active
passive
4k7
SWR RED HEAD PREAMP
TL072
GAIN
*
100k/A
10p
aural enhancer
X
470k
1n
470k3M9
+
1N4148
22k
master
volume
33k/A
unbalanced out
o
390p
470k
+200V
100p
470n
effects send
send
27k
effect blend
*
50k/A
27k
effects return
10p
TL072
+
50k/B
*
XLR pad
1M
470k
82k
390p
4k7
100k
22n
470k
+15V
12AX7
1k51M
22k
22k
10k
47k
39p
TL072
+
10k
TL072
+
+ TL072
-15V
1N4148
line-direct
double SPDT
toggle sw.
1k5
1k5
100
50k/A
22k
100
*
to tuner
X
10k
*
100n
10k
xlr balanced
d.i. output
56k
100p
TL072
100n
33k
220n
10k
+
100k
100k
470k
+200V
100p
1n
100
1N4002
82k
+200V
1k5
to amp
+15V
1M
100k
22n
12AX7
BA10339
8
9
1M33k
12k/1W
+
100/250V
270k
pwr amp clip
/4
14
2k2
X
+15V
+
100/250V
10p
180k
+
TL072
LED1
600V 1A
470n
170V~ 220V~
1N4148
33k
normalturbo
3k3
33n
4k7
+15V
X
270n
1k
4
5
Bass
50k/B
*
TL072
+
2
BA10339
8k2
470
470k/B
mid freq
1M33k
100k
/4
100k
22n
*
+15V
-15V
68n
680
TL072
33k
10n
+
6
7
100uF
100uF
*
1
BA10339
+
+
treble
mid
50k/B
50k/B
*
33n
3k3
+15V
LED1
preamp clip
2k2
/4
1N4004
7.5
7.5
7.5
7.5
1N4004
10
11
830/2W
830/2W
TL072
100p
33k
+15V
+
3
12
BA10339
13
+55V
from
power amp
supply
-55V
/4
gnd lift
*
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