GREEN PONY

The OD-820 was Maxon's answer to the popularity of the Klon Centaur. While it's not a clone of the Centaur, it still employs the same dual-ganged drive knob concept that gives the Centaur its ability to go from a completely clean transparent boost to an overdrive and an internal charge pump that takes your standard 9 volt power supply and increases the voltage for extra headroom. Where the two circuits really differ though is in the actual distortion circuit. The OD-820 uses Maxon's (and Ibanez's) famous Tubescreamer circuit. This is a huge advantage for DIY-ers since there are many well documented modifications for the Tubescreamer, and most of them apply to the OD-820.