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Hohner StringVox K2 Repair Notes
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Hohner StringVox K2 Repair Notes

Drawings, schematics, & notes
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Summary of Contents for Hohner StringVox K2

  • Page 4 ⚫ ⚫ ⚫...
  • Page 7 ELEX K2 (Hohner Stringvox) (r3): Wiring Diagram designed c.1975–79 ELEX S.p.A. (Excelsior) drawn 2024 electropict Mains Fuse Sust. Piano (220/240V AC) (T500mA) Pedal Board Gen. Vol. Piano /Harp Bass General Panel (DIN 41622-16) (DIN-5-180) (TS) (TS) (TS) (TS) Pitch In one earlier revision, the bass...
  • Page 8 ELEX K2 (Hohner Stringvox) (r3): Tone Signal Route electropict 2024 K2-2 K2-14 M175 Strings (bass) K2-13 Strings (bass) Strings (treble/all) Strings (treble) Cello+Strings K2-6 K2-20-2 K2-7 Cello (bass) (×3) Cello (bass) Cello (treble/all) K2-1 Cello (treble) OS-5 (×61) (oscillator dividers &...
  • Page 9 ELEX K2-0 Power Regulator Board: Drawing components side, shown transparent to circuit side designed ELEX S.p.A. (Excelsior) c.1975–79 | drawn 2024 Electropict R8 33K R8 33K BC286 BC286 BZX 79C11V BZX 79C11V 33 4V~ AC in 4× 4× 220 35V 220 35V BC286 BC286...
  • Page 10 ELEX K2 (Hohner Stringvox) (r3) Power Supply: Schematic designed ELEX S.p.A. (Excelsior) c.1975–79 drawn 2024 Electropict M282 2m2 50V 2N3055 2 × T500mA T. EE13 Q3 BC286 330R +44V (5W?) (5W?) Q2 BC286 Q4 TIP41A 33 4V 120R D1–4 1N4003...
  • Page 11 ELEX K2 (Hohner Stringvox) (r3) K2-1 Voicing Board:  Drawing designed c.1975 ELEX S.p.A. (Excelsior) drawn 2024 electropict C7 + + C8 R14 R15 R16 R14 R15 R16 The board is drawn from components side, semi-transparent to show the There are twenty versions of the board each with varying resistor and circuit side.
  • Page 12 ELEX K2 (Hohner Stringvox) (r3) K2-1 Voicing Board:  Schematic designed c.1975 ELEX S.p.A. (Excelsior) | drawn 2024 electropict R20 47K 10 –10+20% 4 7 –10+20% 2 2 ±20% 50V 2 2 ±20% 180K R1 4K7 R10 47K 560K 820K 560K sustain [†]...
  • Page 14 ELEX K2 (Hohner Stringvox) (r3) K2-2 ‘Matrix’ Board: Schematic designed c.1975 ELEX S.p.A. (Excelsior) drawn 2024 electropict bass range treble range b a61 solder teminals for wires to K2-3 ⓐ 1 1 ⓐ piano sustain (off = grounded) 0R56 +1 5...
  • Page 15 K2 Divider Pitch Outputs Dividers Pins Dividers are numbered left to right.  Only output pins are shown. Outputs are shown as IPN pitches. B 0 and E 1 are not used. This table does not include the top octave F#6–F7 which is produced by the TOG chip on OS-5.
  • Page 16 ELEX K2 (Hohner Stringvox) (r3) K2-3 Contacts Board: Schematic designed c.1975 ELEX S.p.A. (Excelsior) drawn 2024 electropict bass range treble range key numbers strings treble strings bass busbar (+20) busbar (+20) pianos-off busbar (–26) pianos-on busbar (GND) ensemble busbar (+20) 63 470n strings oct.
  • Page 17 ELEX K2 (Hohner Stringvox) (r3) K2-6 & K2-7 Preamp Boards: Schematics designed c.1975 ELEX S.p.A. (Excelsior) | drawn 2024 electropict K2-6 K2-7 3K9 10% 330K 100K 100n 100K 330K 5% 2 × 100K 22 20% 33K 5% BC550B 560R 22 20% 2 ×...
  • Page 18 ELEX K2 (Hohner Stringvox) (r3) K2-10 Piano & K2-9 Bass Boards: Drawings Shown from components side transparent to solder side. designed c.1976–79 ELEX S.p.A. (Excelsior) | drawn 2024 electropict C5 C4 + C5 C4 C15 + Component numbers are assigned arbitrarily in the absence of orignal docuumentation.
