The polarity of all Mojo Gear Fx pedals is centar negative( Boss style).

No !Vintage germanium fuzz pedals use pnp transistors ,witch means that the circuit has possitive ground...

You can use all Mojo Fuzz Fx germanium fuzz effects with isolated power supply(like t-rex fuel tank for instance), or with 9v battery.Of course you can use separate power supply( only for the fuzz pedal)

Yes! All of our pedals are true bypass.

No. Our products are tested and tuned for their best performance. The internal trim pots are there to help us fine tunning our products. Please, contact us before taking any actions!