Audio research d 50 schematic

Page 1

CROSS-COUPLER PUSH-PULL PARTIALLY CATHODE COUPLED 248*R12

PUSH-PULL
AMPLIFIER CATHDDE FOLLOWER DRIVER 0'- AB" PUSH'PULL OUTPUT
H m (p.p~mpa) -/ MPGLSGC 6E ONLY
INPUT SENS. I [IOOPF w J
1.IOV,RMs FOR R9 25 R22 28
SOWATT OUT. _ m
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J1 C.. c; 2469 mo 5|er «30-110 van/7) IO/SONP +310
1 I 1: I I I TS-1(21
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ALT. 1
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CHANNEL ARCF. NO.
SHOWN 51003
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1% 150K 1/2w
10% 10/. + + + +
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c12 c1?
4-20/525 _ 2 5 4 4- 20/475 CHASSIS GROUND»
Affchigo' 0A ARC P-NOv IPOINT-BY TOP-
v12 2 2 v13 2'6 FRONT-LEFT PCB
r . MOUNTING SPACER.
5 W
3 DATE REV'SoNS T1115 PRINT CONTAINS PATENTED AND/OR OTHER
,3 .05/500 R' '2/4/59 INFORMATION CONSIDERED PROPRIETARY
: "2 [ZN/59 evAUDIO RESEARCH CORPORATION ANOIS FURNISHED
(R.CH.BIAS) R3 6/5/70 DU- 5°A ONACONFIOENTIAL BASIS FOR IDENTIFICATION
- R W70 " 505 PURPOSES ONLY.
R5 1/4/71 .. 50C
ARC FIND. Rs 2/4/71 . 509 U.S.PATENT N0.3,538,447
"00° R7 5/10/71 .. 5013-1
Ra 622/71 .. 50E AUDIO RESEARCH CORPORATION
ELECTROSTATIC R9 7/26/71 .. 50F MINNEAPOL S. MINNESOTA
SHIELD-GROUNDED R1O 12/6/71 .. 5OF-IB Wm.
THRU XFMRCASE --'l \ 1/ / DELETE R46 REv.12 EFFECTIVE- 9/15/72
' 4<1N2069A "" 2' 72
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57,56,59azu13 . DUAL 50F-I8 SCHEMATIC ECS-248- R12