ValveCaster Overdrive

Tube Overdrive and Boost from 9 volts

A fellow named matsumin posted a very interesting overdrive circuit using a 12AU7 tube powered by nothing more than a 9 volt battery. This led to some experimentations on my part, and then I took them over to and created a thread on the forum about my experience with this nifty idea.

A big huge thread over ondiystompboxes.comthat discusses all this:


That was back in 2007. The thread is now over 150 pages long and has a lot of great discussion on this circuit, how to build it,  modifications, using other tubes, etc. So here's the basic schematic, some build instructions, and several variations.











Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.