Marshall Jcm800 Lead Mstvol 100W 2203 preset

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

The Marshall JCM800 2203 is the definitive 100-watt single-channel master volume amplifier and one of the most historically significant guitar amplifiers ever produced, establishing the template for British high-gain rock and metal tone throughout the 1980s. Derived from the modifications players had long been making to JMP Super Leads, the 2203's master volume circuit allows the preamp to overdrive while the power amp remains at a controllable level. Its characteristic forward, aggressive midrange and tight low end became the sonic signature of bands from AC/DC and Iron Maiden to Guns N' Roses and beyond, and it remains the standard against which all British rock tones are measured.

• Years produced: 1981–1990
• Made in: UK
• Wattage: 100W
• Channels: 1
• Preamp tubes: 3× ECC83 (12AX7)
• Power tubes: 4× EL34

Known for: Angus Young, Dave Murray, Adrian Smith, Slash, Randy Rhoads.

Heard on: The Trooper — Iron Maiden (1983); Crazy Train — Ozzy Osbourne (1980).

Tags: british, vintage, crunch, high-gain.

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.