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Tube Overdrive Guitar Pedal | by Tim Patterson
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Tube Overdrive Guitar Pedal

My version of the Matsumin Valve Caster 12AU7 tube overdrive pedal. I deviated a little from the original schematic by Matsumin, and changed the C3 output capacitor value to 1uF based on the Beavis Audio schematic. It sounds good, with softer overdrive/mild distortion, and does boost the signal a good bit.

 

Full Parts List:

 

1 Sino 12AU7 Tube (Tube Depot: SI-12AU7), $11.95

1 9-pin miniature socket with shield (Tube Depot: SK-9PINF), $3.45

1 100kΩ 1% metal film resistor (Mouser: 660-MF1/4DCT52R1003F), $0.05

1 220kΩ 1% metal film resistor (Mouser: 660-MF1/4DCT52R2203F), $0.05

1 470kΩ 1% metal film resistor (Mouser: 660-MF1/4DCT52R4703F), $0.05

1 1MΩ 1% metal film resistor (Mouser: 271-1.0M-RC), $0.13

1 50kΩ 16mm linear taper gain potentiometer (Pedal Parts Plus: #7505), $1.25

2 100kΩ 16mm audio taper volume & tone potentiometers (Pedal Parts Plus: #7501), $2.50 ($1.25/ea)

2 .01µF polyester film capacitors (Mouser: 23PS310), $0.78 ($0.39/ea)

1 .047µF polyester film capacitor (Mouser: 539-150473J250BB), $0.46

1 1µF aluminum electrolytic capacitor (Mouser: 647-TVX1H010MAD), $0.31

20 gauge red cloth insulated wire (Tube Depot: CW-20-SLD-RED), $0.55 ($0.55/foot)

20 gauge black cloth insulated wire (Tube Depot: CW-20-SLD-BLACK), $0.55 ($0.55/foot)

20 gauge green cloth insulated wire (Tube Depot: CW-20-SLD-GREEN), $0.55 ($0.55/foot)

3 lug terminal strip (Tube Depot: P-TS-809), $0.50

1 #6-32 ¼" nut and bolt (Home Depot), $0.10 (for terminal strip)

2 black fluted small “MXR” knobs (Pedal Parts Plus: #10001), $0.77

1 black fluted large “MXR” knob (Pedal Parts Plus: #10002), $0.75

1 2.1mm DC power jack (Mouser: 163-4302-E), $1.38

1 Switchcraft ¼" mono output jack (Pedal Parts Plus: #6005), $0.50

1 Switchcraft ¼" stereo input jack (Pedal Parts Plus: #6006), $0.75

1 DPDT “true bypass” footswitch (Pedal Parts Plus: #9001), $2.50

1 1590BB enclosure (Pedal Parts Plus: #1126), $6.75

“Copper Translucent” paint job for 1590BB enclosure (Pedal Parts Plus: #101), $3.20

 

Total cost of parts was $39.83 (+ shipping fees) in parts, not bad at all for such a cool little pedal!

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Taken on March 11, 2011