11
11
10
10
9
9
8
8
7
7
6
6
5
5
4
4
3
3
2
2
1
1
A
A
B
B
C
C
D
D
E
E
F
F
G
G
H
H
I
I
J
J
K
K
L
L
M
M
N
N
O
O
P
P
Q
Q
of
Filename:
PCB#
Sheet
1
1
Product
Date:
Rev:
YsType:YsType
M1420V03sch.sch2002
M1420
Fri Jul 09, 2010
power amp
V03
DH15H
of
Filename:
PCB#
Sheet
1
1
Product
Date:
Rev:
YsType:YsType
M1420V03sch.sch2002
M1420
Fri Jul 09, 2010
power amp
V03
DH15H
R9
1/
4W 82K
.
BLK
R12
1/
4W 1M
.
R40
1/
2W 47R
.
R41
1/
4W 33R
.
R42
1/
4W 10R
.
R46
1/
4W 33K
.
4
6
W8:D
C5
100V
10N
2
W15:B
3
YS# 1331
C8
400V
22N
396Vdc
C28
400V
22N
8
8
W20_:H
388Vdc
351Vdc
288Vdc
C1
63V
100U
R37
5.0W
.
910R
4
6
W12_:D
27.2Vdc
6
8
W20:F
D6
4007
BRN
RED
BLU
3
W11:C
3
GRY
1
W11:A
3
IEC_RECT
W4
IGND
GRN
16AWG
2
W8:B
6
R29
1/
4W 1M
.
C17
63V
100N
3
6
W8:C
C4
63V
100N
R14
1/4W
.
10K
W9_:A 2
W9_:B 2
1
W10:A
2
3
W15:C
3
1
W15:A
3
R10
1/
4W 100K
.
R13
1/4W
.
820R
C7
50V
22U
R20
1/
4W 1K54
.
R18
1/
4W 113K
.
D2
4007
4007
D4
370Vdc
D1
4007
C29
400V
22N
R8
1/
4W 100K
.
C24
100V
220P
7
8
W20_:G
R25
2.0W
.
2K2
360Vdc
R36
1/4W
.
1K54
R38
2.0W
.
1K8
R35
1/4W
.
1K54
4430
P2:A
D
100K
4B
Bass
4430
P1:A
D
100K
4B
Treble
V2:B
PENTODE
W14
GND
YEL/GRN
R27
1.0W
.
39K
327Vdc
269Vdc
2
W12:B
6
R32
5.0W
.
910R
C12
250V
4N7
6
6
W12_:F
5
W12_:E
6
3
W12_:C
6
6V6 MODE
5
8
W20:E
R15
1/
4W 1M
.
S5:B
STANDBY
2
3
W
17:
B
C6
50V
22U
R19
1/
4W 1K54
.
R17
1/
4W 100K
.
C20
400V
2N2
R21
1/
4W 21K5
.
1
W12_:A
6
LD3
GRN
6396
TRIODE
D7
MBR160
MBR160
D8
2
W11:B
3
2
8
W20_:B
R3
1/4W
.
8K2
3
8
W20_:C
R49
1/4W
.
47K
R48
1/4W
.
33K
C26
400V
2N2
R47
1/4W
.
100K
C27
100V
10N
1
8
W20:A
North America
Fuse: T1A
C19
250V
4N7
XF_P1
XF_P2
XF_PTAP
1
6
W8:A
6
6
W8:F
.
V3:B
12AX7
.
2
W10:B
2
4007
D3
R7
1/
4W 100K
.
2X_TRIODE_HCT
V4:C
P6:A
4425
M
15A
500K
Gain
C14
450V
10U
C22
450V
22U
2X_TRIODE_HCT
V5:C
C15
450V
22U
R23
1/
4W 33K
.
V4:B
12AX7
.
.
R45
1/4W
.
56K
V3:A
12AX7
.
.
CE
12AU7 MODE
8
W20:H
8
4
W12:D
6
18.7Vdc
4
8
W20_:D
4
W20:D
8
6
W20_:F
8
C9
50V
470P
R24
1/4W
.
100K
C11
250V
4N7
C21
400V
1N
GRN
R31
1/
4W 100R
.
C18
275V
22N
S1
POWER
6V6 MODE
C2
400V
22N
R11
1/
4W 1M
.
7
W20:G
8
W9:A
2
Chassis
W1
GRN
R28
1/4W
FLMP
2K21
W9:B
2
5
6
W12:E
3
6
W12:C
6
W12:F
6
V1:B
PENTODE
LD2
YEL
6399
STBY
R26
1.0W
.
10K0
1
W12:A
6
R6
1/4W
.
1K54
R1
1.0W
FLMP
220R
V5:A
12AU7
TRIODE
PENTODE
V1:A
6V6
.
.
R5
1/4W
.
1K54
12AU7 MODE
5
W20_:E
8
C10
100V
10N
R22
1/4W
.
33K
1/
4W
100K
R34
.
S2:B
DPDT MINI SW PCMT V TOG ON-ON-ON
US/PURE/UK
2
W12_:B
6
C25
16V
100U
LD1
RED
6398
PENT
YS# 1331M
3
W17:C
3
1
W17:A
3
2
W20:B
8
4430
P2:B
D
100K
4B
Bass
C23
100V
10N
4430
P1:B
D
100K
4B
Treble
3
W20:C
8
1
W20_:A
8
C3
400V
22N
R30
1/
4W 100R
.
V4:A
.
12AX7
.
C16
350V
22U
C13
450V
22U
R39
1/
4W 1M
.
2X_TRIODE_HCT
V3:C
R2
1.0W
FLMP
220R
R33
1/4W
.
56K
R16
1/
4W 1M
.
S2:A
DPDT MINI SW PCMT V TOG ON-ON-ON
US/PURE/UK
PENTODE
V2:A
6V6
.
.
V5:B
12AU7
TRIODE
SLEEVE
J4
3924
8 ohm
1/4in JCK
SLEEVE
J2
3924
16 ohm
1/4in JCK
P7:A
4425
M
15A
500K
Volume
XF_P2
XF_P1
XF2
SLEEVE
J3
3924
8 ohm
1/4in JCK
6
4
5
1
2
3
XF4
1331M
Output XFMR
S5:A
STANDBY
13
10
7
4
1
9
11
12
8
#
2
3
5
6
VER#
MODEL(S):-
DATE
DESCRIPTION OF CHANGE
V
V
V03
2V00
V
V
V
V
V03P0
.
.
v100
D
D
09-JUL-2010
04-MAR-2010
N
N
Added alternate patern for #5973 GG
PC8031: Remove W10 green GND wire GG
DARK HORSE
D
D
D
D
03-JUN-2010
09-MAR-2010
.
Feb 2010
N
N
N
N
Added connectors to transformers GG
PC8034: Change #2335 to #3865. Add test nodes GG
M1420
Replaced PURE switch with DPDT ON-ON-ON, used
stereo pots in tone stack for switchable placement
Value Changes, Repl Middle score w. Route
DEC 09
v100p3
RING
J1
Input
