Marshall JCM800 Model 2001 375W Bass Amp - Input C preset

Verified · 85/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Marshall 2001 is an extremely high-powered PA/lead amplifier from the JMP Major era, rated at 375 watts and intended for large-scale public address and concert use. Running eight EL34 power tubes, it represents Marshall's attempt to dominate the professional touring market of the early 1970s. The circuit topology follows the standard JMP preamp configuration but with a massively scaled output stage, giving it vast headroom and a powerful, authoritative clean tone that breaks up only at extreme volumes.

• Years produced: 1966–1975
• Made in: UK
• Wattage: 375W
• Channels: 1
• Preamp tubes: 3× ECC83 (12AX7)
• Power tubes: 8× EL34

Tags: british, 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.