Marshall Jcm800 Lead 50W 1987 preset

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

The Marshall JCM800 Lead 1987 is the 50-watt single-input master volume head, essentially the 50-watt equivalent of the legendary 2203, and one of the most sought-after amplifiers in rock history. Running two EL34 power tubes, it breaks up earlier and with greater harmonic richness than the 100-watt version, making it particularly beloved for recording where natural power tube saturation at manageable volumes is paramount. Its single-channel design forces the player to use the guitar's volume control for tone shaping, producing a uniquely dynamic and responsive playing experience.

• Years produced: 1981–1990
• Made in: UK
• Wattage: 50W
• Channels: 1
• Preamp tubes: 3× ECC83 (12AX7)
• Power tubes: 2× EL34

Known for: Angus Young, Dave Murray, Adrian Smith.

Heard on: Back in Black — AC/DC (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.