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Switchable vacuum tubes on a guitar pedal... - General Electronics - Arduino Forum
DIY Tube Overdrive Sound Demo - YouTube
Overdrive
Harby Noble Tone Overdrive / Boost / Distortion Pedal - Harby Pedals
Tom's Guitar Projects: RealTube-One - A 12at7 Tube Overdrive Pedal
The Persuader | Mod Electronics
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12au7 tube issue · Issue #60 · dsharlet/LiveSPICE · GitHub
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Perf and PCB Effects Layouts: TubeSound Overdrive
