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
4
3
Product
Date:
Rev:
YsType: YS1067,4
M1294V200SCH.SCH2006
M1294
Effects/Master
Thu May 24, 2012
2.00
YCS50/90 Preamp
GND
GND
GND
GND
+15V
GND
+15V
GND
IG
GND
+15V
GND
+15V
A
B
C
IG
GND
+15V
IG
+15V
GND
-15V
GND
GND
1/
4W
470K
R96
.
R78
1/
4W 3K9
.
GND
-15V
GND
IG
D
R98
1/
4W 4K7
.
-15V
NET00086
NET00085
+15V
LVGND
NET00246
NET00280
NET00273
GND
GND
NET00089
TO_PRE-OUT
NET00141
C39
50V
22U
C122
50V
2N2
R249
1/4W
MINI
10K0
C118
50V
2N2
C126
63V
2U2
C36
100V
100P
W21:G
8
W21:F
8
SPLIT_IN
-15V
R49
1/4W
MINI
620R
GND
-FDBK
-FDBK
IG
SPLITTER
PGRID
C50
63V
100N
R95
1/4W
.
4K7
C7
100V
3N3
LVGND
-15V
R97
1/4W
.
15K
R121
1/4W
.
15K
-Plate
+Plate
XF_P1
W21:E
8
GND
GND
R107
1/4W
.
10K
+15V
NET00132
C117
63V
100N
C114
63V
100N
R246
1/4W
MINI
620R
NET00258
-15V
NET00236
NET00067
GND
GND
R99
1/
4W 33K
.
C120
63V
100N
R256
1/
4W 6K8
.
C123
50V
2N2
R254
1/4W
MINI
10K0
TO_PRE-OUT
C42
50V
22U
C14
50V
22U
LD3
RED
6398
Power
LD5
YEL
6399
St
andby
C51
63V
330N
R100
1/
4W 33K
.
-15V
8
V+
4
V-
U10:C
R247
1/4W
MINI
620R
R248
1/4W
MINI
10K0
LVGND
S7:
B
3522
UP
Alternate
DOWN
STANDBY
+15V
R55
1/4W
.
10K
R51
1/4W
.
10K
-15V
SPLIT_IN
6
W21_:F 8
1N5242B
12V0
D12
0W5
4148
D5
Q2
5104
TO92
MPSA56
Q1
5103
TO92
MPSA06
R3
1/4W
.
470R
R2
1/
4W 47R
.
S
T
R
-
-
-
J3
EFF.SEND
R76X
1/
4W 1M
.
R74X
1/4W
.
470R
Splitter
8
W21_:H
8
6541
J9
RevSend
6541
J10
RevRet
W11
IG
#16
GRN
C127
200V
220P
NGRID
R71X
1/
4W 100K
.
GND
C12
50V
22U
C8
50V
22U
R4
1/
4W 100K
.
C41
63V
150N
R101
1/4W
.
4K7
C46
63V
2U2
U3:A
TL072
C35
100V
220P
R89
1/4W
.
24K
C34
100V
220P
R88
1/4W
.
24K
C61
16V
33U
R102
1/4W
.
4K7
C56
100V
680P
C91
16V
33U
GND
C94
16V
33U
5
W21_:E 8
C60
16V
33U
R117
1/4W
.
4K7
GND
4148
D6
M
15A
P15:A
4423
20K
REVERB1
3682
W19
GND
BLK
3682
W17
4 OHM
GRN
3424
S9:B
4ohm/8ohm
3682
W18
8 OHM
YEL
U8:B
TL072
R106
1/4W
.
10K
C58
100V
220P
R112
1/
4W 47R
.
Q17
5104
TO92
MPSA56
-15V
Q18
5103
TO92
MPSA06
W7
HDPHN
#18
RED
4148
D7
W35
SPKR
#18
YEL
C15
50V
22U
C16
50V
22U
R153
1/4W
.
220R
R154
1/4W
.
220R
4148
D8
W33
GND
#18
BLK
4148
D9
C119
63V
100N
C115
63V
100N
C121
63V
100N
R253
1/
4W 10K0
MINI
4148
D3
R54
1.
0W
Min
i
1K
R257
1/
4W 6K8
.
