Marshall Jcm800 Superlead 100W 1959 preset

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

The Marshall JCM800 Super Lead 1959 is the reissue of the original JMP Super Lead under the JCM800 branding, maintaining the four-input, two-volume, two-tone control layout of the classic 1960s/70s design without a master volume control. Unlike the master volume JCM800 models, the 1959 requires the entire amp to be pushed to high volumes to achieve natural power tube saturation — the method by which virtually every iconic rock guitar tone of the 1960s and 70s was produced. When driven hard, the cascading compression and harmonic saturation of four EL34s working at full output is utterly unmatched in the rock amplifier canon.

Known for: Jimmy Page, Pete Townshend, Jimi Hendrix, Eric Clapton.

Heard on: Won't Get Fooled Again — The Who (1971); Whole Lotta Love — Led Zeppelin (1969).

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.