VCA with a Russian 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 three-way 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.

http://www.xn--klangbaukln-zfb.de/vca/

• 30 mA +12V
• 30 mA -12V
• 0 mA 5V
• 50 mm Depth

No info about availability.