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BK Butler Tube Driver - www.davidmorrin.com
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Overdrive
tube overdrive pedal under Repository-circuits -53558- : Next.gr
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Peppermill
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DIY Audio Electronics from Zynsonix.com: Matsumin Valvecaster Guitar Effects Pedal - Tube Overdrive
A DIY valve overdrive pedal – Goldie – Dave Mac's Window on the World
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