown in Fig. 3 toillustrate the operation of depth -finder or fish -finder instrument. Thecircuit can be divided into two parts,transmitter and receiver. A brief ex-planation of how the circuits operatewill help you do a more efficient ser-vice job.

The rotor disc assembly is rotatedby the motor and has a permanentmagnet mounted on it. Each timethe magnet passes the pickup coil,L4, it induces a current in the coil.This current flows through L4 and


Raytheon DE -732 fathometer depth -sounder isa transistorized ul t for reading. (Courtesy Ray-theon Co.)

The Sonar Model C-20 Depth Indicator is tubeoperated for use on 6 or 12 do and providesreadings to 2501: on two scales. (Courtesy So-nar Radio Corp.!

The Heath Mcdrt MI -29 Fish Spatter is transis-torized and :cmpletely fcr tube using self-contained larte-n batteries for operation indepths to 2(11f: (Courtesy Heath Co.)

produces a pulse which is appliedthrough R31 and R29 to the base ofthe oscillator transistor, Q9. Thepulse causes Q9 to conduct andwhen it conducts, the oscillator op-erates at 200kHz. This signal is thencoupled through C13 to a small por-tion of the oscillator coil, L3. Thissignal is stepped up and coupledback through C15 to the base of Q9,which completes the feedback loopand causes oscillation.

The oscillator operating frequen-cy is determined by the tuned cir-cuit of L3 and C12. The control,R31, adjusts the amplitude and dur-ation of the oscillator trigger pulse,which subsequently determines theduration of the transmit signal. The200kHz signal is coupled throughC14 to the transmitter output, Q8,where it is amplified and coupled tothe output coil, L2. Here the voltageis stepped up to approximately 200volts (peak -to -peak) and coupled tothe transducer where it is convertedto a mechanical, ultrasonic signal.Since the output signal occurs onlywhen the magnet rotates past L4,the transducer is free to receive re-flected signals through the rest ofthe rotor -disc's arc.

CIRCUIT DESCRIPTION-RECEIVER

The receiver circuits operate con-tinuously whenever the MI -29 isturned on. The transmitted signal isreflected from the bottom or fromsome other submerged object. Thisreflected signal is picked up by thetransducer and changed back into anelectrical signal. It is coupled throughCI to the base of Q1 where it is am-plified and coupled to the interstagetransformer, Ti.

From T1, the signal is coupledthrough C3 to the base of Q2 forfurther amplification. The gain oftransistor Q2 is controlled by theSENSITIVITY control, R8, whichin turn, varies the amplitude of thesignal to the interstage transformer,T2. The signal from T2 is coupleddirectly to the base of 03. TransistorQ3 is connected in a detector cir-cuit with R13 and C5. R11 and D1bias Q3 so it will pass only the posi-tive portion of the applied signal.The detected signal at the collectorof Q3 is in the form of a squarewave pulse. This pulse is then cou-pled through R13 to the base of Q4which is normally biased off. It isbiased on by the pulse at a level set

by the NOISE REJECTION con-trol, R15.

When transistor Q4 conducts, C6,which is connected to the collectorof Q4 begins to charge. When thecharge on C6 reaches approximately1.2vdc, transistors Q6 and Q7, whichare normally biased off, will con-duct. The output signal from Q6and Q7 is then coupled through theoutput transformer, T3, where it isstepped up to sufficiently fire theneon lamp. Noise pulses, eventhough high in amplitude, are gener-ally too short in duration to chargeC6 and bias Q6 and Q7 into con-duction. This insures that the neonlamp will not flash and indicate falsereadings. The charging time of C6can be controlled by changing theresistance of the NOISE REJECTcontrol, R15. At the end of the sig-nal pulse, 03 is again cut off and itscollector voltage increases. This in-creases the bias voltage of 05 andcauses it to conduct, which then dis-charges C6. Diodes D3 and D4 inthe secondary of T3 keep the nega-tive voltage produced by the collaps-ing magnetic field of T3 (at the endof a pulse) from firing the neonlamp.

INSTALLATIONThe installation of electronic

depth -finder equipment varies slight-ly between the various manufacturedtypes, but all require mounting atransducer and control or indicatingunit. The different mounting config-urations normally concern only theinstallation of the transducer.

The Raytheon DE -732 has threetransducers available: a through -hullmounting type, transom mountedtype and one to mount in sailboatfore -foot. The Sonar Model D -120Mallows for two mounting configura-tions: either through -hull or tran-som. The Heath MI -29 is a portableinstrument and designed to bemoved if necessary from boat toboat so it is the simplest of all toinstall. It comes with a transducermounting bracket attached to a suc-tion cup unit for attachment to thetransom or hull of any boat. TheHeath Company also manufacturesa Model MI -19 Depth -Sounder,which can be purchased for through-hull or transom operation in a fixedinstallation. The difference betweenthe MI -19 and MI -29 is that theMI -29 is made to be completelyportable for the fisherman and so

MAY 1 J7061

has internal batteries and a movabletransducer assembly.

The diagrams in Fig. 4 and Fig. 5show the two common types of fixedtransducer mountings. The trans-ducer cable to the indicator in allcases is a fixed length and cannotbe changed regardless of how longit is. When the installation isplanned, it should be made so thatthe cable will reach. Any extra cablecan be rolled up and taped out ofthe way. As shown in the diagrams,the transducer should be mountedabove the level of the bottom of thekeel. This will afford some degree ofprotection for the transducer face. Athrough -hull installation should bemade with the transducer locatedslightly forward of amidships. Itshould in all cases be mounted so

-1-445iNdo p00

20.120f(30,0 190 J1: sE

DEFMMETERTo 0EL 0-111 153

'110

. BO

Iti° 50

140

160

,/10.

The Knight Model KG -711 Ultrasonic Depth Me-ter kit operates on either eight self-contained"C" batteries or from the boat's electrical sys-tem for depth indications to 200ft on hard bot-tom. (Courtesy Allied Radio Corp.)

that its face is parallel to the waterline. Through -hull installationsshould be located away from anyother through -hull opening whichcould cause turbulence around thetransducer. Be sure to pick a mount-ing spot which will allow room in-

side the boat for securing the trans-ducer mounting hardware and forrouting the cable. The transducercable should be routed away fromthe boat's electrical system if pos-sible as it can pick up noise.

If noise does show up, it should

CABLE TO DEPTH SOUND

HEX NUT.

LL

13/16'- DIAMETERHOLE THROUGH HULL

OUTER FAIRING BLOCK,(Place sealing compoundbetween block and hu..1)

TRANSDUCER. Place mailingcompound between T.ndoccirand FAir.ng block.

CAUTION' NO PAINT oa SEALINGCOMPOL.IND ON FACE OF TRANSDUCER.

CANVAS WASHER(Coat generouly wtta

sealing compound(

INNER FAIRING BLOCKIPlac ealum cornpourdbetween block and roll)

Fig. 4-Typical through -hull transducer installation shows tia of fairing blocks to provide parallelmounting. (Courtesy Raytheon)

TRANSOM OF BOAT

TRANSDUCER TRANSDUCERMOUNT

NOTE: Fill snare between transducerand transom with epoxy or caulkingcompound after metallation Bottom ofboat and transducer face must form asmooth unbroken mirface fore and aft.

STRAIGHT EDGE (RULER, ETC.)

(TRANSDUCER MAY BE INSTALLEDEITHER SIDE OF TRANSOM)

STERN VIEW

CABLE

CABLECLAMP

rig. D-transom mournea transaucer is iocatea on keel center line ana piacea inhn who OUTIOFTI of [mat sideways drill It11IIIWISE. 1l..111.1 le y yu u

62ELECTRONIC TECHNICIAN/ DEALER

be handled much the same as auto-mobile noise in a two-way radio sys-tem. Bond all electrical grounds andmetal -to -metal contacts. Make goodground connections and check allignition fittings.

If the transducer installation is tobe a transom mounted system, besure that' the transducer is securedparallel to the water line. On boatswith one engine, place the trans-ducer mounting at least fifteen inch-es to one side of the centerline. Ifthe boat has two engines, the trans-ducer should be placed exactly onthe centerline.

When mounting the indicatorunit, it is best to place it where it isout of the glare of the sun eventhough some of the meter units areshielded. The indicator mountingbrackets should always be set forthe best viewing angle. Power con-nection for most of the depth -findersis simply a matter of connecting twoleads to the 12 or 6vdc source. Apower cable is provided with all ofthe instruments discussed in this ar-ticle.

MAINTENANCE

The amount of maintenance re-quired on the instruments outlined inthis article is relatively small. Nor-mally, it will be limited to an occa-sional indicator lamp replacementand slip -ring cleaning. Replacementof the indicator lamp in the Ray-theon DE -732 is accomplished bysimply removing the rotor assemblyand inserting the new lamp in thefahnstock clips. The rotor is acces-sible by removing a couple of screwson the back of the indicator andthree on the printed circuit board.The only other maintenance on thisinstrument is to be sure that themagnet is in line with the center ofthe rotor for maximum pulse ampli-tude.

The Sonar Model D -120M re-quires periodic cleaning of the com-mutator rings. The rotating indicatorarm is accessible after removing thefour corner screws in the dial hood.The rotor arm is fastened to themotor shaft with a set screw. Loosenthe set screw, remove the rotor armand carefully clean the arm commu-tator ring. The indicator lamp, whichis neon, is held in place on the in-dicator arm by a spring clip. Thelamp electrodes are pressed intosmall spring clips. The replacement

continued on page 91

TEST LAB REPORT

EICO Model 240Solid -State FET-VOM

Here's how to have the latest

in a solid-state voltmeter and still

save a few bucks

It takes a fast-moving technicianwith a fairly hefty budget to keephis shop equipped with the manynew test equipment items introducedin the past several years. Even thatold 'work -horse' of test equipment,the vacuum tube voltmeter, has beenupdated with solid-state circuitryand is now called by the initialsEVM, SSVM or FET-VOM. Oneway for the technician to make hisequipment buying dollars stretch alittle farther is through the assemblyin his own shop of one of the kitsnow being offered by several manu-facturers.

We recently assembled EICO'sModel 240 Solid -State FET-VOMin the ET/D laboratory at a savingsof around $20 from the factorywired price. For a few hours of workand the use of a few shop tools, wewound up with a modern, totallytransistorized FET-VOM.

The Model 240 features an acpower supply for bench work and abattery supply for field use. Itssemiconductor circuitry providesflexibility for not only the servicingof vacuum -tube equipment, but alow 1 volt dc full scale for semi-conductor circuit testing. Voltagesas low as .02 volt dc are easily andaccurately read with good indicationavailable down as low as .01 volt.Direct readings may be made up to1000 volts dc and with the additionof an HVP probe (not supplied withthe kit) readings can be extended to30,000 volts dc.

The seven ac ranges cover thecomplete gamut of voltage measure-ments from 1 volt rms (full scale)

to 1000 volts rms (full scale). Themeter scales are calibrated in bothrms and peak -to -peak to enable ac-curate conversions. Covering thefrequency range from 25Hz to over2MHz, you can perform most re-quired ac measurements with the acportion of the 240.

Seven ohmmeter ranges are avail-able to read up to 1000 megohms.A low voltage supply is used in theohmmeter section to avoid accident-al damage to semiconductors in theequipment under test. However, thisvoltage is high enough for use intesting both diodes and transistors.

An FET-input semiconductor,differential amplifier, tight voltageregulation and close -tolerance re-sistors seem to provide stability and

ail1=111111111111110k

111111=1111111C:I=ErMMIKalrite NU MOM AIJJ

EICO Model 240 solid-state FET-TVM


MAY 197063

accuracy in all ranges. No warm-upis required with the 240 and theFET input circuit is protected bysemiconductor circuitry.

HOW THE FET CIRCUIT WORKSThe high input impedance fea-

ture of the field effect transistor(FET) used in the 240 allows fortesting of the low voltages of solid-state circuits.

