Marshall Jmp Pa 50W 1963 preset

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

The Marshall 1963 PA 50W is a four-channel public address head that shares its chassis and power stage with the Super Lead family. Each of the four channels is independently controlled, making it useful for small venue PA reinforcement for vocals, acoustic guitars, and keyboards. Like many Marshall PA heads of the era, it was quickly adopted by guitarists who appreciated its multi-input architecture and the ability to blend channels for unique tonal combinations. The 1963's warm EL34 sound and responsive feel made it a practical and musical choice well beyond its original PA purpose.

Tags: british, 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.