Marshall Jcm800 Studio15 15W 4001 preset

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

The Marshall JCM800 Studio 15 (model 4001) is a 15-watt 1×12 combo from the JCM800 era, designed specifically for recording studio environments where the natural power tube saturation of a larger amp would be impractical. At 15 watts the EL34 output stage reaches full saturation at very reasonable volume levels, producing the characteristic JCM800 harmonic content and compression in a form that recording engineers could work with. The Studio 15 is one of the most sonically efficient Marshall amps ever made — a genuine powerhouse of tone in a compact, manageable package.

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.