The FET circuit is shown in basicform in Figure 1. It consists of adifferential amplifier formed by npnsilicon transistors Q2 and 03. Ifboth transistors are matched and thesame base bias is applied to each,there will be the same voltage devel-oped at the emitters of both tran-sistors. In this case, the meter willindicate zero. Note that the basecurrent of 03 is kept constant bythe voltage divider consisting ofR20, R21 and the resistance reflect-ed at the base at Q3. Transistor Q2,however, uses a field-effect transistoras a voltage -variable resistor. In itsbase bias network, it forms a voltagedivider in conjunction with R17.

When a dc voltage is applied tothe gate of the FET, its channel re-sistance, acting as the base bias re-sistor for Q2, varies. This affects thebase bias of Q2. A change in thebase bias of a transistor produces achange in the current flowingthrough it. This, in turn, causes thevoltage drop across R18 to varywith the gate voltage of the FET.The meter will then indicate thevoltage difference between the emit-ters of fixed Q3 and variable Q2.

Because too great a voltage swingat the gate of the FET can cause itsjunction to burn out, some form ofvoltage limiting is required at thegate. This is the function of silicontransistors Q4 and 05. Note thatthe bases of these transistors are notused and they act as high -qualitytemperature compensated zener di-odes. When the voltage at the gateof the FET exceeds the base -emitterbreakdown voltage of the transistors(about 9 volts) in either direction,the transistors clamp the gate volt-age to 9 volts.

The remainder of the circuit inthe 240 is conventional VOM. Theresistor divider networks are calcu-lated to permit the proper voltages

C4

RI6INPUT

Q4

01

Q2

MI

RI7 Z RI8

R20

3

R19 R2I

Fig. 1-Basic schematic of FET circuit in Model 240 FET-VOM.

to be fed to the FET for the variousranges. A pair of silicon diodes in apeak -to -peak double circuit act asrectifiers to convert input ac voltagesto the required dc to operate theFET.

Assembly of the 240 kit is fairlyeasy, instructions are quite thorough,and if you follow them carefully andrecheck your work at each step, youshould end up with a professionallooking and working FET-VOM.

We would suggest to the manu-facturer, though, that one small linebe added to the assembly manualabout removing the meter shunt wireduring assembly. Even someone withexperience in assembling electronicequipment could forget to removethis shunt before trying to operatethe meter. We know. We forgot.

SPECIFICATIONS

DC Voltmeter: Range: 0 to 1, 3,10, 30, 100, 300, 1000 volts either+ or -; input resistance: 11 meg-ohms; accuracy: ± 3%; range canbe extended to 30,000 volts using anHVP.AC Voltmeter: Range: RMS-0 to1, 3, 10, 30, 100, 300, 1000 volts;P -P 0 to 2.8, 8.5, 28, 280, 850,2800 volts; input impedance: 1

megohm; accuracy: ± 5% of fullscale (with sine -wave input signal);frequency response: ± 1dB from 25Hz to 2MHz. Can be extended to250MHz using RF probe.Ohmmeter: 0.2 ohm to 1000 meg-ohms in seven ranges.Meter: 41/2in., 200µa movement.Power Supply: transformer isolated,silicon rectifier, zener regulated, 1.5volt battery for ohmmeter function,three 9 -volt transistor radio batteriesfor portable power. Overall dimen-sions: 81/2 in. high, 53/4 in. wide, 5in.deep, weighs 61b. Kit price, $59.95;wired, $79.95.


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Electronic Circuit DesignHandbook Motorola Color TV Service Manual Electric Motor Test & Repair

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GOLOR TVTROUBLE

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Here's a complete guideto color TV troublesand solutions, arrangedby make and model, alow-cost, all -in -one ref-erence handbook everyTV service technicianshould own. The infor-mation it contains mayeasily save you hoursof time repairing a"tough -dog" color TV.Included are detailsconcerning repetitivetroubles, field -factory

changes, new and unusual circuits and de-scriptions of how they work, special adjust-ment procedures and other such pertinent ser-vice information. The content is arranged bybrand names, covering every major make ofcolor TV receiver produced in the past severalyears. Models and chassis covered are arrangedin alpha -numerical order. 176-pps. Hardbound.List Price $6.95 Order No. 519

Audio Systems Handbook

Complete reference andguide to audio systemdesign, encompassinghome entertainment,commercial sound andstudio installations.Chapter 1, coveringamplifiers and amplifi-cation, explains db andimpedances, level limi-tations, insertion gain,plus a host of otherbasics necessary forpractical system design.The author goes to

great lengths to impart an understanding ofthese vital ingredients as they apply to over-all operation. The same may be said of thetreatment in succeeding Chapters on equaliz-ers, mixers, filters, distribution systems, pro-gram sources, commercial systems, studios,and loudspeaker systems. 192 pps., 125 illus.Hardbound.List Price 57.95 Order No. 494

104 Easy Transistor ProjectsYou Can Build

How would you like tohave a high -gain tele-phone pickup, a wire-less mike, an electricmegaphone, a CB re-ceiver, light dimmer,fence charger, or anyone of 104 such usefuldevices? You can buildthem yourself, at verylittle cost, and have alot of fun in the proc-ess. What's more,you're bound to learn alot about transistor cir-

cuits i including FETs and SCRs). A completeschematic diagram is included for each device.along with a parts list, plus a brief descrip-tion of its operation and application, and no-tations concerning any critical points. All ofthe devices have practical application in thehome, on the repair bench, in the ham shack,on your car, boat, airplane, etc. 224 pps.Hardbound.List Price $6.95 Order No. 462

Handbook of SemiconductorCircuits

Contains 124 examplesof standard transistorcircuits, complete withoperational data foramplifiers, oscillators,logic and switching cir-cuits, power supplies,and various nonlinearcircuits. The broadrange of circuits includ-ed were selected on thebasis of application andpracticality. A designphilosophy section is

included with each group of circuits, therebyproviding a basis for understanding circuitsother than those selected as examples. This isnot a handbook of "preferred" circuits, butrather a collection of practical circuits whichhave wide application and exemplifying goodengineering design. Each circuit descriptionincludes data concerning any unique design oroperational data, along with schematic dia-grams. Hundreds of illustrations and diagrams.448 pps., 6" x 9". Hardbound.List Price $8.95 Order No. G-30

Digital Computer Theory

DIGITAL

COMPUTER

THEORY

Whether you are atechnician or engineerwho needs comprehen-sive knowledge of com-puter operation, or sim-ply a hobbyist with apassing interest in thesubject, this outstand-ing text is for you. Inthe first section you areacquainted with basiccomputer technology,including computercodes and language pro-gramming. The second

section presents a detailed study of moderncomputer logic circuits, such as AND, OR.NAND, and NOR gates. In addition, thoroughexplanations of basic circuit blocks are dis-cussed-bistable, monostable, and astable mul-tivibrators, Schmitt trigger circuits, etc. Final-ly, the third section covers memory, control,arithmetic, and input-output units. 320 pps.Hardbound.List Price $7.95 Order No. 276

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-leaps, 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 various 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. 272pps., over 300 illus., 26 Chapters.List Price $7.95 Order No. 493

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69

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COLOR FAX

continued from page 40

to position body of resistor in a location at least two tothree inches away from any of the remote control motors(i.e., color, tint, volume). This action may involve a simplerelocation of the terminal board further rearward on theTMA bracket. Resistor R95 is accessible without pullingthe TMA or chassis.

It is recommended that all service technicians carrysleeve "spaghetti" and small, isolated -type terminal boardswhen making in -home service calls on referenced receivers.

SYLVANIAColor TV-Testing the Focus Rectifier

One problem confronting the TV technician is finding amethod to check color TV focus rectifiers either in thehome or shop.

Normally, the technician usually checks the raster scanline sharpness while adjusting the focus to determine therectifier's merit, then moves on to the next decision.

Obvious failure usually generates a very pungent odor,smelling of burned selenium, or show scorched spots alongthe cell's outer covering.

Focus rectifiers, like many other type electrical com-ponents, can look normal and be right on the money in itscapability to generate the correct focus anode voltage.However, there are times when a focus rectifier may seemnormal, but when used as a replacement part, proves nobetter than the defective one, producing the original symp-tom.

LIFT PLATECAP OFF H.O.T.

TO n VOLTAGE RECTIFIER

=El

FOCUS RECT.

T40HORIZONTALOUTPUT

1 TRANSFORMER

4.7ME0

100K OHM

66MEGTEST RESISTOR

V.T.V. M.OR

VOM.

TO FOCUS ANODE CRT.

Circuit tests for a focus rectifier are somewhat differentthan a power diode or signal diode due to the high voltagerequired to forward bias the cells into conduction. An in -circuit testing procedure other than the visual CRT in-spection is needed.

There is a focus rectifier testing circuit built into everycolor TV chassis, whereby the rectifier's merit can be de-termined. It means simply, to use the circuit formed by thehorizontal transformer, focus rectifier and voltage dividerin the following manner. (1) Remove the horizontal out-put tube from socket. (2) Shunt a 100K (one to twowatts) across the divider to ground (4.7M and 66M ohmresistors). (3) Place a voltmeter across the 100K resistor(use 500vdc scale as a protective measure). (4) Turn onthe TV power. (5) Note the voltage drop across the 100Kresistor. (6) Move the voltmeter probe to the rectifier'sother end (anode). Note the voltage. (7) The focus recti-fier's merit factor should be over 60 percent as figured inthe following way:E 100K =E anode F merit X 100 = F merit percent

The rectifier with the highest merit factors are the best.. . . for more details circle 122 on Reader Service Card


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Three, rugged, high gainamplification systems allow-ing use of 4 sets from oneantenna on all 82 channels.Especially designed for bet-ter color reception.

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MAY 1970. for more details circle 125 on Reader Service Card

DEALER SHOWCASEt:htt t`tt ' t

numbers on Reader Service Card Requests will be handled promptly

COLOR TV

Finished indark pine

An Early American television con-sole is among five color television setsand a B/W model introduced. The

703

CF722N is finished in dark pine andhas a 23in. picture measured diag-onally (295sqin. viewable). It in-cludes Sylvania's Color Bright 85 highcontrast picture tube and the Gibraltarchassis designed for maximum reli-ability. The television has the InstantColor feature which assures a pictureseconds after the set has been turnedon. Also included are automatic finetuning control (AFC) and lightedchannel indicators. Manufacturer'ssuggested list price for the CF722N is$579.95. Sylvania.

BIAS SUPPLY 704

Three separatebias supplies

Announced is a bias supply for colorTV alignment. The company's earliermodel, BE113, provided only two

negative output 20v supplies. TheBE156 supply meets the demands ofthe TV manufacturers by providingthree separate 25v supplies that canbe switched positively or negativelyas indicated in the alignment instruc-

tions. Tube operated receivers requirenegative voltages while most solid-state receivers specify positive volt-ages. The seventh range of negativezero to 75v has been provided to meetthe specifications of the manufacturerswho use 67.5v to bias the chroma am-plifiers during alignment. The seven -in -one bias supply is said to be uni-versal so that it can be used with anysweep and marker generators. Allthree supplies are well filtered at 1/10of one percent ripple and have littleor no interactions between them. Priceis $24.95. Sencore.

705

CCTV CAMERA AND MONITORAutomatically adjusts toline voltage variations

An all solid-state circuit televisioncamera and 9in. monitor designed tomeet the need for an economical yetreliable CCTV system is introduced.The new units are compatible withexisting systems and offer the samequality as the heavy duty industrialCCTV system. The camera incorpo-rates the latest space-age technologywith all components, except the vidi-con and deflection assembly, on a sin-

gle snap -out circuit board for opti-mum serviceability. The camera in-cludes standard features not generallyavailable with low-cost units such asthree -in -one lens kit for wide, medi-um and tight angle viewing and noexternal or exposed controls except asimple on/off switch. Once installedand adjusted, the unit cannot be ac-cidentally misadjusted. The camera isdesigned to automatically adjust toline voltage variations typically en-countered in large plants and indus-trial buildings. The unit also has a24vac operational capability whichoften eliminates the need for powerline and conduit installations. Thecamera provides 650 lines horizontalresolution and is equipped with an RFoutput which permits hook-up to any

standard broadcast TV receiver. Idealfor retail stores, banks, manufacturingplants, transportation companies orany CCTV application with a standardindoor environment, the camera ispriced at $625 and the 9in. monitor$175. Motorola.

