United American Bosch Corp. 421 Schematic

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Product Information:
Model:421
Manufacturer:United American Bosch Corp.

Schematics Content:

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Page 1:

BOSCH PAGE 6-11
\ MODELS 420,421
. Schernatic Parts
UNITED AMERICAN BOSCH CORP. Socket Tr' sf
so _ __ __ SCHEMATIC WIRING nmcnsu
GENERAL DESCRIPTION
The American-Bosch Model 420 is a five-tube dual wave superheterodyne receiver. This model is for
110 volt 60 cycle operation and the Model 421 is for 110 volt 25 cycle operation.
The tuning range of this receiver is from 540 to 1,600 kilocyclas as indicated on the lower portion
of the dial scale, and from 1600 to 5600 kilocycles ae_ indicated on the upper portion of the ecele.
ELECTRICAL VALUES
R1 100,000 _ 1/4 w 105278 cis Variable gang) C21 -001 mf 500 V ~ ---- - 106405
R2 5,000 - 1/4 w 105271. C4 condenser g 107445 iglmmg egg 102500
R6 600 C8 .0001 mf mica ... .. 101145 C26 .01 mf 500 V ... ... 1076
R7 500,000 variable ... 107255 C9 .05 mf 200 V .. .. 106586 L1 Wave brag ,... ... 107454
ne 2,000 - 1 4 w 105445 c1o Part of .. 107415 l?niinns 1074 4
R12 1/4 meg - 1/4 w 105279 C14 Part of 107416 L6 coil ) .. 1 7415
/`. R15 1/4 meg - tone cont. 107251 C15 Part of ......... .. 107416 L7 assembly )
R14 1/2 meg - 1/4 W .... 105246 C16 .0001 mf. mica ....- 106417 L8 )
`._/ C1 .0005 mf. mica- part 1 34 .C;OifrrL;g53 V ...... ?30 lst Ig1F~? ... ... 107415
an 1.1. nu.. noun xn x.g. >>. :wma
v M ' 7, $1 Rectifier tube
9@ 9(R) ~. 2 Power Pentode output tube
` i 4.9 11 is second dee., A.v.o.>>'ana A.F. tube
: " \ Q' 4 LF. trimmer condenser
I W @ #5 LF. trimmer condenser
l _ qa] #6 1.1-. was
3* sun-vr O 'J . ?' #7 LF. trimmer condenser
';',;';7 @`@ Q ?@g?|| #0 LF. trimmer condenser
1, _ ?||@ $9 Detector oscillator tube
?'%;F_ #10 Oscillator trimmer condenser
/"` llOA\l\f<""' 2 | ~ \ EI;-'? 11 Antenna trimmer condenser
f Il, #12 Police Band Lag. condenser
I I Figure #1 I |
Publisher

Page 2:

PAGE 6-12 BOSCH
'l'rimmers ,Vol tags
UNITED AMERICAN BOSCH CORP.
SERVICE PARTS LIST
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mas 1 an 11111 11 11 1111
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3 '!,4'q ~.f15- 0 n _ \',\/, 5 Ai 1 mean '1-111 111111: - 1 Wm waive w11n11- - :um 1111114
agg. \; N f ` ` I _ 1 G mum nszso u111~11ff11- 111-11 111111 1111111
_ "~l5'.4;i:;!*?@?-?1?\"? = \l same 1-1111111111 11111 _ 11111121 111?11= 1>1111? 11111 _ 11111111 ??1n?11111- :cms 1111111111111 11111 111111.11
. 11111 1111111 mam 111541 r11e11111? 111-11 _ 4111 1111 11111 11111 mvzva aqpw- 111111 111-1111,
Publisher

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