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 to LP. The discrete filter circuit is inspired by the 1970s Univox Mini-Korg 700 synthesizer's "Traveler" filter. The redesigned and adapted for Eurorack version provides warm, organic sound to your modular system, with enhanced features and access to filter modulation / cutoff.
With a boost switch that allows you to drive the High-Pass filter into the Low-Pass filter circuit, the HP overdrives the LP which changes the spectrum and further compressess the signal.
Independent resonance controls per filter section allows you to fine-tune a wide variety of focused sound. Set it for your maximum resonance level and let your control-voltages take over!
Input and Output level controls allow you to optimize dynamic range, including how hard you drive the filter--which drastically changes the sound, including a soft overdrive and shift in harmonics produced.
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
Note: All Specifications Subject to Change Without Notice - Vintage Synth Lab, LLC (c) 2022