Cart 0

RK6 Resonant Lowpass Filter


  • $ 50000

The RK6 is a TOTALLY UNIQUE product, one that has never existed before.  It is a Sallen-Key lowpass filter with a feedback loop, to allow it to resonate.  There are no integrated circuits or transistors in the signal path.  It is a PURE TUBE design, the sort of design that might have been invented in the 1950s if anyone had dared to create a turnable lowpass filter for musical uses before Moog and Buchla. It even uses a coupling transformer to provide the proper phase of the feedback signal -- pretty a "classic good old days" approach, and one rarely seen in the 21st century.  Two "vactrol" optocouplers tune the filter, and another coupler allows CV control go the filter's resonance.

We Also Recommend