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
2
1
Product
Date:
Rev:
YsType:YsType
M1301V03sch.sch2002
M1301
Wed Oct 12, 2011
PRE-AMP
02
YBA300
of
Filename:
PCB#
Sheet
2
1
Product
Date:
Rev:
YsType:YsType
M1301V03sch.sch2002
M1301
Wed Oct 12, 2011
PRE-AMP
02
YBA300
IG
IG
GND
FDBK-
GND
2R
GND
+12V
-12V
+12V
GND
R17
1/
4W
1K54
.
GND
4R
2R
GND
R40
1/
4W
47K
.
-12V
+12V
R39
1/
4W
6K2
.
-12V
GND
R63
1/
2W
18R
.
R64
1/
2W
18R
.
R65
1/
2W
18R
.
BR
ITE
+
12V
-12V
NET00101
PSGND
PSGND
5
6
W7:E
NET00074
NET00030
3
6
W7:C
STANDBY
1
6
W7:A
C33
63V
100N
2
W2_:B
2
#3056 Cable
1
2
W2:A
GND
V1A_PL
C19
100V
22N
C18
100V
22N
C16
400V
2N2
GAIN
5
6
W11:E
3
6
W11:C
1
6
W11:A
5
W10:E
6
3
W10:C
6
1
W10:A
6
-Screen
C2
100V
3N3
8
W1:H
8
6
W1:F
8
5
W1:E
8
3
W1:C
8
1
W1:A
8
3
W5:C
4
1
W5:A
4
8R
C37
250V
330N
+12V
C7
63V
330N
R74
1/4W
.
20K
DI-PRE
C11
63V
330N
-12V
+12V
DI_+
6
12
W8_:F
9
12
W8_:I
4
12
W8_:D
1
12
W8_:A
RNG_IN
GND
6
W8:F
12
9
W8:I
12
4
W8:D
12
1
W8:A
12
4
6
W7:D
6
6
W7:F
2
6
W7:B
GND
1
W2_:A
2
2
2
W2:B
1
4
5
3
2
RING
J10
L
O
INP
U
T
1
4
5
3
2
RING
J9
HI INP
U
T
5
4
9
2X_TRIODE_HCT
V3:C
12.6V
R26
1/4W
.
20K
R62
1/
4W
4K7
.
T
B
4424
P6:A
M
100K
1B
MASTER
R16
1/
4W
1K54
.
R19
1/
4W
113K
.
R2
1/
4W
113K
.
W3
GRN
CHASSIS GND
R31
1/
4W
1M
.
GND
R30
1/
4W
1M
.
GND
In
Com
Out
S6:B
3436
RESONANCE .
R76
1/4W
.
47K
R75
1/4W
.
47K
R4
1/
4W
100K
.
PREOUT
R22
1/
4W
91K
.
R20
1/4W
.
150K
5
4
9
2X_TRIODE_HCT
V6:C
12.6V
R25
1/
4W
1K
.
R24
1/
4W
1K
.
6
6
W11:F
2
6
W11:B
4
6
W11:D
R29
2.
0W
220K
10MM
R28
2.
0W
220K
10MM
FDBK+
R11
1/
4W
1M
.
R3
1/
4W
113K
.
6
W10:F
6
2
W10:B
6
4
W10:D
6
LD4
Operate
RED
6398
PSGND
To M1297
Power PCB
R18
1/
4W
113K
.
C6
250V
220N
+Plate
B+
+Screen
-Plate
R1
1/
4W
47K
.
C26
100N
63V
7
W1:G
8
4
W1:D
8
FIL-
2
W1:B
8
2
3
4
1
4096
GND
R68
5.0W
.
390R
R69
5.0W
.
390R
R32
1/4W
.
10K
R70
1/4W
.
10K
C4
250V
4N7
C12
63V
100N
R23
1/4W
.
390K
63V
C25
100N
LVGND
4
W5:D
4
2
W5:B
4
8R
R78
2.0W
.
3R9
-12V
1
2
-
3
+
U2:A
MC33078P
C21
100V
10N
R77
1/4W
MINI
133K
R35
1/4W
MINI
82K
GND
C9
100V
15N
R14
1/
4W
10K
.
In
Com
Out
S4:B
3436
.
DI Pre/Post
8
V+
4
V-
U5:C
C10
250V
4N7
T
B
4466
P4:A
D
100K
5C R/A
Frequency
T
B
D
4466
P4:B
100K
5C R/A
Frequency
R38
1/
4W
75K
.
8
V+
4
V-
U1:C
R47
1/4W
.
20K
C36
100V
330P
R46
1/4W
.
1K
8
V+
4
V-
U4:C
R41
1/4W
.
20K
C29
50V
22U
D1
4148
AMP_OUT
C23
50V
22U
R45
1/8W
FLMP
681R
C24
50V
22U
C27
50V
22U
11
12
W8_:K
10
12
W8_:J
12
12
W8_:L
5
12
W8_:E
7
12
W8_:G
8
12
W8_:H
2
12
W8_:B
3
12
W8_:C
R61
1/
4W
20K
.
R53
1/4W
.
220K
R54
1/4W
.
220K
8
W8:H
12
7
W8:G
12
5
W8:E
12
12
W8:L
12
11
W8:K
12
10
W8:J
12
2
W8:B
12
3
W8:C
12
GND
GND
R55
1/4W
.
2K2
IG
1/
4W
47K
R73
.
8
V+
4
V-
U3:C
R27
1/
4W
20K
.
In
Com
Out
S6:A
3436
.
RESONANCE
400V
C15
2N2
C28
16V
33U
R67
1/4W
.
