SH VCF

Radical Frequencies SH-1 Replica

100% Handmade through hole Radical Frequencies SH VCF It is a complete discrete through hole replica of the the original mono synth SH-1 filter from late 70s! In detail it is a cascaded OTA low pass filter with four OTA-stages of the original vintage CA3080 ICs with FET transistors as Buffers, it has 2 inputs with potentiometer, 1 CV input with potentiometer and 4 independent low pass outputs one for every OTA stage: 6db , 12db , 18db and of course 24db. The 6db and 12db outputs are in 180° phase, as result you can mix them together with 24db out in a mixer to make bandpass and high pass combinations!

In order to achieve a clean sound the input level must not be over 70% to 80% but if you boost the input you take a wonderful saturation that if it's combined with a lot of resonance the result is magic especially from the 6db out! Of course, the 24 db out is perfect for rubber and punchy basses like the classic vintage Japanese synths.

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