Marshall SLP Reissue 100W 1959 preset

Verified · 92/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Marshall 1959SLP is a meticulous reissue of the iconic late-1960s Super Lead, voiced to faithfully recreate the plexi tones that defined rock and roll — the same raw, aggressive midrange, musical harmonic content, and voltage-sag-induced dynamics of the originals. Marshall engineers used original 1959 amplifiers as reference points, and the addition of an effects loop (with a true bypass switch) is the only meaningful concession to modern convenience. For players who want that unmistakable plexi roar without the price and unpredictability of a 60-year-old amp, the SLP remains the definitive option.

Known for: Slash, Angus Young, Joe Perry, Billy Gibbons.

Heard on: Welcome to the Jungle — Guns N' Roses (1987); Back in Black — AC/DC (1980).

Tags: british, plexi, vintage, crunch, classic-rock, reissue.

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.