Marshall Rackmount 2x40W 8004 - Overdrive preset

Verified · 88/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Marshall 8004 is a 2×40W solid-state rackmount power amplifier from the late 1980s and 1990s, designed as a touring-grade stereo power stage for rack-based guitar rigs. Its reliability and road-worthy construction made it a staple of professional rigs of the era.

• Years produced: 1988–1996
• Made in: UK
• Wattage: 80W
• Channels: 1
• Preamp tubes: —
• Power tubes: solid-state MOSFET

Tags: rackmount, power-amp, studio, solid-state.

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.