10
L5 PREAMP
Schematic (2/2)
POWER SUPPLY
+V
-V
LM
781
5
LM
791
5
100
n
G
N
D
100u/35
v
100u/35
v
220u/35
v
220u/35
v
22u
F/25
v
100
n
100
n
22u
F/25
v
-V
+V
220u/35
v
220u/35
v
8
4
8
4
8
4
8
4
8
4
8
4
R
G
1
GN
D
V
I
V
O
R
G
2
GN
D
V
I
V
O
D6
D
7
D
8
D9
D
10
D
11
9V
AC
C
50
C
51
C
52
C
53
C
55
C
59
C
57
C
58
C
60
C
56
C
54
AC
+
AC
-
TE
ST
+
TE
ST
-
TE
ST
G
DX1
DX2
To
s
ta
r g
roun
d
or
b
ypa
ss
switch
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
-V
5M
M
680R
1/2
W
5M
M
1M
1M
+V
680R
1/2
W
G
N
D
G
N
D
5M
M
1M
CH
1
RX6
CH
2
C
H
C
H
RX7
RX8
RX5
SW
SW
3
SW
4A
SW
4B
SW
4C
SW
5A
SW
5B
SW
5C
4B
5B
6B
8B
O
U
T
O
U
T
JA
C
K
SW
IN
JA
C
K
IN
G
N
D
.2
BY
P
C
H
_A
LT
RX9
OFFBOARD SWITCHES
25kA
50kC
2u7 tant
.
RC
4558
P
10k
G
N
D
15k
10n
6k8
33k
G
N
D
C
A308
0
1k
G
N
D
470
k
220
R
10
k
20k
220p
F
G
N
D
+V
10
n
G
N
D
2N
508
8
2N
508
8
3k3
2k
47k
-V
330R
10
n
G
N
D
330
n
G
N
D
100
k
68n
2N
545
7
+V
C
A308
0
6k8
15
k
+V
10
M
G
N
D
820R
100p
F
220R
220R
G
N
D
G
N
D
-V
-V
2u2
2k
7
1/2
W
1N
4004
1N
4004
-V
+V
22
k
100
k
M
PSA
13
20k
G
N
D
22k
G
N
D
G
N
D
3k3
P8
55
4
C
R
P8
55
4
C
R
10
k
10
k
33
k
-V
5M
M
2N
3906
-
680R
1/2
W
G
N
D
47k
1N
914
1N
914
G
N
D
10u
F
47k
-V
RC
4558
P
G
N
D
+V
MAS
TER
1
2
3
LEV
EL
1
2
3
C40
2
3
1
IC
9A
R57
R59
C41
R
99
R6
8
1
2
3
6
5
7
4
IC
10
R60
R
70
R
72
R
73
DIS
T
1
2
3
C
34
C
32
Q
X1
Q
X2
R
74
RX1
RX2
R68
C
33
C
35
R
76
C36
Q
1
8
1
2
3
6
5
7
4
IC
11
R84
R
77
R
81
R82
C
37
R79
R78
C38
R
89
O
U
T
D2
D1
R
83
R
96
Q
3
2
3
1
CO
MP
1
2
3
CO
MP
TR
IM
R87
R
88
2
3
1
IC
12
A
6
5
7
IC
12
B
R
91
R
92
R
90
LI
M
IT
Q
2
R95
R93
D4
D5
C
39
R94
6
5
7
IC
9B
TP
1
TP
2
FROM CH1, CH2 & MULTIFILTER
MASTER VOLUME, COMPRESSOR, OUTPUT
