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Metasonix R52


Vacuum-Tube Voltage-Controllable Multimode Filter

The R-52 uses two pentodes, type 12AU6. The circuit is derived directly from Metasonix’s award-winning TM-2 filter, but with all the features of its 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 peaking from Q 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. Circuit distortion is less than 0.5% typical.


  • +/-12V Doepfer-style power connector
  • alpha rk12l potentiometers
  • kobiconn vertical-mount 3.5mm jacks
  • Current Consumption: 150mA
  • Panel size: 22HP

Other modules by Metasonix | R-51 | R-53 | R-54 Mk2 | R-56 Reverb | R-57 Dual VCA (last one – once it’s gone it’s gone!) | R-60 | RK1 Noisedrum | RK2 XS-VCA