1
2
3
4
5
6
7
8
A
B
C
D
8
7
6
5
4
3
2
1
D
C
B
A
ISSUE
DRAWING NO.
23425
DRAWING TITLE
Drawn by:
DATE
Filename
ECO No.
DESCRIPTION OF CHANGE
J:\FILES\Products\A1_7_8_8P AMPS\Issue_2\L846C3_3.SCH
A & R Cambridge Ltd.
Pembroke Avenue
Denny Industrial Centre
Waterbeach
Cambridge CB5 9PB
ALPHA 1, 7, 8 & 8P AMP
Circuit Diagram
L846C3_2
LJW
22-Sep-1998
INITIALS
Date Printed
3
7
Sheet
of
Notes:
1
2
3
SW301A
2PCO
4
5
6
SW301B
2PCO
1
2
LK701
10MM LINK
1
2
LK702
10MM LINK
3
2
1
Z305A
NE5532
C701
100P PP
R701
47K MF
R702
470R MF
C702
47P CD
+
C703
22U EL
R703
680K MF
R704
56K MF
C704
4N7 PP
C705
1N3 PP
R705
820R MF
+
C706
10U EL
1
2
LK601
10MM LINK
1
2
LK602
10MM LINK
C601
100P PP
R601
47K MF
R602
470R MF
C602
47P CD
+
C603
22U EL
R603
680K MF
R604
56K MF
C604
4N7 PP
C605
1N3 PP
R605
820R MF
+
C606
10U EL
1
2
3
SW302A
4PCO
4
5
6
SW302B
4PCO
7
8
9
SW302C
4PCO
10
11
12
SW302D
4PCO
5
6
7
Z305B
NE5532
C301
10N CD
C302
10N CD
N15V
P15V
PHINE
VCRL
TUNL
COL
AVL
VCRR
TUNR
COR
AVR
TAPR
TAPL
SIGE
R401
1K8 MF
R501
1K8 MF
R402
47K MF
R502
47K MF
RV301A
20K LOG POT
RV301B
20K LOG POT
VCR
TUNER
CD
AV/DVD
TAPE IN
TAPE OUT
PREAMP OUT
8P - PWR IN
8P - LINK
1
2
LK804
10MM LINK
1
2
LK803
10MM LINK
8P ONLY
8P ONLY
Key to component numbers:
0xx Power amp L
1xx Power amp R
2xx Power supply
3xx ICs / Switches
4xx Tone / balance L
5xx Tone / balance R
6xx MM phono L
7xx MM phono R
8xx Pre amp output L&R
9xx Remote control
EMC
1
N
F
SK301A
PHONO4G
N
F
SK301B
PHONO4G
EMC
1
N
F
SK302A
PHONO4G
N
F
SK302B
PHONO4G
EMC
1
N
F
SK303A
PHONO4G
N
F
SK303B
PHONO4G
EMC
1
N
F
SK304A
PHONO4G
N
F
SK304B
PHONO4G
C303
1N0 CD
C304
1N0 CD
TAPEOL
TAPEOR
PREOR
PREOL
PHINR
PHINL
1
2
3
4
5
6
7
8
LK901A
L809CA
8
4
Z305C
NE5532
TP7
TP8
R505
4K7 MF
R405
4K7 MF
C305
47P CD
C306
47P CD
LK8
MINI_LK
FITTED BY HAND
ON ALPHA 1 AMP ONLY
LK9
MINI_LK
ON ALPHA 1 AMP ONLY
FITTED BY HAND
1
LJW
LJW
98_1025
12-05-98
1
2
3
4
5
6
SW305A
ROTARY4H
12
11
10
9
8
7
SW305B
ROTARY4H
13
14
15
16
17
18
SW305C
ROTARY4H
RLY2A
RLY 51SB12T
RLY2B
RLY 51SB12T
RLY2C
RLY 51SB12T
R44
68K MF
R55
22K MF
R57
2K7 1W CF
+
C29
1U0 EL
D6
1N4003F
+37V
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
PL1
DIL16 VPLG
1
2
LK10
10MM LINK
1
2
LK11
10MM LINK
R54
68K MF
R56
22K MF
24
23
22
21
20
19
SW305D
ROTARY4H
R43
22K MF
D10
5V6 400MW
1
2
LK15
10MM LINK
1
2
LK16
10MM LINK
PHONO & INPUTS
1
2
3
6
5
4
SW1
SLIDE2H
LK19B TO LK19A ON MAIN BOARD
LK19A TO SNAP OFF BOARD FOR SLIDER SWITCH
1
2
LK19B
L835CA
1
2
LK19A
L835CA
SLIDER SWITCH FOR AV
R59
2K2 MF
R60
2K2 MF
CUT WHEN CIM FITTED
CUT WHEN CIM FITTED
VOLL
VOLR
Initial release
2
PREOUTR
PREOUTL
98_1029
29-05-98
LISTENING APPROVAL
MCLR