12dB/oct Vacuum Tube VCF (no semiconductors) @256byteram
12dB/oct Vacuum Tube VCF (no semiconductors)  @256byteram
Uploaded July 2018 | Updated September 2026, 1 week ago
A wobbly demonstration of a filter I designed. I'm not aware of anything that might be like this (I tend to work in a vacuum... no pun intended) so please comment if you're working or know of something similar. It'll do 24db/oct, however that'd need an additional four tubes which I don't have at the moment.

The synthesizer I'm using is my DIY one I made in 2011. It's developed a fault where the oscillator CV won't go above a certain voltage, so there are a few dud notes in this demonstration.

I might make a Hackaday Projects page for this.
EDIT: hackaday.io/project/163761-vacuum-tube-synth-filter
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256byteram |

12dB/oct Vacuum Tube VCF (no semiconductors)

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