The VCF-74 (MK2) is a 14HP analog voltage controlled filter in Eurorack format, inspired by the 1970s MiniKorg 700/700s synthesizer design.

VCF-74 features a dual analog highpass and lowpass filter, cascaded (series, from HP > LP). The discrete diode filter circuit is (inspired by the 70s Univox Mini-Korg synthesizer's "Traveler" filter section) which provides warm, organic sound to your modular system. A stage boost switch allows you to drive the 2nd filter section (Low-Pass) with a +5.3dB signal boost from the High-Pass output signal. Independent manual resonance controls per filter section allows you to fine-tune a wide variety of focused sound. Input and Output level controls allow you to optimize dynamic range, including how hard you drive the filter--which drastically changes the dynamic interplay between signal and harmonic resonance. Both High-Pass and Low-Pass circuits have independent "offset" controls that will allow for fine tuning of each filter's cutoff. The VCF-74 can be set up as a Low-Pass, High-Pass, or Band-Pass filter. Width of the Band-Pass can be adjusted by simply dialing in the offset controls appropriately.

What are the changes from MK1 to MK2?

  • The faceplate will look exactly the same, except the addition of "MK2" nomenclature screen printed.

  • The audio signal path will have slightly lower frequency response as a result of component value changes.

  • The audio signal path will now use fewer coupling capacitors (more direct-coupled circuits mean better performance, less slewing).

  • Added buffer circuits at the input and final filter-to-output stage (which will improve performance)

  • Added calibration trim-pots for resonance control.

  • Revised "local" power supply filtering scheme to improve PSR for the discrete (Class-A) filter stages.

  • Added ESD protection (ESD suppressor diodes) to each front panel jack.

  • Changed power inlet header from 16P to 10P.

  • Widened range of Low-Pass cutoff control.


  • 41 mA +12V
  • 48 mA -12V
  • 0 mA 5V
  • 29 mm deep

VCF-74 Mk2 : Eurorack filter, analog, voltage controlled, diode-ring, vintage

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