Marshall Jcm800 Superlead 100W 1959A preset

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

The Marshall JCM800 Super Lead 1959A is a revised variant of the standard 1959 Super Lead reissue, incorporating minor component and layout revisions in the preamp that slightly shift the tonal character. The 1959A retains the same fundamental non-master-volume Super Lead circuit architecture and four-input layout as the standard 1959, producing the same massive, floor-shaking output when driven to its operating limits. Differences between the 1959 and 1959A are subtle and primarily of interest to collectors and technicians — both deliver the quintessential non-master-volume Marshall experience that defined rock and roll.

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

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

Heard on: 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.