TV CARTON/DISPLAY 706

Converted in secondsinto a dealer display

A specially designed shipping cartonfor six portable television sets thatcan be converted in seconds into adealer display case is introduced. The

three -color, self-contained display/shipping carton requires only threesquare feet of floor space and con-tains 9in. models in white (1), red(2), avocado and white (2), and wal-nut grain (1) cabinets. The headerdisplay card, when set in place, readsas follows: "Take me along. New1970 Admiral Quality Playmate 9Portable TV. The anytime, anywhere,television set. . . . In sparkling decora-tor colors to brighten every room inyour home. Designed for the patio,bedroom, family room, den, kitchenand workshop." The upper front ofthe carton is scored, and when re-moved, it displays a row of three re-ceivers. There is also room for dis-playing three additional units out oftheir cartons. Admiral.

INSULATING SPRAY 707

Coating withstandsup to 30kv

An improved high voltage insulat-ing spray is announced. The aerosolspray is based on the original insulat-ing formula developed and sold to TVtechnicians for more than ten yearsunder the name NO -ARC. Reported-ly, it has been impossible to use the


original NO -ARC formula in aerosolform because when it dried, it cloggedthe valves. The aerosol leaves a tough,thick, smooth protective red insulat-ing coating capable of withstandingup to 30kv. The spray is excellent for

11l1A611111/Ilfill

WA.

stopping arcing and corona shorts inhigh voltage circuits, especially oncolor chassis. The aerosol is also rec-ommended for "potting" componentsas well as waterproofing and insulatingprinted circuit boards and exposedwiring. NO -ARC is available in an 8oz can for $2.79 net. Chemtronics.

STEREO SYSTEM 708

With omni-directionalspeakers

An Astrosonic custom stereo radio -phonograph that features duo omni-directional speakers is introduced. Thenew dimension in omni-directionalspeakers is designed to project stereo

sound in every direction. The unit isequipped with the Air -Suspensionspeaker system. Speakers are com-pletely isolated from their environ-ment so that the cones literally "float"back and forth for superb response,eliminating feedback and distortion.Two deflector cones disperse sound afull 360 degrees from top and bottomof each speaker system. The modular

Now it costs lessto own the best

oscilloscopeyou seed.

The New RCA WO -505A Solic-State Oscilloscope

MCWIE

' Inexpensive Quality

tOptional DistributorResale Price

The best you need is the new 5 -inch RCA WO -505A, allsolid-state oscilloscope. It makes yesterday's general-purpose 'scopes look old-fashiored.

At just $298.501 the WO -505A offers an unmatched list offeatures usually found only in more expensive, laboratorytype instruments. For example there's the all solid-statecircuitry... an illuminated graph screen calibrated directlyin volts, and a deep -lip bezel for exceptional clarity. Theregulated power supply minimizes trace bounce and pro-vides excellent stability. And the camera mounting studsoffer still more evidence of the functional value built intothe new WO -505A.

But you've got to see this new RCA 'scope in operation-see the sharp, clean trace it provides-to appreciate it.Some statistics: High -frequency response, usable to 8 MHz. High Sensitivity (.05 V p -p ranee). DC vertical amplifier; DC/AC ,nput. Return trace blanking ... Trace polarity reversal switch ...

Phase control. High-fregLency horizontal sweep: solid lock -in on 5 MHz. Preset TV "V" and "H" frequencies for instant lock -in. Built-in square -wave signal fry: calibrating P -P voltage

measurements. Provision for connection to vertical deflection plates of

CRT.Some statistics! For complete cetails, contact yourRCA Distributor.

RCA I Electronic Components I Harrison, N. J. 07029. . . for more details circle 134 on Reader Service Card

MAY 197073

AFirIOW

AUTOMATIC

STAPLE GUNSCUT WIRE & CABLE

INSTALLATION COSTS. . . without cutting into insulation!

SAFE! Grooved Guide positions wire forproper staple envelopment! Grooved DrivingBlade stops staple at right depth of penetrationto prevent cutting into wire or cable insulation!

.41No. T-18-Fits wires up to

3/ 16" in diameter.BELL,

-*I°.), TELEPHONE,THERMOSTAT,

.1 INTERCOM,

i IBURGLAR

ALARM1) and other low

voltage wiring.

' Uses T-18staples with 3/16" round crown

in 3/8" leg length only.

No. T-25-Fits wires up to1/4" in diameter.

Same basic constructionand fastens same

-

wires as No. T-18.

Also used forRADIANT

HEAT WIRE

Uses 1.25 stapleswith 1/4" round crown in 9/32",.3/8", 7/16" and 9/16" leg lengths.;

T-18 and T-25 staples also available in Monel andwith beige, brown and ivory finish at extra cost.

No. T-75-Fits wires and cablesup to 1/2" in diameter.

RADIANT HEATCABLE,

OF CABLE,WIRE CONDUIT

COPPER TUBINGor any non-metallic

11 sheathed cable.Also used as

DRIVE RINGSin stringing wires. r

Uses 1-75 staples with 1/2"flat crown in 9/16", 5/8" and

7/8" leg lengthy/0

Arrow Automatic Staple Guns save 70% in timeand effort on every type of wire or cable fasten.ing job. Arrow staples are specially designed withdivergent -pointed legs for easier driving androsin -coated for greater holding power! All -steelconstruction and high -carbon hardened steelworking parts are your assurance of maximumlong -life service and trouble -free performance.

Ask your Electrical Supply Dealeror write for further details.

Saddle Brook. Now Jorscy 07663

"Pioneers and PacesettersFor Almost A Half Century"

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

74

DEALER SHOWCASE

custom unit is in walnut with metaltrim. The speakers measure 1 lin.long, 11 in. deep and 15in. high. Thetuner -changer unit is 25in. long, 16in.deep and 81/4 in. high. A Micromaticrecord player with diamond/sapphirestylus handles records with precisionand greatly lengthens record life. Con-stant turntable speed is provided by asynchronous four -pole motor. Addi-tional features: muting switch whicheliminates noise during change of rec-ords; automatic shut-off which turnsoff the player and amplifier after thelast record has played; tone -arm brushto prevent record wear; and lock -downlatches that permit moving the com-ponent without damage to the player.Included are 45 rpm adapter and dustcover. The tubeless solid-state radiobrings stereo FM, noise -free monauralFM plus powerful AM radio. A tunedRF state on FM provides optimumsensitivity and selectivity. The 20w( EIA) solid-state amplifier contributesessential power and flexibility to pro-vide undistorted music reproductionwith maximum total purity. Audiocontrol functions include separatevariable bass and treble plus com-pensated loudness and stereo balancecontrols. A no -drift FM AutomaticFrequency Control (FM/AFC) keepsFM stations "locked -in" and an indi-cator light shows when stereo FM isbeing received. Auxiliary connectionsinclude input and output jacks forcomponent tape recorders and players,as well as jack for stereo headphone.The Astro-Sonic Component FM/AMRadio -phonograph System (Model1E9274) has a retail price of $279.90.Magnavox.

VIDEOTAPE SYSTEM 709

Complete low-cost

system

A videotape system package is in-troduced. The VR-50 record/play-back system comprises a 1/2in. video

tape recorder, crystal controlled vidi-con camera and an 8in. receiver/monitor. The video tape recorder is

a 1/2in. unit made by Sony for Gen-eral Electric. It is compatible with allother Sony 1/2in. VTR's, includingbattery operated portables. Complete-ly solid-state, the recorder is a helicalscan type with two video heads andone audio head. The camera is thesolid-state Model VX-922, with crystalcontrolled 15,750Hz horizontal fre-quency. It features 550 line resolution,dual focus, 4000 to 1 automatic lightcompensation and a 25mm f1.8 lens.Completing the package is a SonyCVM 51 UWP-9in. receiver/monitor.This unit can be used to pick up off -the -air broadcasts and process themfor videotaping. It can also be used asa playback monitor. The package iseasy to operate because it plugs to-gether with ease and most controls areautomatic. It can he used for tapingbroadcasts off -the-. ir, as well as thepickup of the vidicon camera. If amicrophone is added, sound and pic-ture are recorded simultaneously withgood synchronization. The VR-50package sells for $595. GBC.

CASSETTE STEREO 710

Features a

fast forward/fast rewind

An addition to the line of car stereoplayers is a cassette stereo tape player,Model CS -204. It features a fast for-ward/fast rewind control and uses

the same pre-recorded cassettes thatare in such widespread use in homestereos and portable cassette players.The cassette car stereo is turned onautomatically when you insert the cas-sette through the dustproof door. Thecassette is ejected automatically whenthe end of the tape is reached, or itcan be removed at any time by push-ing the reject button. This also servesto turn the unit off. There are sep-arate volume, and tone controls, plusa balance control. An indicator lampglows when the set is on. The unit isall solid-state and operates from a 12vcar battery. The lightweight, compactunit mounts easily under the dashwith a mounting bracket provided.Specifications: Power Source: 12vcar battery (neg. ground); Output:lOw (each channel); Frequency Re-sponse: 40-10,000Hz; Track system:4 track, 2 channel; Tape speed: Weips; Semiconductors: 19 transistors, 1

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SERVICE DATA FOR MORETHAN 20 BRANDSTV TECH MATICS is the ideal Ser-vice Data package for today's mod-ern technician. It includes com-plete schematic diagrams and vitalservicing data for every TV receiv-er produced by more than 20 lead-ing American Manufacturers for1965, 1966, 1967, and 1968. All dia-grams and servicing details arecompletely authentic, based on in-formation provided by the originalequipment manufacturers. Eachyear's coverage is permanentlybound into two convenient -to -usevolumes which open flat to 11" x291/2", ready to provide you with in-stant service data at your work-bench. Some of the diagrams areas large as 58" x 22".

EASY TO USETV TECH MATICS is easy to use.Brand names are arranged alpha-betically by model year. No morehunting through several file draw-ers to find the schematic you need!And at the special low price, thinkof the savings you will enjoy onyour schematic needs . . . think ofthe time you'll save by having theschematics you need right at yourfingertips in handy, permanently -bound form!TV TECH MATICS is the ideal wayto cut down your schematic expen-ses, and to enjoy the convenienceof having all your data needs rightat your fingertips.

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for only $29.95through 1968. Included is a clearlydetailed and annotated TV sche-matic diagram for each specificmodel. You also get complete re-placement parts lists, alignment in-structions, tube and component lo-cation diagrams, plus key wave-forms and voltage readings . . . allthe information you need to serviceover 90% of the TV receivers you'llencounter!Compare that with the over $100 ayear you may now be paying forcomparable information.

STREAMLINED AND CONVENIENTAll the information for a given mod-el is contained on two facingsheets. The special bound -leaf for-mat allows pages to lie flat whenopen. Each volume is organized al-phabetically by manufacturer, thennumerically by model number. Inaddition, a handy Chassis ModelFinder is bound into each volume.Regular list price for each year'scoverage 2 BIG volumes - is$19.90. All 8 volumes normally sellfor $79.60. Your price is ONLY$29.95 ...a savings of nearly $59.00!

r

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MONEY -BACK GUARANTEEYou MUST be satisfied that TVTECH MATICS is the greatest bar-gain in TV Schematics ever offered.Order at our risk for FREE 10 -dayexamination. Prove to yourself theyare worth many times the price.You can return them in 10 days forfull refund or cancellation of in-voice. No need to send money. But,the supply is limited, so fill-in andmail the NO -RISK coupon today toobtain these time -saving, money-making manuals.