470K
R66
1/
2W
18R
.
2
3
1
9pin
V5:A
12AX7
2X_TRIODE_HCT
Splitter
7
8
6
V5:B
2X_TRIODE_HCT
9pin
12AX7
Splitter
T
B
P3:A
4425
M
15A
500K
Gain
C34
200V
220P
LD5
Standby
YEL
6399
5
4
2
1
3
4163-
PLUG
V2
B_
K
PSGND
R12
1/4W
.
10K
X31
X32
8
V+
4
V-
U2:C
R8
1/4W
.
4K7
T
B
P5:A
4424
M
1B
100K
MID
In
Com
Out
S4:A
.
DI Pre/Post
3436
R49
1/4W
.
20K
R42
1/8W
FLMP
681R
C35
100V
330P
R60
1/
4W
20K
.
R71
1/
4W
4K7
.
C30
50V
22U
5
W7_:E
6
3
W7_:C
6
1
W7_:A
6
C32
16V
100U
C31
16V
100U
C17
400V
2N2
PREOUT
GND
FDBK-
NGRID
+225V
SPLITTER
LOW+
STANDBY
BRN/YEL
BLU
C1
100V
18N
DI_-
C8
63V
330N
+12V
-12V
FDBK-
GND
GND
AMP_OUT
RNG_IN
6
W7_:F
6
4
W7_:D
6
2
W7_:B
6
5
4
9
2X_TRIODE_HCT
V4:C
12.6V
5
4
9
2X_TRIODE_HCT
V5:C
12.6V
7
6
-
5
+
U3:B
MC33078P
R57
1/4W
.
220R
100N
C39
63V
RAD .2in
1
2
-
3
+
U3:A
MC33078P
R58
1/4W
MINI
1K0
R13
1/
4W
1M
.
C13
100V
10N
400V
C14
1N
C5
250V
220N
In
Com
Out
S1:A
3436
{FunctionR}
DEEP
2
3
1
V3:A
2X_TRIODE_HCT
9pin
12AX7
Pre-amp
GAIN
In
Com
Out
S2:B
3436
{FunctionR}
BRITE
R5
1/4W
.
220K
R21
1/4W
.
150K
FDBK+
BRITE
PSGND
PGRID
TO M1297
POWER AMP PCB
R52
1.0W
Mini
1K
LVGND
R34
2.
0W
36K
.
BLU/YEL
BRN
RED
4
W16:D 4
1
W16:A 4
3
W16:C 4
2
W16:B 4
R33
2.
0W
36K
.
R36
2.
0W
36K
.
C38
63V
100N
RAD .2in
T
B
4425
P2:A
M
500K
15A
Treble
R9
1/4W
.
4K7
2+
2_
6956
SPEAKON 4C H
SPEAKER OUT
J8:B
R44
1/8W
FLMP
681R
R48
1/4W
.
20K
1
2
-
3
+
U1:A
MC33078P
2
6
1
3
5
4
S
T
R
J6
-
-
-
Speaker Out
L
C
R
S5:A
3424
4 Ohm
2 Ohm
L
C
R
4 Ohm
S5:B
3424
2 Ohm
1
2
-
3
+
U5:A
MC33078P
7
6
-
5
+
U4:B
MC33078P
R7
1/4W
.
6K8
TIP_IN
C20
50V
22U
In
Com
Out
S3:B
{FunctionR}
GND LIFT
3436
FDBK+
DI-PRE
TIP_IN
R43
1/8W
FLMP
681R
R51
1/4W
.
220R
In
Com
Out
S1:B
3436
{FunctionR}
DEEP
In
Com
Out
S2:A
3436
{FunctionR}
BRITE
R72
1/
4W
47K
.
7
8
6
V3:B
2X_TRIODE_HCT
9pin
12AX7
Pre-amp
NC
COM
NO
6544
S7:A
UP
DOWN
250TAB
{Function}
BLU
BLU/YEL
RED
BRN/YEL
BRN
1411M
GRN
YEL
WHT
BLK
1411M
R37
2.
0W
36K
.
2
3
1
V6:A
2X_TRIODE_HCT
9pin
12AU7
Driver
7
8
6
9pin
V6:B
12AU7
2X_TRIODE_HCT
Driver
C3
400V
2N2
R10
1/4W
.
100K
C22
63V
220N
7
8
6
V4:B
2X_TRIODE_HCT
9pin
12AX7
Pre-amp
T
B
M
4425
P1:A
500K
15A
Bass
R50
1/4W
.
20K
2
6
1
3
5
4
S
T
R
J7
-
-
-
Speaker Out
7
6
-
5
+
U5:B
MC33078P
7
6
-
5
+
U1:B
MC33078P
R6
1/4W
.
6K8
1
2
-
3
+
U4:A
MC33078P
R59
1/4W
.
20K
3923
J4
D.I. OUT
2
6
1
3
5
4
S
T
R
J5
-
-
-
TUNER OUT
In
Com
Out
S3:A
3436
{FunctionR}
GND LIFT
1+
1_
6956
J8:A
SPEAKON 4C H
SPEAKER OUT
TO POWER
SUPPLY PCB
2
3
1
V4:A
2X_TRIODE_HCT
9pin
12AX7
Pre-amp
7
6
-
5
+
U2:B
MC33078P
NC
COM
NO
UP
DOWN
6544
S7:B
250TAB
{Function}
2
6
1
3
5
4
S
T
R
J2
Gold Gold Gold
AMP IN
2
6
1
3
5
4
S
T
R
J3
-
-
-
PRE-AMP OUT
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