Marshall JMP Master Volume 50W 2204 preset

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

The JCM800 2204 is a focused, single-minded rock machine — a single-channel 50-watt amp with a master volume that lets you dial in that classic Marshall crunch at any stage volume. It's tighter and more cutting than the vintage plexis before it, with a searing midrange presence that sits perfectly in a dense band mix. The 50-watt version is prized for its earlier power amp breakup and slightly more compressed, singing quality compared to its 100-watt sibling.

Known for: Slash, Zakk Wylde, Dave Murray, Kerry King, Angus Young.

Heard on: Sweet Child O' Mine — Guns N' Roses (1987); The Trooper — Iron Maiden (1983).

Tags: british, classic-rock, hard-rock, crunch, metal, 80s.

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.