Maestro FZ-1S Super Fuzz-ToneVerified

From the post

The Maestro Super Fuzz-Tone was introduced in the early 70s. It uses 6 transistors, 2 of which are used as clipping diodes. Original transistors were 2N5133s, but 2N5088s or BC109Cs can be good subs. I've built 2 clones of this pedal in the past (though not with this layout) and used 2N5088s with good results. The original Balance control was a 30k dual gang pot, which you would probably have a very hard time sourcing. In both my clones I used a 50k with no problems, but if you want you can put 82k resistors between lugs 1 and 3 to get the dual gang pot to around 31k, though it will mess with the taper some. Said Balance control acts almost like a clean blend, and the switch offers 2 different tones. If you're tired of Big Muffs, give this one a try. Works great on bass too.

Here's a couple really short demos I did on guitar and bass on one of the clones I built a few years ago (pardon my butchering of a couple Black Keys songs).