Marshall 68 1987 preset

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

The Marshall 1987 is the 50W sibling of the 1959 Super Lead, sharing the same plexi-panel circuit but with a pair of EL34s for a slightly softer, more touch-sensitive response. It covers everything from clean headroom to full-throttle British crunch.

• Years produced: 1965–1981
• Made in: UK
• Wattage: 50W
• Channels: 2
• Preamp tubes: 4× ECC83
• Power tubes: 2× EL34

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

Heard on: All Along the Watchtower — Jimi Hendrix (1968); Won't Get Fooled Again — The Who (1971).

Tags: british, plexi, vintage, 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.