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FROM GAIN
CONTROL
·
I
SP9MKIII PREAMPLIFIER - (LINE SECTION CIRCUlfRY) - PAGE 2 of
4
PAGES
------41._., __________ ,._ ______
8+285
R23
75K
G
R25AIIB
186.5
G
-
+46.1 2(7)
C29 1--.0-1
_..,__.1\/V\J~.--.......
\-a;_;:-----+-
G
5.0
..
.01
C9
,47
166
.
010
.
A20
·
.
56pf /
475K
. ·
/R21
·.
+26.7
200
·
A
COMMON
A22A+B
.
13.7K
+26.4
R31AIIB+CIID
2.40K
.
R59A+B
3.64K
·
A30
3.92K
C11
56pf
NOTE: DE-SOLDER
"A"
FOR -6 dB GAIN
NORMAL GAIN: 20dB
8-5-93
Q9
A27AIIB
21.5K
A28
475K
A29
200
MUTE-
OPERATE
RELAY
o NORMALLY
CLOSED
TO MUTE
CIRCUllAY
MAIN
OUTPUT
CHASSIS
AUDIO RESEARCH CORPORATION
5740 GREEN CIRCLE DRIVE
MINNETONKA, MN
55343-4424
PROPRIETARY NOTICE: THIS DRAWING CONTAINS PATENTED, PATENT PENDING,
PATENT APPLIED FOR, AND/OR OTHER CIRCUITRY CONSIDERED PROPRIETARY BY
AUDIO RESEARCH CORPORATION AND IS FURNISHED ON A CONFIDENT AL BASIS
FOR IDENTIFICATION PURPOSES ONLY.
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