Small Tube VCA/Distortion Modules @JohnSchussler
Small Tube VCA/Distortion Modules  @JohnSchussler
Uploaded December 2022 | Updated September 2026, 2 weeks ago
There seem to be more and more folks making modules with small tubes these days. I have a few of them, and figured I'd do a comparison. These are all "distortion" modules in one sense or another. Some are VCAs, some are filters, and some are just tube-y grimy-ness.

I've also thrown in an intro to the cDVCA, a new kind of VCA that is also a specialist at distortion. It doesn't have a tube, so it gets a solo spot at the end.

Source audio is the saw out of an Acid Rain Chainsaw. Envelope from Zadar.
Sequence from Stochastic IG

00:00 Intro
00:20 Atonal OD - sweeps
03:52 Karltron Tube
06:35 Thermo Nuclear
09:27 Gotharman
11:48 Atonal OD - sequence
15:50 Karltron Tube
18:52 Thermo Nuclear
21:49 Gotharman
25:32 Bonus - cDVCA
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John Schussler |

Small Tube VCA/Distortion Modules

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