Mesa Boogie Mark I preset

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

The Mark I is the original Boogie: Randall Smith's hot-rodded design that added cascaded gain stages to a Fender-style circuit, giving the singing sustain Carlos Santana made famous. This version has four 6L6GCs, two inputs with independent volumes, a footswitchable lead boost, master volume and an optional 5-band graphic EQ.

• Years produced: 1972–1978
• Made in: USA
• Wattage: 100W
• Channels: 1
• Preamp tubes: 3× 12AX7, 1× 12AT7
• Power tubes: 4× 6L6GC

Known for: Carlos Santana, Keith Richards, Larry Carlton.

Heard on: Angel of Sunlight — Carlos Santana & Alice Coltrane (1974); Mannish Boy (Live) — The Rolling Stones (1977); Room 335 — Larry Carlton (1978); Repulsion — Dinosaur Jr. (1985).

Tags: american, vintage, high-gain, 6l6, high-wattage.

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.