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 11

Product

Date: Rev: YsType:YsType

M1420V03sch.sch2002

M1420

Fri Jul 09, 2010

power amp

V03
DH15H

of

Filename:

PCB# Sheet 11

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
6W8:D
C5 100V10N
2W15:B3

YS# 1331

C8 400V22N

396Vdc

C28 400V22N
8
8W20_:H

388Vdc 351Vdc 288Vdc

C1 63V100U
R37
5.0W
.
910R
4
6W12_:D

27.2Vdc

6
8W20:F
D6
4007
BRN
RED
BLU
3W11:C3
GRY 1W11:A3
IEC_RECT W4
IGND
GRN
16AWG
2W8:B6
R29
1/4W
1M
.
C17 63V100N
3
6W8:C
C4 63V100N
R14
1/4W
.
10K
W9_:A 2
W9_:B 2
1W10:A2
3W15:C3
1W15:A3
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 400V22N
R8
1/4W
100K
.
C24
100V
220P
7
8W20_:G
R25
2.0W
.
2K2

360Vdc

R36
1/4W
.
1K54
R382.0W
.
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

2W12:B6
R32
5.0W
.
910R
C12
250V
4N7
6
6W12_:F
5W12_:E6
3W12_:C6

6V6 MODE

5
8W20:E
R15
1/4W
1M
.
S5:B
STANDBY
23 W17:B
C6
50V
22U
R19
1/4W
1K54
.
R17
1/4W
100K
.
C20 400V2N2
R21
1/4W
21K5
.
1W12_:A6
LD3
GRN
6396
TRIODE
D7
MBR160
MBR160
D8
2W11:B3
2
8W20_:B
R3
1/4W
.
8K2
3
8W20_:C
R49
1/4W
.
47K
R48
1/4W
.
33K
C26 400V2N2
R47
1/4W
.
100K
C27 100V10N
1
8W20:A

North America

Fuse: T1A C19
250V
4N7
XF_P1
XF_P2
XF_PTAP
1
6W8:A
6
6W8:F
.
V3:B
12AX7
.
2W10:B2
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

8W20:H8
4W12:D6

18.7Vdc

4
8W20_:D 4W20:D8
6W20_:F8
C9 50V470P
R24
1/4W
.
100K
C11 250V4N7
C21 400V1N
GRN
R31
1/4W
100R
.
C18
275V
22N
S1
POWER

6V6 MODE

C2 400V22N
R11
1/4W
1M
.
7W20:G8W9:A2
Chassis
W1GRN
R28
1/4W
FLMP
2K21
W9:B2
5
6W12:E
3
6W12:C
6W12:F6
V1:B
PENTODE
LD2
YEL
6399
STBY
R26
1.0W
.
10K0
1W12:A6
R6
1/4W
.
1K54 R1
1.0W
FLMP
220R
V5:A
12AU7
TRIODE
PENTODE
V1:A
6V6
.
.
R5
1/4W
.
1K54

12AU7 MODE

5W20_:E8
C10 100V10N
R22
1/4W
.
33K
1/4W
100K
R34
.
S2:B
DPDT MINI SW PCMT V TOG ON-ON-ON
US/PURE/UK
2W12_:B6
C25 16V100U
LD1
RED
6398
PENT

YS# 1331M

3W17:C3
1W17:A3
2W20:B8
4430
P2:B
D
100K
4B
Bass
C23
100V
10N
4430
P1:B
D
100K
4B
Treble
3W20:C8
1W20_:A8
C3 400V22N
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. RouteDEC 09 v100p3

RING
J1
Input