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