This is a distortion pedal I bought on Ebay. The bloke who made it claimed it was based a Big Muff. It's got a huge, bass-y tone.
Here's what the bloke wrote on Ebay:
If you cant figure out what pedal inspired this build...its a Big Muff circuit which i have built on vero/stripboard.
its not a straight up clone of any particular era Muff but i spent a good while experimenting with different component/value changes to get to what i thought was my ideal muff.
uses 4x 2N5089 transistors and a few modifications which include:
tone: more woolly/muffy/wall of sound... whilst still retaining have clarity and on the other end of the spectrum, more crisp/tight but without the huge mid scoop on the pedals tone/eq knob (labelled "texture")
Sustain/Gain : more of...
Pedal is housed in an aluminium enclosure (BBE pedal size for reference) and uses Switchcraft input jacks with a Clear/Purple 5mm Indicator LED/Berzel.
It is wired for True Bypass and has a battery snap and Power supply jack (2.1mm centre neg. standard boss style power supply) - NOT INCLUDED
there is additional power supply filtering on the jack (for those with dodgy cheapo power supplies)
NOTE: the power supply jack depicted in the attached Photo has been replaced with one that sits more "flush" with the enclosure, so it now doesnt stick out as much)
The enclosure is enamel auto paint with water laser printed waterslide decals with a layer of micro-sol (for the painted on affect) and then further clear coated.