-CONTENTS -CONTENTS 1965 MODELS

Covers al 1965 models for: Admiral, Airline,Andrea, Coronado, Curtis Mathes, Dumont, Elec-trohome, Emerson, Firestone, General Electric,Magnavox, Motorola, Muntz, Olympic, Packard.Bell, Philco, RCA Victor, Sears-Silvertone,Setchell-Carlson, Sylvania, Truetone, Westing.house, and Zenith . . plus all color sets 1960-1965. at no extra cost!PUBLISHER'S LIST PRICE $19.90

CONTENTS 1966 MODELSCovers all 1966 color and B & W models of: Ad-miral, Ai:line, Andrea, Coronado, Curtis Mathes.Dumont, Emerson, General Electric, Hoffman.Magnavox, Motorola, Olympic, Packard -Bell, Phil -co, RCA Victor, Sears-Silvertone, Setchell-Carl-son, Sonora, Sylvania, Truetone, Westinghouse,and Zenith.PUBLISHER'S LIST PRICE $19.90

CONTENTS 1967 MODELSCovers all 1967 color and B & W models of: Ad-miral, Airline, Andrea, Coronado, Curtis Mathes,Dumont, Emerson, General Electric, Hoffman,Magnavox., Motorola, Olympic, Packard -Bell,Philco-Ford, RCA Victor, Sears-Silvertone, Setch-ell-Carlsc.n, Truetone, Westinghouse, and Zenith.PUBLISHER'S LIST PRICE $19.90

CONTENTS 1968 MODELSCovers all 1968 color and B & W models for: Adwiral, Airline, Andrea, Coronado, Curtis -Mathes,Dumont, Emerson, General Electric, Hoffman,Magnavox, Motorola, Olympic, Packard -Bell, Phil -co -Ford, RCA Victor. Sears-Silvertone, Setchell-Carlson, Sonora, Sylvania, Truetone, Westing-house. and Zenith.PUBLISHER'S LIST PRICE $19.90

LARGE PAGES contain complete circuit schematics, replacement parts lists, alignment instructionscritical part locations, important waveforms and voltage readings.

NO RISK COUPON-MAIL ODAYTAB Books, Blue Ridge Summit, Pa. 17214[] I enclose $29.95 for which please send me your complete 8 -Volume Tech,-Matics Schematic

postage prepaid.

FJ Please invoice me for $29.95 plus postage. Same return privileges.

Name

Company

Address

City State Zip(Paid orders shipped prepaid. Pa. resident add 6% Saes Tax. Outside USA 10% extra.)

offer

ET57

MAY 1970... for more details circle 108 on Reader Service Card

75

DEALER SHOWCASE

diode, 4 thermistors; Dimensions: 77/8in. W x 23/4 in. H. x 6 11/16in. D;Weight: 6'/albs. Price $89.95. Hitachi.

SPEAKERS 711

Dome cap provides directivityof high ranges

Announced is the release of theImperial series of full -range customspeakers. The line consists of widerange single cone speakers, customdesigned and engineered for studioand home. Each speaker is individ-ually handcrafted to exacting specifi-cations and tolerances. The speakerreportedly will deliver sound qualityequal to the finest two and threespeaker systems. Cone shaping tech-niques, together with Barium Ferritemagnets for high magnetic flux, deliv-er true sound to all input levels. Thespecial dome cap at the apex providesdirectivity of the high ranges. TheImperial line consists of: FR -4A, 4in.speaker with I6oz Barium Ferritemagnet. FR -5A, 5in. speaker with20oz Barium Ferrite magnet. FR -6A,6in. speaker with 24oz Barium Ferritemagnet. FR -8A. 8in. speaker with

36oz Barium Ferrite magnet. All ofthe speakers develop a claimed basi-cally flat audio response at all levels

of input. Dealers will be supplied withan attractive walnut counter displayfor point of sale merchandise. Speco.

712CASSETTE TAPE RECORDER

Features hiddenminiature microphone

Introduced is the Model 110 Cas-sette -Corder featuring a built-in hid -

flfteless1000°heat

Instant, precise heat ft1001 uses -- shrink tubing

soldering-desolderinforming, bonding, deburrin

drying, setting adhesiveWorld's most complete lin

Models from 200-1000'Send for new free Catalog 10

you can holin your han

den electret condenser microphone.The unit is light weight, compact,easy to operate and features the Sony-matic Recording Control which au-tomatically adjusts varying sound lev-els to a constant volume when record-ing. It also features an auxiliary highlevel input for recording from radio,television, telephone pick-up or otherhigh level sources. In addition, anEnd -of -Tape -Alarm gives an audiblewarning signal when the end of thecassette has been reached during re-cording. The unit measures 51/2 x 23/4x 93/4in. and weighs less than fivepounds. It has a piano -key -type push-button release and cassette ejector forquick and easy access to tape cas-

settes, as well as piano -key -type push-buttons for other control functions.The unit may be operated with eithera built-in snap -on battery pack con-taining four "C" cells or a recharge-able nickel cadmium battery pack.

''IT'S GOOD BUSINESS

TO HIRE THE HANDICAPPED."

ISN T THAT A GREAT IDEA, SNOOPY?

THE PRESIDENT'S COMMITTEE ON EMPLOYMENTOF THE HANDICAPPED, WASHINGTON, D. C.

76. for more details circle 130 on Reader Service Card


The unit includes a cardioid micro-phone with remote start and stopswitch, earphone, leather carryingcase and a 60 -minute tape cassette.Price $99.50. Sony.

DESOLDERING TOOL 713

Self -cleanstip when loaded

Introduced is a low-cost desolderingtool. The Soldavac is within the pricerange of everyone, yet it offers similarfeatures of the industrial desolderingtools. The high vacuum desolderingaction is accomplished by release of aspring loaded plunger. The tool is re-loaded by pushing forward on theplunger tab until latched. To desolder,

simply position the tip of the loadedSoldavac tool lightly against a heatedsolder joint and depress the triggerlever. Molten solder is instantaneouslydrawn up into the barrel by the highvacuum stroke. The desoldering toolmade from lightweight, durable plas-tic is easy to handle and it self -cleansthe tip each time it is loaded. Retailprice $2.95. Edsyn.

STEREO TUNER 714

Employs five gangtuning capacitor

Introduced is the Model AT -200UStereo Tuner which incorporates afive gang tuning capacitor in its frontend as well as three field effect tran-sistors. The front end is designed withemphasis on sound quality, selectivityand sensitivity. This unit incorporates

hybrid IC's and mechanical filters inthe IF stage. It also has an active filterfor siih-carrier elimination, a high -

blend noise canceler circuit, and anadjustable FM separation circuit.TEAC.

CASSETTE CIRCULATOR 715

Ideal accessory forcontinuous play

A cassette "circulator" a snap -ondevice that gives continuous playbackcapacity to automatic cassette chang-ers, is announced. The CC6 circula-tor-a simple but ingenious devicewith no moving parts-makes possible12 hours of non-stop, no -repeat play-back and then starts the cycle overagain. It functions with four to sixcassettes, automatically flips each forsecond -side play, and re -stacks the cas-settes for playing again. A cassettemoves into the changer's playingchamber and, when finished, is pushedforward by the next cassette. The

fourth cassette nudges the first 'overthe hill' and it slides down and backinto the playing stack. Styled in tintedplastic and standing five inches high,the circulator is simply snapped on forinstant use. It is compatible with No-relco cassette changer models 2401,

240 IA, and 2502, as well as Bell &Howell models 332 and 337, and theAmpex Micro 90 and 95. List price is$19.95. Norelco.

TELEVISION/FM/AM RADIO 716

Rechargeable battery provides3.5 hours of viewing

Introduced is the Pandora ModelTR-425BA. At the touch of a button,a 5in. TV screen pops up from astreamlined carrying case. The unit is

Don't shoot till you seethe tenths of a volt.

The sure way to troubleshootsolid state TV is with a scopethat measures DC.

Take Leader's five -inchLBO -53B

It gives you a drift -free DCinput, so you can see thosetenths of a volt. It gives you abandwidth to 10 MHz. And itgives you a sensitivity of10 mv/cTri or better.

Now for the shocker. You canhave a Leader LBO -53B forjust $223, about half the priceof any other scope with thesame capabilities.

Since the proof is in theseeing, we direct you to yourLeader distributor. Ask to seeour color bar generators too;you haven't seen the finestuntil you've seen Leader's.

Seeing is believing.Leader Instruments Corp.

37-2i 2;ih Street, Lcng Island City, r7. Y. 11101, (212) 729-7411

. . . for more details circle 127 on Reader Service CardMAY 1970 77

DEALER SHOWCASE

crafted in midnight black with silvertrim. It contains a built-in FM/AMradio-making it a complete portableentertainment unit weighing 121/2Ibs.The colloid -type batteries fit inside theset but contains no liquid-the chemi-cal is "suspended" in a colloid gell,with never a worry about leakage. Thereceiver features overnight rechargingand provided 3.5 hours of viewing ona single charge. The battery has a life -span of more than 500 hours. The unitfeatures up -front slide -rule tuning forUHF, an up -front 31/2in. dynamic Panasonic.

speaker and personal earphone. Thealuminized picture tube with the coil

heater insures long tube life. $179.95.

CHANNELLOCKGives You More In Hand Tools Including

THEHANDIESTPLIERSOF THEMALLAsk any good mechanic. He'll tell you hisCHANNELLOCK tongue and grooversare the handiest pliers he owns. Try one... you'll agree. A word of caution: be SUREyou're getting the original, genuineCHANNELLOCK. It's the only tongue andgroove pher with machined, smoothworking, undercut channels that never jumpout. Look for the CHANNELLOCKtrade mark on the handle.GET ALL THE FACTS. Send for ourcatalog . .. yours for the asking.

tt:1106,_.-4P'A`)Ami

MEADVILIF PA 7e

CASSETTE TAPE 717

Frequency responsefrom 30 to 20,000 Hz

Introduced is a tape cassette calledSuper Dynamic SD tape. The cassetteoffers high fidelity reproductionclaimed from 30 to 20,000 Hz, with avirtually flat response curve from 50to 10,000 Hz. This is made possibleby a new type of gamma ferric oxidedeveloped especially for high fidelityreproduction. The tape features great-ly improved signal-to-noise ratio; italso substantially reduces head wear.All remarkable properties of tape arebased on a combination of new mag-netic materials, a special binder sys-tem and coating technique as well asan exclusive surfacing process. The

new ferric oxide lomulation emplo)sa needle -like particle shape as com-pared to the rectangular shape ofstandard tape oxides. This permitseight times greater density of magneticparticles, improving resolution and re-ducing sound distortion. The newbinder system reduces cross modula-tion and static charge. There is noshedding of magnetic coating, so drop-outs are eliminated. The thickness ofthe magnetic coating is controlled to.001mm, resulting in low level fluctua-tions. The tape is packaged in theC-60. TDK.

718CARTRIDGE TAPE RECORDER

Features hiddencartridge bin

The Bainbridge, Model RS -820S, 8 -track stereo cartridge tape recorderwith FM/AM and FM stereo radio is

introduced. It features a hidden car-tridge bin and four full -range dynamicspeakers with 32w of output. The unit

. . for more details circle 109 on Reader Service Card


features solid-state design, ac bias anderase. An accidental -erasure guardstops the tape automatically at theend of the last channel. In the selec-tion of FM stations, the AFC controllocks in signals to assure drift -free re-ception. Sliding volume, balance, bassand treble controls are offered. Retailprice $349.95.

BATTERY DISPLAY 719

Self service conveniencesaves space

Announced is a transparent plasticbattery display which saves restockingtime and counter space. At the sametime it stimulates battery sales withself-service convenience. Impulse card-ed merchandise is held in removableside hangers. Batteries are gravity fedinto position with every sale. Ideal dis-

play for high-trallic areas-reusableand an eyecatcher as a single displayor side -by -side units. Stocks flashlight(both "C" and "D" sizes), penlightand transistor batteries. Burgess.

HEAD DEMAGNETIZER 720

Built intocassette cartridge

A demagnetizer which removes ex-cessive magnetic buildup from cas-

43

sette-equipment heads is introduced. Aflat, mylar-copper laminate lead wirepermits closing the cover of the player.Other features include a pilot lightand operation on standard current.The Model TD -10 lists at $8.30. Ro-bins.

