What tubes does the Seymour Duncan Convertible 100 use?

The Seymour Duncan Convertible 100 uses 12AX7 preamp tubes and EL34 power tubes.

When was the Seymour Duncan Convertible 100 produced?

The Seymour Duncan Convertible 100 was produced 1985–1990.

Seymour Duncan Convertible 100 preset

Verified · 80/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Seymour Duncan Convertible 100 is a switchable 50/100-watt all-tube amplifier head, one of the most versatile and ambitious designs to come from Seymour Duncan's amplifier line. The Convertible allowed players to switch between half-power and full-power operation, changing the character of the power amp from punchy and compressed to clean and authoritative. Its multi-channel preamp and high-quality hand-wiring made it a standout instrument in the competitive boutique amplifier market of the mid-to-late 1980s.

Years produced: 1985–1990
Made in: US
Wattage: 100W
Channels: 2
Preamp tubes: 12AX7
Power tubes: EL34

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.