Marshall 50W 2204S preset

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

The JCM800 2204S is the studio or special version of Marshall's revered 50-watt master volume single-channel head, essentially the 2204 platform with refinements for lower noise and cleaner signal path. The 2204 circuit itself is one of the most influential amplifier designs in rock history — its single-input master volume configuration was derived from modifications players and technicians had been applying to the JMP Super Lead for years. Two EL34s running at proper operating points deliver a tight, cutting tone that cleans up beautifully when the guitar's volume is rolled back.

Known for: Angus Young, Billy Gibbons.

Tags: british, crunch.

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.