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.

 [. . . ] MAINTENANCE MANUAL

C20
STEREO PREAMPLIFIER
(Serial No.  [. . . ] 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 0 1 2 3 4

DC Volts No. 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. High impedance VTVM is used to measure operating voltages. Resistance measured to grid,  (chassis) 3. * Denotes pin 7 of V8 grounded for this test. Control positions for tests are as follows; MODE SELECTOR STEREO 0 BALANCE 0 PHASE H. F.  [. . . ] Y. 
Phone-Area Code 607-723-5491
2M-AA117-201 BE012003 5-62 [. . . ]

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