Homebuilt Hardware


sk-tubeVCF

Posted in Synth DIY by ryan on the August 7th, 2008

I have built a simple sallen-key VCF using a miniature tube (1J17B) as the main amplifier. There are a few opamps in the signal path, but they are only used with a gain of 1 as inverting and non-inverting buffers. The circuit is based on Ken Stone’s tube VCA which uses the 1J24B. The cutoff frequency is controlled using a dual vactrol.

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