Marshall JCM800 4210 preset

Verified · 90/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The JCM800 split-channel reverb family: the 2205 (50W) and 2210 (100W) heads and the 4210 (50W 1×12), 4211 (100W 2×12) and 4212 (50W 2×12) combos all share one circuit. A footswitchable Normal channel sits beside a Lead channel with diode clipping for extra gain, followed by spring reverb and an effects loop.

• Years produced: 1982–1990
• Made in: UK
• Wattage: 50W
• Channels: 2
• Preamp tubes: 5× ECC83
• Power tubes: 2× EL34 (50W) / 4× EL34 (100W)

Known for: Tom Morello.

Heard on: Killing in the Name — Rage Against the Machine (1992).

Tags: british, crunch, high-gain, reverb, el34, two-channel.

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.