Marshall Major 200W - Normal preset

Verified · 82/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Marshall Major is a 200-watt head from the late 1960s, running four KT88 output tubes for enormous clean headroom and volume. It was popular with bass players and with guitarists who wanted a very loud, tight amp, most famously Ritchie Blackmore, whose modified Majors powered Deep Purple in the early 1970s.

• Years produced: 1967–1974
• Made in: UK
• Wattage: 200W
• Channels: 2
• Preamp tubes: 3× ECC83
• Power tubes: 4× KT88

Known for: Ritchie Blackmore, Mick Ronson, John Frusciante.

Heard on: Dani California — Red Hot Chili Peppers (2006).

Tags: british, vintage, kt88, high-wattage, clean, 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.