Available as an assembled Module and as a DIY project.
This Module is currently available.
Sharp Cutoff Filter Model 191 clone
Sharp Cutoff Filter Model 191 clone.
La Sesenta y Siete 191 Sharp Cutoff Filter Module is a voltage controlled highpass and lowpass filters with 24 db/octave slopes . Cutoff frequencies are variable from 5 cps to 20 kc with no range switching . Also functions as a bandpass filter with voltage controlled center frequency and bandwidth
These merchants probably sell this module. Huh?