Fisher 20 A Service Manual

Page 1

PHOTOFACT Folder

w... m

FfllllER 12

SF] 423

FISHER MODEL
20-A

, 4., R , J,

>632,»

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45

TRADE NAME Fisher Model IO-A

FISHER MODEL
20-A

TYPE SET AC Operated Audio Amplifier

POWER SUPPLY 105-125 Volts AC-EO/GO Cycles

MANUFACTURER Fisher Radio Corp. , 21-21 44th. Drive, Lung island City, i, 11.1

TUBES (Four) Types lZAX'I/ECC83 AF Amp. -Phsse Inv. , (2) ELM/63% Outputw EZGO/EVA Rectifier
RATING .695 Amp. ® 117 Volts AC (GB Wm)

350m: RECT gm

9
[231"] 405V@ 69
Z

PHDNO INPUT AF AMP PHASE INV UTPUT
a @12AX7 @ ELM/6305
@ 6 0V
ML ,, W .
g; 7
e : .5v E 15
470K
® can:
- 355 V
"I V1 V2 V3 V4
e MAX? 6805 305 6V4
ile 470K 170K mm
7 1470K "UK 470K NC
5 WK 1250 1250 I
,1!) 0:1 .19 .1!)
5 ,ln .10 Do On
A i 170K TP lF NC
7 lie 3):: ISMIO llfln
7 ENG NC NC NC
9 no t 39m 9 35mm NC 33

THIS READING WILL VARY DEPENDING UPON (HE
toNDInDM 0F THL ELECTROLYTIC CAPAI: ITOR
CONNECTED IN YHE ASSOCIATED CIRCUIY.

I MEASURED FRDMPINJOFVL

NO NO CONNECTIUN CUY JUMPER WIEN
1? iii POINI USING Aux EDUIFMEN'I
HAVING LINE SWITCH
a sit nus usr FDR ALTERNA'IE
VALUE ox APPLICATION

be con. urslsuucr VALUES UNDER on: OHM
nor SHOWN on SCHEMATIC DIAGIAM

A PHOTOFACY SVANDARD NOTAIION SCHEMATK
Hound W. Sum a (an Inc. 195:

42342

HOWARD W. SAMS C CO" INC. Indianapolis 6.Indlanl

The listing of any available replacement part herein does
not constitute in any case a. recommendation, warranty or
guarantyby Howard W. Sums 4': Co. , Inc. , as to the quality
snd suitability of such replacement pm. The numbers of
these parts have been compiled 1min Information iurnished
:75;er W. Same & Co. , Inc. , by the inunuiumrers of

the particular type oi replacement put listed. Repro-
duction or use, without express permission, of editorial or
pictorial content, in any manner, is prohibited. No patent
liability is assumed with respect to the use 01 the inlorma-
tion contained herein. © 1958 Harvard W. Ssms a Cu. , inc. ,
indiampolls 6, lndiaun. Printed in 11.5. of America

BATE 12-58 SH 423

FOLDER 12

V'OZ
EGOW HIHSH

ll IIJII'IIH m 138

Page 2

PARTS LIST AND DESCRIPTIONS
TUBES (GENERAL ELECTRIC, SYLVANIA)