POWER SUPPLY 721

Soi,_ stateconstruction

Introduced is a power source foralmost any digital, linear or total sys-tem application. For digital applica-tion the Model PZ-801-A employs ahigh efficiency power conversion cir-cuit to provide output currents to 5aor 25w from 0-25 volts. Regulation isclaimed better than .2 percent andripple less than 10mv. With the flickof a switch, the unit becomes a regu-lated (.1 percent) low ripple (lmv)0-25v, la source for linear or generalpurpose applications. The unit fea-tures a 10 -turn voltage control, rear

panel remote sensing and program-ming, electronic current limiting,floating output, versatile bench or

rack mounting case, and one yearwarranty. Only silicon diodes, tran-sistors and integrated devices areused. Price is $78. Viking.

p

ANTE NA COFtP0FtATION

HMO E. RIAEINSCIAMID1General

Manaqc

BROOKS 1""SSUITE 2") 01020 15114 SIRE

COLORADODENVER, 80202

(AC 3031 892-1481

ANNOUNCING...a new line of patented TV antennas

from a most reliable sourceThe new ACA Citation lineoffers a complete selection ofVHF, UHF, FM reception in colorand black/white. Priced for to-day's market, with all of the topquality features you expect, in-cluding gold -anodized, high ten-sile aluminum elements, d e cutimpedance correlators, dualaction director/reflector screenand tetrapole collector element.Also, available from ACA -antenna preamplifiers, boostercouplers, matching transformersLine up today with ACA!For complete details, write orcall:

ANTENNA CORPORATION of AMERICABrooks Towers. Suite 22-D 1020 15th St. Denver. Colo. 80202 Tel. 303 892.1081

MAY 1970

. for more details circle 103 or Reader Service Card

How to cool offhot-headedcustomers...

Install AdmiralSuper-Britereplacement colorpicture tubes withthe 3-year warranty.

Admiral is the only replacement color picture tubewith a 3 -year warranty. That's a full year more pro-tection for your customers.

Admiral Super-Brite replacement color picturetubes aren't rebuilts. They're brand new. Andthey're available in the U.S.A. and Canada. FromAdmiral, producers of more rectangular color pic-ture tube sizes than anyone in the world.

Now, watch your customers warm up to you forsteering them right.

Ad,tMo k ofPoo y

Admiral Corporation warrants this picture tube to be free from defectsin material or workmanship for 3 years after date of sale to the customer.Admiral's obligation is limited to supplying a suitable replacementpicture tube. This warranty is effective if the picture tube is registeredwith Admiral within 10 days after date of sale to the consumer.


NEWS

OF THE INDUSTRY

Fairchild DuMont AnnouncesImplosion Protected CRT

A computer readout CRT with implosion protection isannounced by DuMont Electron Tubes, a division of Fair-child Camera and Instrument Corp.

According to E. W. Swenarton, division sales manager,this tube is certified to meet the Underwriters Laboratories,Inc. testing criteria for bonded frame picture tubes.

This tube, the DuMont Type KC2827P31M has beenextensively tested for performance, life, and safety. Theclose spacing between operator and terminal in most ap-plications dictate strict safety requirements. This tube isbut one of a series of terminal oriented system displaytubes that range in size from 23/4 by 33/8 in. up to 161/2 by201/2 in. with resolution capability up to 40,000 distinctspots per square inch of screen.

The tube can be mounted in any position and can bedriven by highly efficient transistor and/or IC circuits. De-sign parameters include low heater power, zero power lowvoltage electrostatic focus and low magnetic deflectionpower. The small 20mm diameter neck contributes to theoverall small size and performance. DuMont can designany size and shape CRT to meet your requirement of me-chanical, electrical or safety designs. Price is under $40.00for production quantities. Samples can be obtained in threeto five weeks, ARO. Fairchild.

Color CRT SalesUp in 1969

Color television picture tube unit sales were up 1.3 per-cent to 6,255,000 units in 1969, according to figures re-leased by the EIA Marketing Services Department.

Sales to the renewal market increased 19.3 percent to765,000 units, while exports were up 54.9 percent to 175,-000 units, EIA statistics show.

Unit sales of TV picture tubes were down 6.5 percentduring 1969, totaling 11,232,000 units compared with12,018,000 units in U.S. factory sales during 1968.

Monochrome TV picture tube sales amounted to 5,077,-000 units valued at $80.5 million during 1969, a decreaseof 14.7 percent and 9 percent respectively from unit anddollar sales during 1968. Dollar sales decreases were reg-istered by sales to original equipment manufacturers, therenewal and export markets.

Belden to ExpandElectric Cord Plant

Belden Corp. will expand its Electric Cord Products Co.manufacturing plant at Franklin, N.C. The announcementwas made by Robert W. Hawkinson, president of the Chi-cago -based company.

He said a 17,000sqft addition will be constructed aspart of the company's present 46,000sqft plant, which hasbeen in production since 1966. "The expansion will in-crease Belden's cord manufacturing capacity by 25 percentat Franklin. Scheduled for completion in the third quarterof 1970, this major project reflects our confidence in theappliance cord market, particularly in the original equip-ment segment," Hawkinson said.

The expansion will add 50 to 60 employees to the Frank-lin plant's current employment of approximately 190.


The expansion is the second major capital expenditureannounced by Belden. On March 3, the company disclosedplans to construct an insulation compounding facility ad-jacent to its Jena, La., plant. The automated, $3 millionfacility, scheduled for completion in the second quarter of1971, will produce insulation used at the company's trans-portation products and electrical lead wire plant at Jenaand at other company plants.

Belden's wire, cable and cord products are used in elec-trical, electronic, transportation and consumer markets. Inaddition to its plants in Franklin, N.C., and Jena, La., Bel-den has plants in Chicago, Richmond, Ind., and Pontotoc,Miss. A manufacturing subsidiary, General Wire and CableCo., Ltd., has two plants in Cobourg, Ontario, near To-ronto.

RCA Plans to Provide ServiceFor All Makes of Television

RCA has announced plans for the establishment of anew subsidiary company to provide servicing of all makesof television sets and other home entertainment units.

Anthony L. Conrad, Executive Vice -President, Services,said the new company will operate independently of theRCA Service Company branches, which will continue toconcentrate exclusively on the servicing of RCA productsand Whirlpool appliances.

"The decision to service other brands was based on ex-tensive internal studies and governmental agency consumerreports which indicated an expanding need for service inthe entire consumer products industry," Mr. Conrad said.

The new company will be initially established in selectedurban areas and gradually expanded to operate on a na-tional scale. Present plans call for the first of the new ser-vice centers to be opened in the Philadelphia area by mid-year, with the San Francisco area listed for late September.

TV, Radio and Tape EquipmentHave Record Sales Year in 1969

1969 total U.S. sales of consumer electronic products,including domestic label and foreign label imports, werereleased by the Electronic Industries Assn.'s MarketingServices Department. Television, radios and tape equip-ment sales hit all time highs. Phonograph sales were onlyslightly below their record year of 1968.

Total television sets sales were 13,307,889 comparedwith 13,211,206 sets sold in 1968, which was the indus-try's next best year. Color TV sales were 6,191,307 sets in1969 vs. 6,213,347 sets in 1968, and monochrome TV 1969sales were 7,116,083 sets vs. 6,995,736 sets in 1968.

Total U.S. radio sales passed the 50 million unit markfor the first time. Radio sales were up 9.6 percent in 1969,

TOOL KITSFIELD ENGINEER TOOL KIT JTK-17

rue 041%.oy

More than 100 fne toolsrequired for servicing inthe field. Used on com-munications eqaipment ,business machines, com-puters, all kinds of elec-tronic systems. All toolsand VOM tester are fur-nished in deluxe attache'case. Write tot details.

- ELECTRONIC ASSEMBLV TOOLS

MECINTSEINT -rc).:DL.e Etrict ALLOYl34117 N. 44th Street, Phoenix, Arizona 85018

Join theAdmiral

S&H bookclub.

Get a free book of S&H GreenStamps with every Admiral Super-Brite color picture tube purchase.

Get a certificate worth 600 stamps(% book) with every Magna-Britecolor picture tube you buy.

Every book puts you closer toowning a set of luggage, a pooltable, or any other item in the 180 -page S&H Gift Catalog, including a14 -foot sailboat.

Register now with your AdmiralDistributor and learn all the detailsabout "A Brighter Year Ahead." Oruse the Reader Service card.

Admiral Corporation,3800 Cortland Street, Chicago, Illinois 60647.

Admiral.. . . for more details circle 123 on Reader Service Card

MAY 1970

for more details circle 102 on Reader Service Card

81

You're making money in electronics now.

RCA Offers 4 Ways to Make More.

Study at home...set your own pace.

RCA Institutes has an easy approach

to bring you bigger earnings.

r

COLOR TV:During this courseyou'll perform over50 experiments-and receive all partsand instructions tobuild your owncolor TV.

The cost of the Color TV Kit is includedin the tuition in both the beginner's program andthe advanced course in color TV servicing.

Course is based on the latest receiver circuitryand equipment.

SOLID STATE

TECHNOLOGYNew courses includethe latesttechniques in this field.Information you musthave if you are to service the multitude of solidstate instruments and devices used in TV, Digital,and Communications equipment.

FCC LICENSE TRAINING:Choose the course for the FCC License you want:third, second or first phone. If you need basictraining first, apply for the complete LicenseTraining Program. Get your License-or yourmoney back.

CATV TRAINING:You'll receive two comprehensive lessons, coveringthe practical phases of CATV systems in either theTelevision Servicing or Communications courses.Licensed by New York State Education Department. Approvedfor Veterans. Accredited Member National Home Study Council.

RCAMAIL THE COUPON NOW FOR COMPLETE INFORMATION.

RCA INSTITUTES, Inc., Dept. 225-005-0

320 West 31st Street, N.Y., N.Y. 10001Please rush me FREE illustrated catalog. I understandthat I am under no obligation.

Name Age(please print)

Address

City

StateL

82

ZIP


NEWSOF THE INDUSTRY

totaling 51,352,742 units vs 46,832,140 in 1968, and per-sonal radio sales of 39,413,857 units also was a recordyear-and radios with FM exceeded AM only radio salesfor the first time ever. Auto radio sales of 11,938,885 unitsin 1969 were slightly behind the record 12,509,841 soldin 1968.

Phonograph sales of 6,320,248 in 1969 were slightlybelow the 1968 total of 6,494,612.

Although EIA's total U.S. sales figures for magnetic tapeequipment (a category which includes reel to reel, car-tridge and cassette units) are incomplete, tape recorder andcassette sales increased 24.3 percent over 1968-6,929,527vs. 5,573,145. Also tape cartridge player imports doubledin 1969, indicating a record year in the entire tape equip-ment category.

Color TV Ahead Consumer Electronics Off

Distributor sales to dealers were generally off the Octo-ber 1968 pace. However, color television, auto radio andportable and table phonograph year-to-date sales wereslightly ahead of 1968, the Electronic Industries Assn.'sMarketing Services Department reported.

Distributor sales of color television sets to dealers weredown 22.5 percent during October as compared with salesduring the same month the year before. In October, 506,358sets were sold to dealers, compared with 653,691 the samemonth last year, EIA reported. Color TV sales to dealerswere 4,568,602 sets for the year-to-date, 1.4 percent aheadof the 4,507,537 sets sold in the same period in 1968.

Monochrome TV sales in October, at 442,161 sets, weredown 17.7 percent from the 537,250 sets sold in the samemonth last year. Total TV sales to dealers, on a year-to-datebasis were down 3.2 percent; 8,692,808 in 1969 to 8,977,045sets the first ten months of 1968.

Total phonograph sales decreased 16.4 percent in Octo-ber over the same month a year ago and is now 1.1 percentbehind a year-to-date basis.

Total radio sales to dealers declined in all categories andare now running 6.6 percent behind on a year-to-date basis.

Essex Acquires Fort Wayne Tool & Die, Inc.

The acquisition of Fort Wayne Tool & Die, Inc., by Es-sex International, Inc., was jointly announced by WalterProbst, Essex chairman, and Richard G. Nill, president ofFort Wayne Tool & Die.

The firm joins Essex as a wholly owned subsidiary of thecompany and will continue its operations on an indepen-dent basis under Nill's direction. All production and salespersonnel of Fort Wayne Tool & Die will be retained andall manufacturing processes will continue at its Engle Roadplant in Fort Wayne.

Founded in 1940, Fort Wayne Tool & Die is a pioneerinnovator and manufacturer of the automatic stator wind-ing equipment used by electric motor manufacturers.

The acquisition was described by Essex as part of thecompany's long standing program of servicing the totalelectrical industry in depth with raw materials, components,finished products, as well as with production orientedequipment.

