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ELEX K2 (Hohner Stringvox) (r3) K2-6 & K2-7 Preamp Boards: Schematics
K2-6
100n
330K 5%
22 20%
50V
33K 5%
68p
2 × BC550B
4
3
+22
strings
audio to
K2-20-2s
Pin numbers for the K2-6 are approximately based on the K4
schematic but it's too faint to read all of them; those for the K2-7
are as on the schematic.
3K9 10%
5K6
5%
2 ×
100K
5%
15K
5%
22 20%
3K9 10%
220n
2
2
2
GND
strings
audio from
K2-13
designed c.1975 ELEX S.p.A. (Excelsior) | drawn 2024 electropict
47n
1K2
50V
5%
1
In the K4 schematics, K2-6 is also called P.A.I and K2-7 is P.A.II.
(Preamp?) Other than that the images I've seen are too faint to
make much out.
K2-7
330K
100K
5%
5%
220
20%
35V
10K
5%
BC550B
220n
5
4
3
+27
+22 out
strings
audio to
General
Output
22
100K
20%
5%
50V
560R
3K9
5%
10%
1
/
W
2
22
20%
50V
220n
2
1
GND
strings
audio from
K2-20-2s
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