The Valve Caster 2.0: Tube Boost and Overdrive: 7 Steps Some Background. This project uses a very interesting mode of operation of the vacuum tube, The Parts. There is some freedom in what you can do with this build, but the most basic required The Circuit. This is the circuit. The first stage is very similar to matsumin's circuit except that I Building the Box. If you can and would prefer this, you can wire some of the circuit up before you See all full list on instructables Selected Schematics - diystompboxes Arbiter. Fuzz Face (Guitar Related Circuits) OK! Check out this article on Guitars, Amps and Effects! Also a modified Fuzz face from the same site. Check out my common asked questions page for where you can get germanium transistors for this pedal. Here is an article on how to test those germaniums for use in the Fuzz Face Check out Oskar's Fuzz Face Tour.