C97
50V
2N2
R252
1/4W
MINI
10K0
P12:A
4417
M
5B LIN
10K
Send Level
R56
1/4W
.
10K
R50
1/4W
MINI
620R
R155
1/
4W 100K
.
R91
1/
4W 22R
.
R1
1/
4W 47R
.
R75X
1/
4W 1M
.
W12
HeadPhGnd
#16
GRN
R73X
1/
4W 82K
.
C54
100V
68N
S10:
B
3522
UP
Alternate
DOWN
Voice
S10:
A
3522
UP
Alternate
DOWN
Voice
C59
16V
33U
U8:A
TL072
8
V+
4
V-
U8:C
M
15A
P17:A
4423
20K
REVERB2
C57
100V
220P
1/
4W
47R
R111
.
R110
1/4W
.
470R
1/
4W
220K
R7
.
W35_
SPKR
#18
YEL
W33_
GND
#18
BLK
Q11
5119
TO92
2N5638
_W3
M
15A
P18:A
4423
20K
FX Ret 2
STANDBY
W21:C
8
R120
1/4W
.
2K2
TO_HPHN
C125
100V
15N
C40
50V
22U
C40X
63V
100N
TO_HPHN
C53
16V
33U
XF-OUT-CT
R109
1/4W
.
10K
XF_P1
C92
16V
33U
C93
16V
33U
S7:
A
3522
UP
Alternate
DOWN
STANDBY
R59
2.
0W 220K
10MM
C52
63V
330N
R255
1/4W
MINI
10K0
U10:A
TL072
R79
1/4W
.
220K
C38
63V
100N
R251
1/4W
MINI
10K0
R250
1/4W
MINI
10K0
U10:B
TL072
C31
100V
220P
C32
100V
220P
R86
1/4W
.
47K
R77X
1/4W
.
10K
C37
16V
33U
C39X
100V
10N
W21:H
8
C128
400V
2N2
R92
1/4W
.
2K2
U7:A
TL072
D4
4148
R93
1/4W
.
150R
R57
1/4W
.
10K
R58
1/4W
.
10K
1/
4W
100K
R5
.
S
T
R
J4
-
-
-
EFF.RETURN
C19
50V
22U
P14:A
4423
M
15A
20K
Presence
R16
1/4W
.
2M2
R6
1/4W
82K
.
3424
S9:A
4ohm/8ohm
R104
1/4W
MINI
620R
R105
1/4W
MINI
620R
C55
100V
3N3
R103
1/4W
.
4K7
R108
1/4W
.
10K
R118
1/4W
.
10K
W7_
HDPHN
#18
RED
C49
100V
100P
U7:B
TL072
R94
1/4W
.
24K
R90
1/4W
.
10K
R122
1/4W
.
10K
R8
1/4W
.
220K
3923
LINE.OUT
J8
U2:B
TL072
C124
100V
15N
C33
16V
33U
8
V+
4
V-
U3:C
R87
1/4W
.
47K
U3:B
TL072
R80
1/4W
.
220K
R10
1/
4W 1K
.
7
W21_:G 8
{Body}
V3:A
Val
2X_TRIODE_HCT
.
V3:B
2X_TRIODE_HCT
{Body}
Val
.
8
V+
4
V-
U7:C
C17
50V
22U
W12_
HeadPhGnd
#16
GRN
8
V+
4
V-
U2:C
U2:A
TL072
6
4
5
1
2
3
XF1
{Hz}
{Description}
Part#
Q8
5119
TO92
2N5638
Q9
5119
TO92
2N5638
M
15A
P13:A
4423
20K
FX Ret 1
S
T
R
-
-
-
J13
EXT SPEAKER
S
T
R
-
-
-
J14
INT SPEAKER
4425
P10:A
M
500K
15A
Resonance
M
4423
P11:A
20K
15A
MASTER VOLUME
These parts are
not stuffed.
D11
1N5242B
12V0
0W5
_W4
U1:A
TL072
Q10
5119
TO92
2N5638
RING
J5
Headphone
S
T
R
J11
Gold
Gold
Gold
AMP-IN
S
T
R
J12
-
-
-
PRE-OUT
Summary of Contents for YCS50
Page 8: ......