Dumble Overdrive Special ODS-100 - Clean preset

Verified · 86/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Overdrive Special is Howard Alexander Dumble's best-known design, built by hand in small numbers from 1972, each amp voiced for its player. One preamp with Bright, Deep, Rock/Jazz and PAB tone-stack-bypass switches feeds a relay-switched overdrive: two extra 12AX7 stages with their own drive, level and ratio controls. Four 6L6s give 100 watts, switchable to 50. Its smooth, vocal lead tone became the reference for blues and fusion soloing.

Known for: Robben Ford, John Mayer, Larry Carlton, Steve Lukather, Keith Urban, Sonny Landreth.

Heard on: Talk to Your Daughter — Robben Ford (1988); Ai No Corrida — Quincy Jones (1981); Howlin' Moon — Sonny Landreth (2008).

Tags: american, boutique, hand-wired, clean, crunch, 6l6, high-wattage, two-channel.

Schematic-derived preset files for 16 Fractal and Line 6 modelers: Axe-Fx II/XL/XL+, Axe-Fx III, FM3, FM9, and the full Helix family (Floor, LT, Rack, HX Stomp, HX Stomp XL, Native).

Gridleak extracts amp parameters from original circuit schematics using AI vision — component values, gain staging, tone stack topology, tube types — then generates native preset files for every supported modeler. Every extraction is scored 0–100 and the score is published.