R-52 Vacuum-Tube Filter - 22HP

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Item: N13-2269

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R-52 Vacuum-Tube Filter - 22HP


The R-52 uses two pentodes, type 12AW6. The circuit is derived directly from our award-winning TM-2 filter, but with all the features of our TM-6 filter.

A pair of bandpass filters is swept with a Vactrol(tm) control element, a resonant treble filter and a less-resonant bass filter, giving a 4-pole lowpass response.

Filter sweep range (approx): bass-only 80-200 Hz, bandpass/lowpass LOW setting 300-1000 Hz, HIGH setting 800-1900 Hz.

Filter resonance/Q adjustable from less than 1 to oscillation. Voltage gain approx. 2 with RESONANCE set to 10 o'clock position and INPUT LEVEL set to maximum. Both filters, or one at a time, may be selected and mixed in desired amounts using the front-panel RESPONSE control. This allows for a wide range of equalization and special sound effects. CV inputs are available for sweeping the cutoff frequency and for affecting the treble filter's resonance.


  • Input Level Control
  • Response Control
  • Tuning Offset Control
  • Resonance Control
  • Range Select Switch
  • Audio Input
  • Sweep CV In
  • Resonance CV In
  • Audio Output

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  • Eurorack Module
  • Circuit distortion is less than 0.5% typical.
  • 22 HP Wide
  • < 1" Depth
  • +12v: 150 mA Current Draw
  • -12v: 150 mA Current Draw

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