Mod K-700, Instructions Manual, Page: 18 / 24

Bass to Tremolo Modification Schematic (STYLE-B)
Here is a schematic representation of this mod for style B amps. It is not necessary to be able to read the schematic in
order to complete the mod.
1
2
3
V3
1M
68K
68K
+
1.5K 25 µ
100K
500p
100K
250p
.047 µ
.1
µ
6.8K
250KA
BASS
250KA
TREB
1MA
VOL
6
7
8
V3
+
1.5K
25 µ
BRIGHT
120p
100K
470K
220K
.01 µ
6
7
8
V2
+
1.5K 25 µ
100K
.01 µ
1MA
MSTR
.01
µ
220p
2
1
NORMAL
TO V4
(PHASE
INVERTER)
1
2
3
V1
1M
68K
68K
+
1.5K
750 µ
100K
100K
330p
.1 µ
.047
µ
8.2K
250KA
BASS
250KA
TREB
1MA
VOL
6
7
8
V1
+
1.5K
5 µ
DEEP
100K
400 VDC
220K
2
1
BASS
.01 µ
.1 µ
220K
400 VDC
1
2
3
V1
+
2.7K
22 µ
220K
6
7
8
V1
+
100K
22 µ
8.2M
500 VDC
100K
.01 µ
1M 1M
3M-RA
SPEED
100K
.01 µ
.02
µ
FOOT
SWITCH
3M
TREM
FROM BIAS TAP
50K-RA
INTENSITY
1
2
3
V3
1M
68K
68K
+
1.5K 25 µ
100K
500p
100K
250p
.047 µ
.1
µ
6.8K
250KA
BASS
250KA
TREB
1MA
VOL
6
7
8
V3
+
1.5K
25 µ
BRIGHT
120p
100K
470K
.01 µ
6
7
8
V2
+
1.5K 25 µ
100K
.01 µ
1MA
MSTR
.01
µ
220p
2
1
NORMAL
TO V4
(PHASE
INVERTER)
400 VDC
220K
220K
.1 µ
FENDER
®
BASSMAN 70 PREAMP
(BEFORE MODIFICATION)
FENDER
®
BASSMAN 70 PREAMP
(AFTER MODIFICATION)
1.2K
-60 VDC
18