Essex International, Inc., is a broadly diversified pro-ducer of electrical products and controls, metal products andplastics. The firm operates 96 plants in the U.S. and Can-ada through 10 manufacturing and marketing divisions.


the set choice is yours...

the antenna choice is...

P7IVCI:7411

N EW '70 SERIES TV ANTENNAS

Send for free Catalog 20-556

NAME

ADDRESS

CITY STATE ZIP

THE FINNEYCOMPANY34 WEST INTERSTATE STREETDEPT. 110-5BEDFORD, OHIO 44146

. for more details circle 113 on Reader Service CardMAY

83

NEW PRODUCTSFor additional information on products described in this section, circle thenumbers on Reader Service Card. Requests will be handled promptly.

STAPLES 722

Chemically coated toimprove holding power

Announced is the development of aspecial chemical coating process, de-signed to greatly improve the perform-

ance and holding power of their T-75Staples.

The new staple, to be known as"Grip-Tite," is for use in the T-75Staple Gun Tacker, a model speciallydesigned for fastening any wire orcable up to 1/z in. in diameter.

Reportedly the improved stapledrives deeper, penetrates more flushand provides many times the grippingpower of plain staples without thisspecial chemical coating.

The staples are available in 9/16,5/11 and 7/8 in. leg lengths, each size in-dividually boxed. Arrow.

CB ANTENNA

100w of power froma 5w CB set

723

Announced is a CB base stationcalled the Boss 404.

The antenna uses yagi beam designwith tapered elements to focus signalinto a narrow beam, only 52deg atthe half power points. Operating in

LittleGIANT

04111 11111S

140111 LINES

S

SENCORE CG19 CADDY BAR COLOR GENERATORSmall enough, light enough to carry right in your tube caddy-so you have ithandy on every color TV service call.Little giant in performance. All crystal controlled standard RCA licensed colorbars, crosshatch, white dots, vertical lines, horizontal lines. Rock solid or yourmoney back.

New circuitry. Less current drain permits full voltage regulation on all circuits,and Increases battery life.Timer range doubled over previous models.

Lowest priced unit available, $84.50 All Domestic Made

IN STOCK AT YOUR LOCAL

-11-PARTS DISTRIBUTOR1\1C CDI=k

NO l MANUFACTURER OF ELECTRONIC MAINTENANCE EQUIPMENT

3200 Sencore Drive, Sioux Falls, South Dakota 57100

both the horizontal and verticalmodes, the antenna reportedly willproduce a signal with an effectiverated power of 100w from a 5w CBset.

The absence of gimmick wireswhich distort radiation patterns per-mit this antenna to achieve optimumspacing with a 17ft boom. The an-tenna can be rotated with a low-costrotator instead of the expensive unitsgenerally required for ham antennaswith similar performance. Aircraftaluminum construction with heat -

treated boom and elements allows theantenna to withstand 90 mph winds.

The optimum spaced elements pro-duce maximum front -to -back andfront -to -side ratios greatly reducinginterference. Precision horizontal andvertical gamma -match feeds, identicalto those used on A/8 ham antennas,produce a VSWR of less than 1.5 toI, and I to I if the user likes to finetune.

The antenna lists for $99.95. An-tenna Specialists.

GOZINTA 724

Cleans controlswithout removing chassis

A tool designed for effective clean-ing and lubricating controls on TVand auto radios, from the front panelis introduced.

It is manufactured from an alumi-num alloy with female threads ma-chined on one end. This adapts to thebushing of the control after the knobis removed. A plastic valve extensionis contained on the other end, whichwill pressure -fit the usual aerosol valveof contact cleaners.

Pressure on the valve will force -clean the control. An adapter is sup-plied for car radios, which eliminatesthe necessity of removing the radiofrom the car.

.. for more details circle 136 on Reader Service Card


The Gozinta, Model No. WM, andcar radio adapter is packaged with a

three -ounce aerosol can of Luhritc.Dealer price is $2.67. Workman.

SPEAKERS

Round design utilizesflat plastic panel

Announced is the addition of a se-ries of flat plastic speakers. Designa-ted as the "Roly-Poly" series, thespeakers feature a round thin silhou-ette construction which permits exactRETMA replacement of the conespeaker equivalent. Constructed en-tirely of polystyrene material, they of-fer the advantages of wide range hi-fireproduction, low distortion, bi-direc-

tional wide angle dispersion and highsensitivity. Light in weight, impervi-ous to moisture and climatic condi-tions and with minimum depth, thespeakers are ideal for all hi-fi appli-cations, public address, industrial, au-tomotive, build -in, and replacementservice.

A typical unit in the series is theModel RP8. Diameter of this modelis 8in. and overall depth is 1 in. Fre-quency response is 40Hz to 20,000Hz,and power handling capacity is lOwRMS, 20w peak. Sensitivity is 90dB/ Mfor one watt electrical input. Direc-tional characteristics are essentially

cardioidal with bi-directional disper-sion. The unit uses an electromagnetmovement and standard impedance is811 although other impedances areavailable on order. The speaker canoperate at full ratings over the tem-perature range of -20°F to +175°F.Weight is 11 oz. Magitran.

NEW ENDECO

DesolderingKits

All you need to handlealmost any desolderingand resoldering job!

MODEL

300K

KIT

SHOWN

Kit 300K includes the famous Endecopencil desoldering iron Model 300, sixdifferent size tips (.038 to .090) for anyjob, tip cleaning tool, and metal standfor iron ... all in a handy lifetime steelstorage box. $19.90 net. Model 300K-3with a 3 -wire cord $20.90. Also a similarkit for military users. Kit 100K with largeEndeco iron (Model 100A) is $27.40, and3 -wire Kit 100AD-3 $28.40.

SEE YOUR DISTRIBUTOR OR WRITE

ENDECOENTERPRISEDEVELOPMENTCORPORATION

5127 E 65th St., INDIANAPOLIS, IND. 46220

725

4CRI

40

4p,

VIDEO/RF SELECTOR- 726CONTROL CENTERNo externa poweris required

The Model CCV3, a three -positioncontrol center that has many uses invideo or RF layouts is introduced.

* -4

---jorykio-fif -

Typical uses allows control of threeTV cameras and a monitor, or threemonitors and one camera; or forswitching low -power RF antenna sys-tems.

The "push -ON" and "push TO RE-LEASE" switches allow the user tooptionally select any of the equipmentdescribed.

The unit uses standard "M" type(SO -239) connectors on input and alloutputs. The easy access connectorsare located on the rear of unit. Noexternal power is required for opera-tion. No internal resistor is used to

DECISION

MAKER

The Sencore CRT Champion. Jimge and jury when it comes tocolor CRT analyzing. Reaches a verdict in seconds - tells you ifthe tube has adequate emission, and if it will track in the TV set.Automatic color tracking according to industry standards withexclusive 3 Gun G2 Control.

One-step controlled rejuvenation with automatic RC timer. ASencore exclusive.

Lots more, too. So try the decision maker - the Sencore CRTChampion - at your cistributor today. You'll reach the rightverdict. $119.50

NC01=tNO I MANC/f ' ,441,1117

426 SOUTH WESTGATE DRIVE. ADDISON. ILLINOIS 60101


... for more details circle 137 on Re:der service Card

85

NEW PRODUCTS

affect impedance matches. Cross talkbetween adjacent channels is negli-gible.

It has a rugged construction anddecorator styled to be placed with anyof the newest video and audio equip-ment. Size: 55/8 in. x 21/2 in. x 3 9/16in. Priced at $19.95. Alcoswitch.

DIGITAL MULTIMETER 727

Low voltagesensitivity of lktv

Announced is the accuracy of a dig-ital display, coupled with unmatchedlow -voltage sensitivity of I pv per dig-it, is available for the first time in amedium-priced 31/2 digit dc mul-timeter.

With its wide range of voltage, re-sistance, and current measuring capa-bility, the Model 160 reportedly offersas much dc versatility as is likely tobe useful in any field other than basicresearch.

DC voltage range of this instrumentis reportedly ± 1 pv per digit on themost sensitive range to ± 1000 voltsmaximum, in seven decade ranges.Also, an ac/dc probe is available.

Accuracy, over all ranges, is ± I digit,or ±0.1 percent of the reading atany range.

Instrument circuitry is designedwith a buffer amplifier at the frontend instead of the input chopperfound in many other meter circuits.The input impedance is IOM on allbut its lowest range, where it is I M.Use of the buffer amplifier also makesit possible for the unit to drive a re-corder. The analog recorder outputjack is located on the back panel of

+1970

the instrument. Recorder output is ± 1volt, at up to I ma.

Normal -mode rejection character-istics are excellent, providing a rejec-tion ratio of 80dB at a voltage of linefrequency or twice line frequency onthe most sensitive range. This valuedecreases to 60dB on I kv P -P or high-er ranges. Common -mode rejection isgreater than 140dB, or up to lkv P -P.

Settling time to rated accuracy is2sec.

Check'em,ALL!

TRANSISTORS

FET'S IN OR"AM

OUT OF CIRCUITThe TF17 works every time using tried and proven signal injectiontechniques. New, improved tests on special RF transistors andthe latest high power transistors, mean that the TF17 is the onlyup-to-date transistor tester on the market. A new, exclusivesetup book in rear compartment guides you to every test forover 12,000 transistors and FETs. The book is not needed forgeneral service troubleshooting. Regular transistors are checkedfor beta gain and Icbo leakage. FETs are checked for trans -conductance and Igss leakage. Only $109.50

1=tNO I MANuf AC TUNER Of ELECTRONIC MAINTENANCE EQUIPMENT


The unit spans a resistance rangefrom the lowest reasonable valuesthat can be measured using two -ter-minal leads (0.151 per digit), to al-most open -circuit readings (2,000M,full scale), in eight decade ranges. Ac-curacy is claimed within ±0.3 percentof readings, or ± I digit on the 10011to 1M range, decreasing to ± 10 per-cent on the 100M range. The 1,000Mrange, intended for relative resistancemeasurements only, gives -±50 percentaccuracy, satisfactory for these pur-poses.

Operated as an ammeter, it is ca-pable of excellent accuracy in mea-suring current all the way from welldown in the field-effect transistor leak-age current range, up to 2a-as muchdc current capability as is likely to beof interest in normal bench use. Scalerange is -±0.1na per digit to ±2a fullscale, in eight decade ranges. Accu-racy is ±0.2 percent of reading, or± I digit for all ranges. Input resist-ance is 100K on the 0.1p,a range, de-creasing to 0.152 for the la range.

Temperature stability is reportedly-±0.3pv per degree centigrade, ±1pvper day after a 30 -minute warm-up.Temperature extremes will not pro-duce a zero shift down through the100mv range. Even on the most sensi-tive range, in the typical air-condi-tioned lab, no more than a one digitzero shift (1p,v) will occur in thecourse of an average day,

A rear panel switch permits a choiceof grounded or floating input. Resist-ance between circuit ground and chas-sis ground is greater than 100M,shunted with a 0.01pf capacitor. Cir-cuit ground may be floated up to±500v with respect to chassis ground,for the most exacting measurements.

Function and range selection posi-tions on the single knob control arearranged for maximum ease of opera-tion. Voltage and resistance readingsectors, usually the most frequentlyused, are adjacent.

The 160 operates on 105/125v or210/250v, 50 or 60Hz and is there-fore usable nearly anywhere in theworld. Power consumption is 15w.The unit measures 31/2 x 83/4 x I lin.and is priced at $545. Keithley In-struments.

VTVM 728Large meterwith mirror scale

Introduced is the Model 1700C, anadvanced design VTVM that will meetthe technician's most rigid require-ments. It has a large 6 -in. wide -viewmeter, mirror scale, with highest qual-ity components utilized throughout.Wide frequency response on ac volt-age for compatibility with color TV

... for more details circle 138 on Reader Service Card86


servicing. FM multiplex troubleshoot-ing and general industrial application.Double jewelled, inspected D'Arsonal

movement with individual side andtail weights.

This VTVM weighs 5Ib and is 81/2x 6 7/16 x 41/2in. Priced at $49.95,wired. Kit form $39.95. Mercury.

VIDEO DISC RECORDERPlugs into CCTVor monitoring system

A low-cost, instant playback, slowmotion and stop action video disc re-corder which can be plugged in to anyCCTV or video monitoring system isintroduced.

