Marshall Major 1967U Lead 200W preset

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

The Marshall Major 1967 Lead 200W is the guitar-voiced version of the 200W Major chassis, delivering the Super Lead's characteristic mid-forward voicing through a KT88 output stage capable of 200 watts. At full volume the Major is a genuinely fearsome instrument, capable of filling any arena without PA support. Its sheer output made it the head of choice for players who needed to project across enormous stages during the early years of stadium rock, and its KT88 power section gives it a unique character — tighter in the low end and slightly harder in the midrange compared to EL34-based Marshalls.

• Years produced: 1967–1975
• Made in: UK
• Wattage: 200W
• Channels: 2
• Preamp tubes: 3× ECC83 (12AX7)
• Power tubes: 4× KT88

Known for: Ritchie Blackmore, Pete Townshend.

Tags: british, crunch, high-gain.

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.