“A breakdown of the Umble circuit will reveal a conglomeration of several schematics available on the internet (see the Dumble Amps section of Schematic Heaven for a nice assortment). We used the gain stages from the '70s ODS model and the tone stack from the front section of the '97 ODS model. We eliminated many of the large resistors and small caps that didn't have much affect on the tone, but increased the noise level somewhat. We also left out all the complex switching options and hard-wired a straight-ahead sound.”
