What tubes does the Seymour Duncan 84 40 use?

The Seymour Duncan 84 40 uses 12AX7 preamp tubes and EL34 power tubes.

When was the Seymour Duncan 84 40 produced?

The Seymour Duncan 84 40 was produced 1984–1988.

Seymour Duncan 84 40 preset

Verified · 90/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Seymour Duncan 84-40 is a 40-watt all-tube guitar amplifier produced by the Santa Barbara, California pickup and electronics company during their brief but highly regarded foray into amplifier manufacturing in the 1980s. Seymour Duncan applied the same obsessive attention to component quality and tonal engineering to his amplifiers that had made his pickup designs legendary, resulting in hand-wired tube amps with exceptional harmonic richness and touch sensitivity. The 84-40 is now a coveted collector piece representing a rarely explored chapter in Seymour Duncan's output.

Years produced: 1984–1988
Made in: US
Wattage: 40W
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.