  • Page 19 ELEX K2 (Hohner Stringvox) (r3) K2-10 Piano & K2-9 Bass Boards: Schematics designed c.1976–79 ELEX S.p.A. (Excelsior) drawn 2024 electropict K2-10 K2-9 Q1 BC550B R1 12K R8 22K R1 15K R6 39K audio to R2 1K5 470p Bass output 220K...
  • Page 20 ELEX K2 (Hohner Stringvox) (r3) K2-110 & K2-12 Switching Board: Drawing designed c.1975–79 ELEX S.p.A. (Excelsior) Drawn from B (components) side, transparent to show both sides’ traces. drawn 2024 electropict 10 11 12 13 1516 1718 19 20 21 24 25 2 28 Full Keyb.
  • Page 21 ELEX K2 (Hohner Stringvox) (r3) K2-110 & K2-12 Switching Board: Schematic designed c.1975–79 ELEX S.p.A. (Excelsior) drawn 2024 electropict Cello Cello Cello Cello Strings Strings Strings Strings Cello strings Strings ensmb. Cello Strings Piano Harps. +13V PH(B) Harps. Bass Piano...
  • Page 22 ELEX K2 (Hohner Stringvox) (r3) K2-13 Controls Board: Schematic designed c.1976 ELEX S.p.A. (Excelsior) drawn 2024 electropict Piano Harpsichord Cello Strings grounding Piano Harpsichord Cello Strings switches Bass (bass) (bass) (bass) (bass) (treble) (treble) (treble) (treble) all strings cello cello...
  • Page 23 ELEX K2 (Hohner Stringvox) (r3) K2-13 Controls Board: Drawing designed c.1976 ELEX S.p.A. (Excelsior) Shown from components side transparent to solder side. drawn 2024 electropict 1 2 3 2 2 8 2 2 2 9 R9 R10 R9 R10 R6 R7...
  • Page 24 ELEX K2 (Hohner Stringvox) (r3) K2-14 Controls ‘Matrix’ Board: Schematic designed c.1975–79 ELEX S.p.A. (Excelsior) drawn 2024 electropict Strings (bass) decay 10 11 2 12 13 14 15 16 2 17 18 19 20 2 2 21 22 23 2 24 2...
  • Page 25 ELEX K2 (Hohner Stringvox) (r3) K2-20-2 Modulation Board: Drawing design c.1975–79 ELEX S.p.A. (Excelsior) | drawn 2024 electropict C8 C9 C10 C8 C9 C10 audio audio modulation Shown from components side transparent to solder side. The K2-20-2 takes an input audio signal and delays it using the TCA350Z BBD chip, by amounts controlled by the incoming modulation signal from the M174 Oscillator board.
  • Page 26 ELEX K2 (Hohner Stringvox) (r3) K2-20-2 Modulation Board: Schematic design c.1975–79 ELEX S.p.A. (Excelsior) | drawn 2024 electropict R10 120R R12 2K7 R14 10K 560R ⁄ 150R 150R ⁄ ⁄ 680R ⁄ 560p 560p 220n 120R 120R ⁄ ⁄ R4 1K0...
  • Page 27 ELEX K2 (Hohner Stringvox) (r3) M174 Modulation Oscillator Board: Drawing designed c.1979 ELEX S.p.A. (Excelsior) | drawing 2024 electropict R26R27 R26R27 R1 R2 R3 R1 R2 R3 R6 R7 R6 R7 R9 R10 R9 R10 +13 –13 modulation outputs Components (B) side with traces, shown transparent to A side traces.
  • Page 28 ELEX K2 (Hohner Stringvox) (r3) M174 Modulation Oscillator Board: Schematic designed c.1979 ELEX S.p.A. (Excelsior) | drawing 2024 electropict VR1 5K0 VR1 5K0 VR2 5K0 VR2 5K0 150n R2 180K R2 180K R4 180K R4 180K R7 180K R7 180K...
  • Page 29 ELEX K2 (Hohner Stringvox) (r3) M175 Chorus ‘Matrix’ Board: Schematic designed c.1979 ELEX S.p.A. (Excelsior) drawn 2024 electropict K2-6 K2-20-2 K2-20-2 K2-20-2 M174 K2-7 shield vol. pedal (grounding) shield strings audio (to gen. out) –13V +13V GND/shields strings audio audio...
  • Page 30 ELEX K2 (Hohner Stringvox) (r3) OS-5 Oscillator & TOG Board: Schematic designed c.1975 ELEX S.p.A. (Excelsior) | drawn 2024 electropict 680R 100K ⁄ ⁄ 820p 780p 172C MK50240 172C 558A 820p 390K 780p + acc. – Terminal descriptions are as on the K2-2 board.

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Elex k2