The Acapulco Tone is a dirt-simple distortion Device based on the power section of a cranked vintage Sunn Model T, bringing openness, clarity, and crunch.
Designed to use onboard potentiometers, keep it tidy without using cables! The compact format fits perfectly in a 1590B enclosure. Baxandall EQ.
For further analysis on this circuit, take a look at this thread on Free Stomp Boxes Forum.