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
3
1
Product
Date:
Rev:
YsType: YsType
M1423V03sch.sch2006
M1423
Tue Feb 28, 2012
power amp
V03
IronHorse (DH40H)
BLK
GRN
W1
3417
R29
1/
4W 1M
.
R62
1/
4W 1K5
.
6
6
W35:F
4
6
W35:D
2
6
W35:B
12
12
W26:L
10
12
W26:J
8
12
W26:H
6
12
W26:F
4
12
W26:D
2
12
W26:B
6
W35_:F
6
4
W35_:D
6
2
W35_:B
6
12
W26_:L
12
10
W26_:J
12
8
W26_:H
12
6
W26_:F
12
4
W26_:D
12
2
W26_:B
12
3
4
W27_:C
1
4
W27_:A
4148
D19
PURE
R36
1/4W
.
56K
C8
400V
22N
SOLO
C4
63V
100N
TP2
YS# 1331M
BRN
RED
BLU
5
6
W35:E
1
6
W35:A
3
6
W35:C
11
12
W26:K
7
12
W26:G
9
12
W26:I
5
12
W26:E
3
12
W26:C
1
12
W26:A
3
W35_:C
6
1
W35_:A
6
5
W35_:E
6
11
W26_:K
12
9
W26_:I
12
7
W26_:G
12
1
W26_:A
12
3
W26_:C
12
5
W26_:E
12
R49
1/4W
.
68K
R44
1/4W
.
68K
R71
1/
4W 2K2
.
C44
63V
470N
C46
400V
1N
R65
1/
2W 2K
.
Twisted
4
4
W27_:D
2
4
W27_:B
W33
.
BLK
18AWG
R81
1/4W
.
56K
R76
1/
4W 10K
.
4148
D8
C25
100V
47P
R37
1/
4W 1M
.
R35
1/
4W 1K54
.
R16
1/
4W 470K
.
R4
1/
2W 100K
6588
R75
1/
4W 2K2
.
C48
63V
470N
C47
400V
1N
R66
1/
2W 2K
.
V2:B
2X_TRIODE_HCT
{Body}
Val
{Function}
R18
1/
4W 113K
.
4148
D18
P4:A
4424
M
1B
100K
Master
4444
P2:A
M
500K
1B
Bass
M
4444
P3:A
500K
1B
Treble
C12
200V
1N5
R15
1/
4W 1M
.
R19
1/
4W 1K54
.
C6
50V
22U
R21
1/
4W 113K
.
R7
1/
4W 100K
.
C45
63V
10U
R8
1/
4W 100K
.
R41
1/
4W 15K
.
C27
63V
1U
R42
1/
4W 330K
.
LD1
RED
6398
Push-Pull
LD3
GRN
6396
Single-Ended
TP1
C26
160V
10U
R5
1/4W
.
1K54
Q1
5101
TO92
BC550C
R39
1/
4W 15K
.
R72
1/
4W
2K2
.
2W 1R
R1
WIREWND
R25
2.0W
.
1K
2W 1R
R2
WIREWND
R59
1/
4W 1M
.
R46
1/4W
.
680R
Q2
5105
TO92
MPSA13
4148
D17
R61
1/
4W 100K
.
R60
1/
4W 680R
.
R58
1/
4W 1M
.
W34
GRN
18AWG
CHASSIS
S3:B
PURE
R67
1/
4W 47R
.
R74
1/4W
.
56K
W21
.
YEL
18AWG
Q4
5103
TO92
MPSA06
K4:B
3696
C17
100V
47P
R70
1/
4W 2K2
.
R68
1/
4W 47R
.
R79
1/4W
.
56K
R20
1/
4W 1K54
.
P1:A
4425
M
15A
500K
Gain
Q6
5103
TO92
MPSA06
K6:B
3696
R80
1/
4W 2K2
.
R14
1/4W
.
10K
K6:A
3696
R34
1/
4W 220K
.
C23
100V
680P
R13
1/4W
.
820R
R10
1/
4W 100K
.
R11
1/
4W 1M
.
R9
1/
4W 82K
.
R23
1/
4W 100K
.
C32
200V
220P
TP3
R38
1/4W
.
22K
R6
1/4W
.
1K54
R40
1/
4W 15K
.
R50
2.0W
.
1K
2
3
W8:B
4148
D16
3
W8:C
3
1
W8:A
3
S
T
R
Gold Gold Gold
J4
Out
Ribbon to Pots
3
W27:C
4
1
W27:A
4
C29
400V
22N
FIXED MODE
??.?Vdc
C2
400V
22N
R24
1/4W
.
330K
C11
200V
1N5
C21
100V
680P
R48
7.0W
Standoff
750R
3392
W42
FROM_SW
YEL
Ribbon to LEDs/Standby
Master Volume Ribbon
4
W27:D
4
2
W27:B
4
W32
.
BLK
18AWG
C28
50V
22U
C30
400V
22N
K2:B
3696
K2:A
3696
R45
1/4W
.
2K2
R78
1/
4W 10K
.
R77
1/4W
.
1K5
C3
400V
22N
4148
D15
R12
1/
4W 1M
.
{Body}
V3:B
Val
2X_TRIODE_HCT
TRIODE
100V
10N
C5
V3:A
2X_TRIODE_HCT
{Body}
Val
TRIODE
C10
100V
3N3
R22
1/4W
.
100K
C20
400V
2N2
K4:A
3696
S5:A
DPDT TOGGLE SW MINI SLDR TERM
LD2
YEL
6399
Standby
3392
W31
OUT_GND
BLK
R47
7.0W
Standoff
750R
C42
400V
2N2
C40
63V
1U
C39
63V
10U
Q3
5101
TO92
BC550C
W20
.
YEL
18AWG
R32
1/4W
.
1K
V1:A
2X_TRIODE_HCT
{Body}
Val
.
V1:B
2X_TRIODE_HCT
{Body}
Val
.
4148
D14
Q5
5101
TO92
BC550C
R33
1/4W
.
56K
C43
400V
2N2
V2:A
2X_TRIODE_HCT
{Body}
Val
{Function}
UP: Push-Pull (Full Power)
MID: STANDBY
DOWN: Cathode Bias (Low Power)
6
4
5
1
2
3
XF4
{Hz}
{Description}
Part#
S5:B
PENTODE
{Body}
V5:A
Val
.
C38
63V
100N
S
T
R
Gold Gold Gold
J2
Preamp Out
PENTODE
V4:A
{Body}
Val
.
S
T
R
Gold Gold Gold
J3
Out
To 3429 Rocker Switch
S
T
R
J6
Gold
Gold
Gold
Foot
swi
tch
S3:A
PURE
RING
J1
Input
Hi
RING
J7
Input
Lo
S
T
R
Gold
Gold
Gold
J5
Poweramp In
