Dumble ODS-100 Overdrive Special - OD preset

Verified · 82/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

Howard Alexander Dumble began building custom amplifiers for close personal clients in the early 1970s, and fewer than 300 ODS-100 units exist — each potted in epoxy to prevent circuit analysis, and each voiced to the specific tonal preferences of its original owner. The ODS circuit centers on a unique overdrive topology that cascades two 12AX7 triodes through a carefully tuned mid-frequency emphasis before hitting the 6L6 output section, producing an overdrive character that is creamy and vocal where other amps at the same gain level sound compressed or fizzy. Stevie Ray Vaughan's live tone, Robben Ford's studio work, Larry Carlton's jazz-fusion lead playing, and John Mayer's post-2000 blues recordings all run through Dumble ODS units — a span of genres that reflects the amp's unusual combination of dynamic touch sensitivity and harmonic richness at any gain setting.

Known for: Stevie Ray Vaughan, Robben Ford, Larry Carlton, Carlos Santana, John Mayer, Eric Johnson, Jackson Browne.

Heard on: Talk to Your Daughter — Robben Ford (1988); Room 335 — Larry Carlton (1978); Riviera Paradise — Stevie Ray Vaughan (1989).

Tags: american, boutique, clean, crunch.

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.