Called the 1310 Video/Disc Re-corder, the unit records a 10 or 20secsegment, either direct from camera orfrom a videotape recorder, for imme-diate playback at speeds adjustablefrom 2 frames per second to 60frames per second. During playback,any one of 60 frames can be stoppedand held indefinitely for study or

729

analysis. The recorded segment canalso be transferred back to the video-tape recorder to provide a video pro-gram combining "live action," slowmotion, and stop action.

The unit has been thoroughly fieldtested and features pushbutton con-trols designed so that if the operatorpushes the wrong button, or anywrong sequence of buttons, the opera-tion of the recorder will not be af-fected.

Applications for the recorder areseen in instructional systems, securityand surveillance, CATV, process con-trol, Q.A. monitoring, equipment andmaterials testing, tape recorder check-out, and other applications where the

addition of instant playback, slow mo-tion and stop action increases the ver-satility of CCTV and video monitor-ing systems.

Weight of the recorder is 341b corn -

NOW A ONE STOPSHOPPING CENTER FORYOUR AUTO RADIO AND8 TRACK STEREO PARTS.AT FACTORY DISCOUNTS

WE ARE AUTHORIZED PARTSDISTRIBUTORS FOR:

DELCOBENDIXMOTOROLALEAR JETTENNAMETRAAUTOMATICON GUARDCRAIG

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STERO LOCK MOUNTS

SEND YOUR ORDERS WITHPART NUMBERS TO

Laran Electronics, Inc.3768 BOSTON ROAD

DEPT 100 BRONX, N.Y. 10469

OR SEND MODEL, MAKE ANDDESCRIPTION OF PART WANTED.

SOLID STATE

ONE GUNBOOSTER

FOR COLOR TV

WENDSCOLOR

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MODEL VNGI RESTORES

RED, BLUE

OR GREEN

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MO OILNO.

W G I

orat

BEFOR //AFTERinstallation of

ONE GUN BOOSTERBoosts the one weak color neededfor a BALANCED color picture.

MANUFACTURED BY

WORKMANSARSOT FLORIDA

let,Vta.PRODUCTS NC

... for more details circle Service Card

Ge e foryo ew

solid state

instant -on

MIGHTY MITE ICE Now faster than ever. Instant -on action with all solid state

FET circuitry-no waiting for warn -up. New push-button operation speeds up every test-saves

you valuable time. New 13th socket checks still more tubes-now over 3000including foreign. New hi -style case-vinyl-clad and brushed steel. A profes-

sional instrument designed for p-ofessionals.

At your distributor now, only $99.50

ENCORENO r MANUFACTURER O, MAiNtENANCE EOUIPMEN'


. . for more details circle 126 on Reader Service C rd. for more details circle 13R on Reader Service Card

87

A NEW AND IMPORTANTDEVELOPMENT FOR

TV SERVICING12 MODELS

SANS -A -FUSEFITS IN SAME

SOCKET AS CHEMICALOR AMP FUSE

COLOR CODED CIRCUITBREAKER REPLACEMENT

FOR CHEMICAL ORAMP FUSE

SAVES TIME AND FUSESWHEN LOCATING SHORTSIN TELEVISION CIRCUITS

DEVELOPED ANDMANUFACTURED BY

WORKMANROT 3020 SARASOTA, FLA 33571 PRODUCTS. INCTELEPHONE A. Code SIT 955 - 4242


SAVESthat

COLOR TUBE(WITH CATHODE HEATER SHORTS)

GET THE NEW

2 -IN -1

ISOLATIONBRIGHTENERS

BOOST OR NO BOOST, AT THEFLIP OF A SWITCH.

MODEL CR- 300 FOR 70° TUBESMODEL CR- 350 FOR 90° TUBES

e/e aficTelematic Div. U. X.L. CORP.BROOKLYN. N.Y. 11207. U.S.A.

NEW PRODUCTS

plete, and all components are housedin a portable case. Dimensions are 8in. H x 131/4 in. W x 14th in. D andpower equipment is 115vac, 60Hz.Newell.

FM ATTENUATOR TRAP 730

Attenuates FMband by 20dB

A MATV trap which attenuates theentire FM band by 20dB is introduced.Reportedly the first unit of its kind,the new FM attenuator trap is de-signed for use in broadband MATVsystems. Strong FM signals are at-tenuated before they are fed from theantenna to the headend amplifier toeliminate cross modulation in the lowVHF band (Channels two to six) andsecond harmonic beats in the highVHF band (Channels seven to thir-teen).

Designated Model 8488, the unit iscompact, rugged and easy to installand designed to pass all VHF chan-nels without attenuation.

It provides a 20dB attenuationacross the entire FM band and chan-nel six is reportedly virtually unaffect-ed.

The trap has less than 1.5dB at-tenuation at 88MHz, which is the edgeof channel six. VSWR is good at 1.2to 1.

OD. SL 8488

SMOOTHLINFM TRAP

-20 db FROM92-108 MHz

While the trap does not pass UHFfrequencies, it can be used in an '82'channel system. It is simply installeddirectly before the VHF input to thehead end amplifier. List price $12.50.

CB MOBILE ANTENNA 731

VSWR of 1.5 to1 or better

Introduced is the Lancer 500 Se-ries, designed for the CB'er lookingfor the classic features, styling and

performance previously available onlywith much higher priced mobile an-tennas.

Each of these antennas (Models500A, 500B and 500C) is designedwith a deluxe high "Q" coil resultingin reduced mechanical height whilereportedly maintaining power capa-

MODEL MODEL MODELC -500A C-500 B C -500C

bility up to 500w. Each high impact,solid-state, polystyrene coil is perma-nently sealed against moisture. Models500B and C feature a machinated ca-pacity coupler that works with theloading coil to extend the skin area ofthe radiator for increased antennaefficiency.

An exclusive guying device locatedjust above the coil reportedly preventsantenna lay -back at top highwayspeeds. The antenna is factory pre -tuned to minimum VSWR of 1.5 to 1

or better with feed point impedanceof 52f1 and the -14 in. critical adjust-ment may be made after mounting.

For lowering, the Model 500C hasa break -over (hinge) feature so thatantenna may be lowered and securedfrom either trunk or bumper mount-ing position.

Each antenna is topped with a staticball which reduces corona effect andprevents loss of power.

Antennas come complete with topquality, corrosion -resistant materials,along with detailed, easy -to -follow in-stallation instructions. Mosley.



toot., ii.,B,,,,z;/,,,,

Ca0

JERROLD DISTRIBUTORS HAVE SOMETHINGBIG BREWING FOR YOU

BUY SOME JERROLD COLOR TV RECEPTION AIDS-ANTENNAS, BOOSTERS, COUPLERS, CABLE KITS,AND TRANSFORMERS-THINGS LIKE THAT ...

And there's something special that's likely to go with it.

Maybe some free Jerrold reception aids.

And ask about those free Jerrold barbecue grillesand the high-powered drills.

See your Jerrold Distributor soon.

He's ready to wheel and deal. And some of his dealsare too good to last forever.

If in doubt, write: Jerrold Electronics Corporation,Distributor Sales Division, 401 Walnut Street,Philadelphia, Pa. 19105

Focusing onone thing-betterreception

. for more details circle 124 cn Reader Service CardMAY 1 9 70

a GENERAL INSTRUMENT company

CATALOGS ft

BULLETINS

Silicone Products 400

A 44 -page book lists the completeline of silicone industrial products.The book is divided into four sections-RTV silicone rubber, greases andcompounds, fluids, and insulating var-nishes. Each section contains a prod-uct and property listing, suggested ap-plication techniques and recommend-ed procedures for handling specificmaterials. The silicone grease andcompound section also has a table ofFederal stock numbers that correspondwith GE's product numbers. GeneralElectric.

TV Coaxial Cable 401

An illustrated data sheet on coaxialcable for UHF/VHF home color tele-vision reception is published. Thissheet describes the advanced design ofDura-Color RG-59/U type cable, partno. 5750. Dura-Color is 100 percentshielded, the shield consisting of a my-lar film coated on both sides with alu-minum foil and four stranded tinnedcopper drain wires for conductive con-tinuity. This type of shield is electri-cally more stable and is highly resist-ant to moisture. The cable acceptsstandard F type 59/ U connectors. Thelow loss capability and other outstand-ing characteristics are described in il-lustrated form. Also included are de-scriptions of two 7511 Dura-Colorkits, one for UHF and VHF receptionand the other for UHF or VHF re-ception. Columbia.

Product Testing 402

You've Seen It a Million Times,"a leaflet explaining the significance ofthe Underwriters' Laboratories label,is being offered free of charge to in-terested parties. Large quantities areavailable to organizations and firmsfor distribution to their employees orcustomers. The brochure is designedto acquaint the consumer with somebasic facts about Underwriters' Lab-oratories, Inc., and the testing activi-ties behind the familiar UL seal. UL.

Tape and Accessories 403

An illustrated, multicolor, 40 -pagecatalog-a complete guide to cassette,cartridge and reel-to-reel tape and au-dio accessories is published. The cata-log is not only the biggest ever issuedin its 15 -year history, but it also rep-resents the broadest line of compara-ble products available from any onemanufacturer. In addition to cassette,cartridge and other tape -recorder

products in various sizes and priceranges, the catalog incorporates phonoaccessories, patch cords, adaptors andXL and XLP audio connectors. Afront-page index and parallel presen-tation make it easy to find any of thehundreds of individual products.These range from brushes to splicers,and from all-U.S.-made cassettes andother tape formats to such amateurand professional electronic devices asdemagnetizers. Robins.

Wire, Cable and Electronic 404Products

An illustrated 63 -page catalog is

available featuring wire, cable andelectronic products. Complete and ex-tensive delineation has been made re-garding all types and construction ofwire and cables used by the commu-nications trades. Pictorially depictingwire and cable as well as electronicproducts, this IDS/ M ATV equipmentcatalog has a handy thumb-thru indexas well as a complete alpha-numericalindex. Vikoa.

Solid -State Components 405

Published is a new short form cata-log containing: Junction FETs, MOSFETs, Dual FETs, Multi -ChannelFET Switches, Current Limiters, Volt-age Controlled Resistors, Digital In-tegrated Circuits, Linear IntegratedCircuits, Integrated Drivers, and Driv-er/Switch Combinations. Siliconix.

Capacitors 406

A line of welded -construction, non -polarized capacitors are added to theexpanding variety of aluminum elec-trolytic capacitors. The new units,type TNPW, have welded connectionsjoining the risers, and external leadsassure a low dissipation factor andfreedom from intermittent or opencircuits. They offer a complete rangeof capacitance values from 1.0 to100µf and are available in voltagesof 25, 35 or 50v. Price: under $.10 to$.40 each, depending on type andquantity. The new capacitors are fullydescribed in I.E.C. Capacitor BulletinEC81. International.

Test Instruments 407

A test equipment catalog (Bulletin2080) which introduces five new in-struments and gives complete operat-ing specifications for equipment serv-ing needs for industrial electronic andelectrical testing including radio andTV servicing, communications, auto-motive, air conditioning, refrigerationand heating is available.

The Model 202 ACCU-LOG is thefirst VOM with maximum accuracyanywhere on a quasi -logarithmic scale.The logarithmic portion of the seven-

inch scale gives consistent percent ofreading accuracy, while the linear por-tion permits easy zero -adjust.

Model 603 portable chart recordersare available in ac voltage, ac current,dc voltage and dc current measuringranges. Other special features includ-ing a 110vac event channel, pressuresensitive recording paper and fourbuilt-in, switch selectable chart speeds,make this a useful instrument formonitoring power consumption orvoltage fluctuations.

Two multi -testers (Models 256,257) measuring voltage, current, ca-pacitance and resistance, a currentleakage tester (Model 229) and a solidstate VOM (Model 313) round outthe list of new items in Bulletin 2080.Simpson.

Electronic Electrical and 408Hobbyist Books

The 1970 catalog describing over125 current and forthcoming bookscovers the following subject areas:Schematic/Servicing Manuals; Broad-casting; basic technology; CATV; elec-tric motors; electronic engineering;reference; television, radio and elec-tronics servicing; audio and Hi-Fi hob-by and experiment; test instrumentsand transistors. Among the new andforthcoming titles featured is the re-vised edition of the "Tube/TransistorSubstitution Guide." Tab Books.

