Marshall 1962Ri93 preset

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

The Marshall 1962 Bluesbreaker is a 2×12 combo built around the JTM45 circuit, famously used by Eric Clapton on the John Mayall 'Beano' album in 1966. Its warm, cutting midrange became the template for 'woman tone' and British blues lead playing.

• Years produced: 1965–1966
• Made in: UK
• Wattage: 45W
• Channels: 2
• Preamp tubes: 3× ECC83
• Power tubes: 2× KT66

Known for: Eric Clapton.

Heard on: Hideaway — John Mayall & the Bluesbreakers (1966).

Tags: british, blues, vintage, combo.

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.