Marshall JMP Super Lead 1959 preset

Verified · 93/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The JMP Super Lead 1959 is the 100-watt plexi-era head that became the standard rock amplifier of the late 1960s and 1970s. High Treble and Normal channels share a Treble/Middle/Bass/Presence stack, and four EL34s with no master volume produce its crunch at high volume. Jumpering the two channels together for more gain became a common trick.

• Years produced: 1965–1981
• Made in: UK
• Wattage: 100W
• Channels: 2
• Preamp tubes: 3× ECC83
• Power tubes: 4× EL34

Known for: Jimi Hendrix, Eddie Van Halen, Angus Young, Eric Clapton, Pete Townshend, Randy Rhoads, Joe Satriani.

Heard on: Star Spangled Banner (Live at Woodstock) — Jimi Hendrix (1969); Eruption — Van Halen (1978); Back In Black — AC/DC (1980); Crazy Train — Ozzy Osbourne (1980); Surfing with the Alien — Joe Satriani (1987).

Tags: british, vintage, plexi, crunch, el34, high-wattage, 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.