User manual MCINTOSH C20 MAINTENANCE MANUAL
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Manual abstract: user guide MCINTOSH C20MAINTENANCE MANUAL
Detailed instructions for use are in the User's Guide.
[. . . ] and DESCRIPTION from Special components used in the C20 are listed below. [. . . ] Signal
Resistance in Ohms Unit Off 130K* 1M 2. 2K 5 5 360K* 56K 4K
(V1)
146 0 1. 0 5. 6 -5. 6 110 0 1. 0
--
12AX7
(V2)
146 0 1. 0 5. 6 -5. 6 110 0 1, 0 64 0 2. 4 5. 6 -5. 6 198 62 120
-- 130K* 1M 2. 2K 5 5 360K* 56K 4K _
120K* <50 1. 8K 5 5 14K* 1. 1M 100K
12AU7
(V3)
5 6 7
8 9 1 2 3 4
12AU7
(V4)
5
6 7 8 9 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 1 2 3
64 0 2. 4 5, 6 -5. 6 198
62 120 -- 104 0 . 7 5. 6 -5. 6 230 22 29 _
104
--
-- 120K* <50 1. 8K 5 5 14K* MM 100K -- 330K* 110K 1. 8K 5 5 9K 222K 22K
330K*
12AX7
(V5)
12AX7
--
(V6)
12AX7
(V7)
4
5 6 7 8 9 1 2 3 4 5 6 7
6X4
0 . 7 5. 6 -5. 6 200 22 29 250 20 70 5. 6 -5. 6 250 20 70 0 315 AC -- 6. 3 AC 0 __ 315 AC 335
110K 1. 8K 5 5 31K* 222K 22K
7K* 1M 47K
5 5
--
7K*
1M 47K 0 _ 580 . 1 0 -- 560 *
(V8)
NOTES: 1. Control positions for tests are as follows; MODE SELECTOR STEREO 0 BALANCE 0 PHASE H. F. FILTER FLAT LOUDNESS FLAT INPUT SELECTOR TAPE HD 2 0 BASS COMPENSATOR TREBLE COMPENSATOR TAPE 0 BASS 0 TREBLE RUMBLE FILTER, OUT TAPE JACK, TAPE COMPARE VOLUME ON, CCW 0 LOW FREQUENCY TRIM
C20 Schematic (Schematic No. SC117-201)
NOTES:
(1)
THlS
SCHEMATIC
APPLIES
TO C20
PREAMPLIFIERS
WITH SERIAL NUMBERS 6L700 AND ABOVE.
(2) ALL ROTARY SWITCHES ARE SHOWN IN THE E X T R E M E
COUNTERCLOCKWISE
POSlTION.
(3) ALL PUSHBUTTON SWITCHES ARE SHOWN IN THE
"OUT"
POSITION.
(4) RESISTOR VALUES ARE IN OHMS
±10%,
½WATT
EXCEPT AS NOTED.
(5) CONDENSER
VALUES ARE IN MFD
FOR
NUMBERS L E S S
THAN
ONE, AND IN
MMFD
FOR NUMBERS GREATER THAN ONE.
(6) IN SOME
UNITS
C104
MAY BE FOUND AS TWO S E P A R A T E 2000
MFD/15V
CONDENSERS.
(7) A RESISTOR IM SOME UNITS MAY BE USED AT THIS POINT TO ADJUST THE VOLUME THE VALUE IS MATCHED TO THE P A R T I C U L A R VOLUME C O N T R O L USED
CONTROLS
TRACKING
CHARACTERISTlC.
* THESE COMPONENTS HAVE A CLOSE T O L E R A N C E ON THEIR VALUE,
OR
HAVE
SPECIAL
CHARACTERISTICS SUCH AS
LOW NOISE OR A SPECIAL R E S I S T A N C E
TAPER.
Your C20 will give you many years of pleasant and satisfactory performance. [. . . ] The direct dial area code is 607.
LABORATORY INC.
2 CHAMBERS STREET, BINGHAMTON, N. [. . . ]
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