Seymour Duncan Convertible 100 - Overdrive preset

Verified · 87/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Seymour Duncan Convertible 100 is a 100-watt 1980s tube head named for its plug-in preamp modules that let the player swap its voicing. An input module feeds two footswitched channels, each with its own treble, bass and mid, overdrive module, master and reverb level, plus an LM380-driven spring reverb and an effects loop. A 12AX7 and two 12AU7s drive four EL34s with variable power, variable damping and a slave out, on a 5U4 rectifier.

• Made in: USA
• Wattage: 100W
• Channels: 2
• Preamp tubes: 1× 12AX7, 2× 12AU7
• Power tubes: 4× EL34

Known for: Jeff Beck.

Tags: american, two-channel, high-wattage.

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.