[an original Marshall Supa Fuzz]
[three original Vox Tonebenders]
[a Tonebender MKII circuit with Mullard OC81 germanium transistors]
And here's a receipt for Jimmy Page's Tonebenders from SolaSound!
And here's a video of the D*A*M Tonebender MKII Professional in action, I think you'll agree it sounds pretty mind/ear/sense destroying:
Now here's the schematic. Here you can see the three transistor layout. As with any simple fuzz circuits the transistor type and gain is a huge factor in deciding the overall tone of the unit. It's recommended that the gain of Q1 ~ 70hfe with Q2 ~ 70-90hfe and Q3 ~ 100-120hfe. I've built many Tonebenders with many different type of transistors. Always use a germanium transistor for Q1, then you can experiment with low gain silicon transistors. Experiment and have some fun, you'll certainly find a decent fuzz tone or two! For some more detail on exact circuit operation and mods visit: http://fuzzcentral.ssguitar.com/mkII.php