The Ross Distortion is very similar to two other famous distortion boxes of the late 70s (MXR Distortion +, DOD 250). However, it uses one side of a 4558 dual opamp instead of the single opamp (741) found in the the other two, and a few other tweaks in component values. There are two versions of this circuit: the Tan version, which uses 2 germanium diodes for clipping (originals used 1N270s, but 1N60Ps or 1N34As should also work just fine), and the Black version, which uses 3 silicon diodes for asymmetrical clipping. I’ve drawn up 2 layouts for each version, both will fit in a 1590A. The only difference is improved power filtering and added polarity protection in the larger layouts. The yellow 1µ caps are tantalum.
