B.Y.O.C. El Distorto Segundo Pre-built Pedal
Brands:
This one is a clone of the MXR Distortion II. Build Your Own Clone (BYOC) took a few liberties, like removing the part of the circuit that handles the bypass and made it true mechanical bypass, giving it asymmetrical clipping as a stock feature (of course you can just leave out the extra clipping diodes if you want), adding a toggle switch to switch between standard clipping and LED clipping which gives it a crunchier tone, and doing away with the noisy internal power transformer and allowing for a 9V battery or standard guitar effects power supply (9 ~ 18VDC). But aside from that, it's true to the original.
This is a little-known and somewhat rare effect. Although it's not fetching huge vintage prices yet, BYOC decided to make a clone of it because it is such a unique and interesting distortion. There really isn't any other circuit like this. It actually has two completely different distortion/overdrive circuits. The "resonance" knob blends the second circuit into the mix.