An op-amp based overdrive in the family ... and on later iterations of the pedal an asymmetric 1N34 germanium diode was controversially added to more dramatically shift the character of the clipping.

Here’s how it works. Keeley has unveiled the Retro Super Germanium Overdrive pedal, a modified version of its Super Phat Mod. Promising to be a “fuzz, drive and a cranked amp all in one”, the Retro ...

Crazy Tube Circuits has released a limited edition twist on its Unobtanium preamp/overdrive pedal, the amp-in-a-box ... it adds OC45 germanium transistors to the K-style drive for more gain ...

The Klon Centaur is an often-imitated, highly sought-after and ultra-expensive overdrive pedal ... Unobtanium's stock mode retains the pedal's original vibe. Here, the germanium diodes clip ...

Rock in the new year with a guitar pedal you built yourself ... [Doug’s] rendition uses the warm sounds of germanium transistors in a design that produces professional results.