Marshall JTM45 PA 45W Type 1963 - Channel 2 preset

Verified · 85/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Marshall Super PA 1963 was a four-channel 50W PA amplifier built on the JTM45 platform, intended for use as a vocal public address system but widely adopted by guitarists seeking its clean, open headroom. Jimi Hendrix famously connected multiple PA columns to stacked Super PAs to achieve his massive live sound.

• Years produced: 1963–1973
• Made in: UK
• Wattage: 50W
• Channels: 4
• Preamp tubes: 4× ECC83
• Power tubes: 2× KT66

Known for: Jimi Hendrix.

Tags: british, vintage, pa, plexi.

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.