Valve Caster

The Valve Caster is a boost and overdrive designed to use a 12AU7 valve and run from a 9v battery (but I’ve found it sounds best running on 12v). It was designed by a guy called Matsumin and then developed further by Beavis Audio. Check out the Beavis Audio page about it here and read the thread on diystompboxes here.

The design I liked the most was the one with no tone control:

MatsuminValveCasterWiring No Tone

It’s a very full and warm sounding overdrive, and fairly simple to build as most of the circuit can be built on the back of the tube socket!

The values I used are as follows:

  • R1: 1MΩ
  • R2: 220kΩ
  • R3: 100kΩ
  • R4: 470kΩ
  • C1: 47nF
  • C2: 47nF
  • C3: 1uF
  • Gain: B50kΩ
  • Volume: A100kΩ
  • V1: 12AU7


Here it is all put together. I pop-riveted the valve socket in and then stamped the labels into the metal, which bent it a bit, but I think it looks kinda cool.

IMG_3990 IMG_3989 IMG_3827

I built two of these from February to April of 2012.


Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s