Röhren VCA (Tube VCA)

VCA with a mini-tube, featuring a feedback circuit and a bias voltage switch.

A VCA module using a Russian mini-tube, made by Klangbau Köln.

It features a gain knob and a switch for the tube's bias voltage (to achieve a different saturation sound), a CV input, two audio inputs and an audio output - all with attenuators.

The second audio input is normalled to the first input, which lets you add feedback.

Produces a real warm and compressed tube sound. With feedback creat fuzzy sounds with subharmonic content, realy surprising.
It work also like a wavefolder, input a sinewave and fold it in the tube manner.

It consumes only 30ma and don´t get warm or hot, as you my expect., no extra power supply, works also with +-15V .

With 9hp black frontpanel avialable, please ask.

Oct 2018: A 35mm deep version available, please ask me!


  • 30 mA +12V
  • 19 mA -12V
  • 0 mA 5V
  • 50 mm deep
  • Ø 4.14 (7 Votes) Average Rating

This Module is currently available.

$117 Price in € submitted Mar 1st 2014, 16:25 by NightMachines | last Change Oct 21st 2018, 12:58 by klangbaukoeln

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