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ADDAC System ADDAC611 Gotharman's VC Tube Filter

Eurorack Module
By Rory Dow

The ADDAC611 is not your typical filter. It is noisy, rough and sometimes violent, the Peaky Blinders of filters. This of course is entirely intended. The filter design was originally by fringe Danish synth manufacturer Gotharman. It was used in Gotharman's own Tubaz Filter module, which is no longer in production, but ADDAC System have partnered with Gotharman, not only to save the design from obscurity, but to add a few extras along the way.

ADDAC611 Gotharman's VC Tube Filter. Size: 12HP. Current: +12V 90mA, -12V 60mA.ADDAC611 Gotharman's VC Tube Filter. Size: 12HP. Current: +12V 90mA, -12V 60mA.At the heart of the 12HP is a genuine vacuum tube, visible through the circular grille cut out from the centre of the front panel. Different tubes are used during manufacture and, as a result, no two modules will sound identical. They are all genuine 1970s components because everything from the 1970s sounds better, right? They are certainly not audiophile tubes, but cheaper old stock with all the imperfections, distortion and phase-shifting that ensues.

Audio goes in via one of three audio inputs, which are mixed together using dedicated...

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Published December 2019