TM-2 VACUUM-TUBE BANDPASS FILTER AND VCA

Our TM-2 consists of two twin-t bandpass filters in parallel. Unlike any other such filter on the market, these filters use vacuum-tube pentodes. NO semiconductors. NO transistors. Thus, NONE of that thin, scratchy, transistory sound. These two filters have their resonant frequencies spaced 2 octaves apart--one filters the all-important midrange, the other filters bass. They are voltage-control-tuned with a custom-made "Vactrol" type matched-pair dual optocoupler. The resulting sound is GIGANTIC.