Dual Bandpass Filter with VCA
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TM-2 Vacuum Tube Dual Bandpass Filter/VCAIncludes box and power supply.The TM-2 consists of two twin 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.Resonance or "sharpness" for the filters is adjustable. The filter outputs pass through an additional pentode which may be used as a VCA for electronic-music effects. (TM-2 may be used purely as a tube VCA by turning down the filter resonance.) Output signal is buffered, so it can drive any line-level input.Use it as a stand-alone effects box, or mount it in your analog modular synth using TM-M or TM-D kits.

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