Marshall Jcm800 50W 4010 preset

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

The Marshall JCM800 4010 is a 50-watt 1×12 combo version of the JCM800 single-channel master volume circuit, delivering the same acclaimed preamp topology as the 2203 and 2204 heads in a self-contained combo format. The 4010 combines the portability of a combo with serious stage power, and its single 12-inch speaker produces a focused, cutting tone that projects well in live settings. Like all JCM800 single-channel models, it cleans up beautifully when the guitar volume is rolled back and produces some of the most iconic British crunch in rock history at full settings.

Tags: british, vintage, 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.