Sub -Miniature Indicator 409Lights

The 56 -page Selector Guide aids inthe selection and procurement of morethan a million and a half indicatorlights, readouts and illuminated pushbutton switches. Data is given in illus-trated sections and each section is de-voted to indicators by size (Sub -Mini-atures, Miniatures, Large) or by prod-uct groupings. Separate sections of theguide are also devoted to illuminatedpush button switches and readouts.Four indexes, including one with mili-tary cross-references, assist the user inobtaining the desired information.Dialight.

Tools 410

A 24 -page, fully illustrated catalogoffering several new, unusual and ex-tremely useful hard -to -find tools isavailable. The catalog contains pre-cise and detailed descriptions and ap-plications of each tool in this uniquecollection. The tools are rarely soldby industrial distributors or stores.Among the many new items offeredare tungsten carbide saw blades, min-iature riffier files, torch lamp, min-iature screws, nuts, bolts, washers,stainless steel pliers and hard chromedneedle files. Also included are wood


working tools, electronic tools, jewel-ers' tools, diamond pencil and glasscutter, unusual solders, rust remover,hard -wire cutters, glass drills plusscores of other versatile hand toolsand small power tools. Brookstone.

Miniature Lamps 411

A 2.1 -page catalog containing valu-able basic design information, techni-cal discussions of the various param-eters involved in lamping and a use-able cross reference guide to lampsubstitution is available. The catalogfeatures a revised layout of technicaldata on each lamp, giving the all-im-portant design voltage for each lampfirst, allowing the engineer to tailor hisselection to the voltage required. Thetechnical discussion section of the cat-alog will serve as a valuable piece ofreference information for the engineerworking with lamps. Chicago Minia-ture Lampworks.

DEPTH FINDER ...continued from page 63

lamp can be simply and quickly in-stalled in the same clips after re-moving the defective lamp.

The Heath MI -29 maintenanceprovides for cleaning the slip -ringsand in addition has a motor speedadjustment. The slip -rings can beoccasionally cleaned using lighterfluid or other solvent. The servicemanual also states that if, after longperiods of use the motor governorno longer maintains the correctspeed, it may be necessary to cleanthe governor contacts. This simplyinvolves removing the small piece ofvinyl tape covering the access holeon the motor housing and applying acouple of drops of good contactcleaner or solvent.

The motor speed adjustment onthe MI -29 is more critical andshould not be tampered with unlessyou have checked all other possi-bilities for motor speed variation.The accuracy of the unit depends onthe motor speed. If the motor speedis at fault, remove the vinyl tapecovering the access hole located onthe motor housing. Rotate the motorby hand and find the adjustmentscrew in the hole. Place the trans-ducer in water with a known depth,then turn the unit on and note thereading. Turn the indicator off andturn the adjustment screw veryslightly. Take another depth reading

and keep re -adjusting the unit untilit reads the correct depth.

GENERAL HINTS

When installing or repairing theseinstruments, keep in mind that thetransducer is a delicate part of theunit and must be handled with care.All of these units operate from bat-tery -power and any deviation fromnormal operation should first leadto a check of the battery condition.Depth accuracy is determined by thespeed of the motor, which is also de-

termined by the condition of thebattery. Noise is one of the depth-finder's worse enemies and shows upas intermittent flashes on the indi-cator. Noise will be random, inother words, at no special depth.This could mean ignition shieldingof some type is required. Basically,the depth -finder units are easy to in-stall and service providing you un-derstand their operation. It could bea comfortable and profitable intro-duction into marine electronics foryour shop.

DEPENDABLE ANTENNAS AND

ACCESSORIES FOR PROFITABLE

INSTALLATIONS...

RMS COLOR BOOSTER UHF VHF

SINGLE DOWN -LEAD

ANTENNAS...

#CB -22: 22 elements, #CB -28:28 elements, #CB -34: 34 ele-ments. Adds mileage to UHF/VHFTV reception. Features ReynoldsAluminum Colonveld weather-proof Gold finish.

SCR 880

RMS MODEL CR-880 SOLID-

STATE UHF CONVERTEF...

Powerful amplifier and Local/Distant Switch provides 30 dbgain! Brings in clearest Colorand Black and White UHF recep-tion even in areas where otherConverters fail to!

.7.7TSF

RMS HAS THE MOST

COMPLETE LINE OF UHF

VHF FM SPLITTERS AND

MATCHING TRANSFORMERSFor all multi -set home instal-lations, master antennas, andclosed circuit TV systems. Allconfigurations for every require-ment.

,ite#

- "'

=-C-4UV

a'Ps

=CI B ',.

MIS n ,--s

es n

p,, .:,-.Hs 40U, 4 -Way

RMS HE 'VHF 'FM

HIGH GAIN 4 -SET COUPLER

Couple 4 TV and or FM Sets toa single antenna with low sig-nal loss- minimum interferencebetween sets. Or couple 2 an-tennas, (VHF, UHF or FM), to asingle down -lead.

UHF VHF 1 -WAY AND

4 -WAY HYBRID SPLITTERS

For multi -set home and masterantenna installations. Unbeat-able specifications. Also topperforming UHF,'VHF Tap -Offs.

Couplers, Splitters, Matching Transformers, Hybrid Splitters, Tap -Offs,and Color -Tube Brighteners are individually blister sealed on attractivePeg -Hang Cards. Write for latest Catalog-

RMS ELECTRONICS, INC.50 Antin Place, Bronx, N.Y. 10462 Tel. (212) 892-6700

DEPENDABLE ALL- PLASTIC

COLOR -TUBE BRIGHTENERS

Reusable. Simple installation.Plugs in between color tube andcolor tube socket. It CTB-70 for70° button base tubes. :,(..^CTB-90for 90 button base picturetubes.

See Us at the NEW "Par -s" Show Booths 4109.4111. for more details circle 135 on Header Service Card

MAY 197091

Get More Facts

ARM T N FOAMKEEPS TUNERS WORKING

BETTER, LONGER!

THISTUNER After 36,000 revolutions, the silver has

WAS USED AS IT been worn away. The tuner does notfunction on any channel.

CAME FROM THE MANUFACTURER

A A

THIS TUNER After 36,000 revolutions there is no sign of wear.The tuner brings in all channels, sharp and clear.

WAS SPRAYED WITH TUN -O -FOAM

THEPROFESSIONAL'STV TUNERCLEANERFoams into the tightestplaces. Won't cake up, dryout or detune. Keeps clean-ing and lubricating contacts each time channelis changed. Guaranteed to be the best tunerlubricant cleaner you've ever used, or moneyrefunded. Six-month no -callback guarantee.

1260 RALPH AVENUE,BROOKLYN, N.Y. 11236

For export: ROBURN AGENCIES INC., NEW YORK, N.Y. 10014In Canada: MAGNASONIC CANADA LTD., MONTREAL 9, CANADA


NEW PRODUCTS700 Color CRT One Gun Booster .24701 Soldering Iron/Power Unit 24702 Patch -Board 24703 Color TV . . 72704 Bias Supply .. 72705 CCTV Camera and Monitor 72706 TV Carton/Display 72707 Insulating Spray 72708 Stereo System 73709 Videotape System ..74710 Cassette Stereo 74711 Speakers 76712 Cassette Tape Recorder 76713 Desoldering Tool 77714 Stereo Tuner ......... 77715 Cassette Circulator 77716 Television/FM/AM Radio 77717 Cassette Tape 78718 Cartridge Tape Recorder 78719 Battery Display 79720 Head Demagnetizer 79721 Power Supply 79722 Staples 84723 CB Antenna 84724 Gozinta 84725 Speakers 85726 Video/RF Selector-Control Center 85727 Digital Multimeter .86728 VTVM 86729 Video Disc Recorder .. .87730 FM Attenuator Trap .. 88731 CB Mobile Antenna 88

CATALOGS AND BULLETINS400 Silicone Products 90401 TV Coaxial Cable 90402 Product Testing 90403 Tape and Accessories .. 90404 Wire, Cable and Electronic Products 90405 Solid -State Components 90406 Capacitors 90407 Test Instruments 90408 Electronic Electrical and Hobbyist Books 90409 Sub -Miniature Indicator Lights 90410 Tools 90411 Miniature Lamps 91

TEST INSTRUMENTS900 EICO Model 240 Solid -State FET-VOM 63

ADVERTISER'S INDEX101 Admiral Corp. 80102 Admiral Corp. 81

American Telephone & Telegraph 65103 Antenna Corp. of America 79

Co., Inc. 74105 B & K Division Dynascan Corp. . 2nd Cover.27106 Belden corp.107 Book Club-Tab Books 66-69108 Book Club 75109 Channellock, Inc. 78110 Chemtronics, Inc. 92111 Cornell-Dubilier112 Enterprise Development Corp.

3rd Cover85

113 Finney Co., The 83114 Ford Motor Co. 42115 GC Electronics, Inc. 30116 Gem City Tuner Service 32117 General Electric Co. 23118 General Electric Co. 37119 Grantham School of Engineering 92120 Heath Co. 41121 International Crystal 22122 International Importers 70123 Jensen Tools & Alloys 81124 Jerrold Corp. 89125 Kay -Townes Antenna Co. 71126 Loran -Electronics, Inc. 87127 Leader Instrument Corp. 77128 Lectrotech, Inc. 38129 Mallory Distributor Products Co. 20130 Master Appliance 76131 Panasonic 43

RCA Electronic ComponentsEntertainment Tubes 4th Cover

132 RCA Institutes 82133 RCA Parts & Accessories 33-35134 RCA Test Equipment 73135 RMS Electronics, Inc. 91136 Sencore, Inc. 84137 Sencore, Inc. 85138 Sencore, Inc. 86139 Sencore, Inc. 87140 Sprague Products Co. 31

Sylvania Electric Products 28 & 29141 Telematic Division UXL Corp. 88142 Tuner Service 19143 Winegard Co. 39144 Workman Electronic Products, Inc. 88145 Workman Electronic Products, Inc. 87

Zenith Radio Corp. 25

Technicians, Earn Your Associate

DEGREEmostly by correspondence

Accredited by the Accdt. Comm. of National HomeStudy Council. G.I. Bill Approved. Free catalog.Write: Dept. T

Grantham School of Engineering1505 N. Western, Hollywood, Calif. 90027. . . for more details circle 119 on Reader Service Card


Put your parts in order.All it takes is gen''us to a:rive at si:nplic-

i".y. This new display stand is Leceivirg. It'smore than a display stand. It's set up to cperatelike. a store within yaur store for instantservizing.

Here, within this unit, is a cm -replete stock3f al the wide range twist prongs you'll needplus micas, miniature electrclytics, ceramics,wide range tIbulars and dipped pi:13erlar.*The selection was based on an extensh.e studyof all capacitors used ir the replazernent market.Now, with the Re -Place, you're 'n the capacitor

replace-neni business. The Re -Place only takes2' x 5' in space and you have all your parts inorder.

'interested? Write for .3ur new cataL. onThe Re-PlaceTM capacitor line."The Repla:ers"-the most complete line of -eplacement capac-itors in the smallest possible rackage.

cv !SUM

We hope to see you at Booths 4202-04. for more details circle 111 on Reader Service Card

Air

'DuPont Trademark

L; ReceivingE Tube Manual

New and bigger than ever!The RC -27

Putyour11709sTywhereyourprofitsare.

Solid-state design is the big thing in electronics today,but your profit margin is-and will be for years-directlyrelated to your tube business.

That's why we keep on expanding and up -dating theRCA Receiving Tube Manual-the "bible"-to help youcontinue to save time (and make more money) in theservicing of tube -designed equipment.

Now 672 pages, the manual includes comprehensivetechnical data and curves for all active RCA receivingtubes ... a useful circuits section ... handy ApplicationsGuide . .. tabulated data on color and black -and -whitepicture tubes, voltage -reference and VR tubes ... plus aReplacement Guide.

Get a copy today from your RCA Distributor. It'salmost as indispensable as your tube -tester and V -O -M!

RCA1Electronic Components1Harrison, N.J. 07029'Optional Price

RCA

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