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ALPHA ONE/7R/8R/8P AMPLIFIER SERVICE MANUAL
3
Test Point
DC Voltage Alpha One
DC Voltage Alpha 7R
DC Voltage Alpha 8R/8P
20
0.0V
0.0V
0.0V
21 (protection off)
1.6V
1.6V
1.6V
21 (protection on)
5.0V
5.0V
5.0V
22
0.58V
0.17V
0.17V
23
3.4V
3.1V
3.1V
24
-3V
-2.7V
-2.7V
25
-26V
-29V
-29V
Between 26 & 27
3.4mV
3.4mV
2.5mV
28 (muted)
35V
35V
35V
28 (protection off)
1V
1V
1V
29
N/A
5V
5V
30
N/A
10.5
10.5V
31
(volume going up)
N/A
0V
0V
31
(volume going down)
N/A
5V
5V
32
(volume going up)
N/A
0V
0V
32
(volume going down)
N/A
5V
5V
PARTS LISTS
The parts for all the units are as the Alpha 7 except where shown.
REF
Description
Part No
Product
C1
ELST 100U 100V
2N710B
7R
C2
PEST 47N 63V 10%
2K347
7R
C3
PCRB 100N 100V 5% RA
5mm
2H410
7R
C4
PEST 47N 63V 10%
2K347
7R
C5
PSTY 33P 160V ENCAP
1PF%
2F033
7R
C7
PPRO 4N7 63V 5% RA
2D247N
7R
C8
PPRO 100P 63V 5% RA
2D110N
7R
C9
ELST 100U 25V
2N710
A1
C10
ELST 22U 20V OSCON
2P622
7R
C10
ELST 22U 63V ELECT
2N622
A1
C11
ELST 100U 100V
2N710B
7R
C12
ELST 100U 100V
2N710B
7R
C13
PEST 15N 63V 10%
2K315
7R
C14
PEST 15N 63V 10%
2K315
7R
C15
SUPPR CAP 4N7 250V
2K247
7R
C16
ELST 100U 25V
2N710
7R
C17
CERD 470P 63V 20% RA
2A147
7R
C18
CERD 1N0 63V 20% RA
2A210
7R
C19
ELST 100U 25V
2N710
7R
C20
CERD 470P 63V 20% RA
2A147
7R
C21
CERD 10N 63V 20% RA
2A310
7R
C22
CERD 10N 63V 20% RA
2A310
7R
C23
SUPPR CAP 4N7 250V
2K247
7R
C24
PPRO 4N7 63V 5% RA
2D247N
7R
C25
PCRB 100N 100V 5% RA
5mm
2H410
7R
C26
PCRB 100N 100V 5% RA
5mm
2H410
7R
C27
ELST 220U 16V
2N722
7R
C28
PCRB 100N 100V 5% RA
5mm
2H410
7R