CHASSIS-BOTTOM VIEW

ITEM ITEM us:
No_ use TVPE m TYPE
v1 AF Amp. -Phue Tnv. 12mm 20:33 vs Output ELM/sans
v2 output Emu mags v4 Rectifier nan/ave
ELECTROLYTIC CAPACITORS
RAT NG REPLA EMENT DATA
ITEM CORNELL
ma AERovox MALLORV PYRAMID SANGAMO SPMGUE
Nor 00- VOlT- m" 12:. pm m, Pfizrfl PART Na, PART NE. PART N.» PART No.
CIA no «so mmazvm AREA-43M com mm. P TMT-H 1-155 TVL~3788
E .40 450 MT-dfilD
C .20 450
CR so 25 0559-123 mzsvao 93350-25 1039 10-50-15 MT-uzso TVA-1205
3) Alternate Pm rc-Eas-m.
FIXED CAPACITORS
Capacin values given in the raIing column are in In. In: Paper
Capacitors, and in mm. Ior Mica and Ceramic Cnpaciiors.
NG REPLACEMENT DATA
"EM RA CORNELL. NOTES
FISHER AERovox CENTRALAB MALLORY SPRAGUE
N W V0" PART Nol PART No, PART No. mama. PART Na. PART Na.
ca .1 200 csamoam 11mm DF-IM Guam GEM-m1 21mm
(:4 ea ccmapewxs PO-SI ea Ds-eao 1.106168 Dds-468 10% 0
c5 47 omen-Tom PO-SI 41 96.470 moan Ins-447 g)
ca 02 400 0539mm 149an2 DD-aoa cums: GEM-412 an:
(:7 To: 400 caapzoam Emu-02 DD-208 cums: Gamma ATM-s:
ca .01 can c-zm Ream-m 136-103 CUDESI GEM-an om-sl
®Some verslans may use 24mm! 1015mm; application: (Pm acczmpmm
®same versions may use 53m10% In an. appnc-uon (Part Eccmupeaoxs). C3 02 R7 R3 C5 R5 R5 R3 C4 R4 13 M1
CONTROLS
"EM TING REPLACEMENT DATA
Nu RESIST mum CENTRAIAR QAROSYAT IRC MALLORY INSTALLATION NorEs
ANCE' WATTS PART Nm PART Nu. PART No. PART NOT PART No.
BI 509K é R-582-117 JP-EM qu Adina! a)
Q Pm Ina-520.139 may he used m some vex-310nm
RESISTORS
Allwaltages I/Zwatt, or less unless otherwise listed. TRANSFORMER (AUDIO OUTPUT)
REPLACEMENT DATA
IL? MG 5 NOTES IL? TING {$513}: 5 if" 'MVEDNC mm Halldsuon Merit Rum sumo: Thordurwn Triad NOTES
OHMs WATT W" No- OHMs WATT P- - m SEC PART No. PART N9. PART Nu. PART Nu. PART Nu PART No. PART Na
as am acmareao '
112 470K RCZOEN'M 39 125:: 7( R-sss-m 1-: 10K 1m T-Eaa-us zuns ® A-smm A-33ll® 22393 a) (1) mm new
as man RCZOBFbalK am 4101: WW7 CT up n m
R4 22K Rczoarzza More I an sun gcflggé; m 40 mm s -
as 100K Romano: Ru m c 39 m
no Ioox Rczaamoax n 7W 3'5 ' FUSES
3., 47m; acauarm R13 330m 1 Rcamasz
How 1 Sumo versionl may use IEK In this IDPUICHCIUD (Pm manual-Lam. REPLACEMENT DATA
ITEM mum llTIElFUSE Euss
TVPE RATING mu N M"
No. e4 No. PART No.
TRAN F R
5 O MER (:mszz mm FUSE HOLDER FUSE HOLDER EusE HOLDER
m SAG 3A E-snoo moo; mom AC 3
'35 mm mm Hulldorson Meril Rum Siuncor Thordurxon Triad 250v (3A6 :A C an
0' FRI. SEC. 1 SEC 2 PART No. PART No. PART No. PART No, PART NO. PART No. PART NO. 250V)
11 Luv 100ch V muses-12
@.655A @,090A @2.3A WIRING DATA
General-use Unahialded Hook-up Wire V . . . . . . . . . . . . Use BBLDEN No. 3530 (Sand) Avnnlble In Ten Colon
SEC 3 SEC. I SEC. 5 8524 (Stranded) Avuhhle In nu Calm-a
v Power Cord ., . u 135mm No. 1765-3 (6 FL Laugh)
@M I'IzE-K (1; n. Lengm)