Mesa Boogie Mark II preset

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

The Mark II refined the original Boogie formula with more gain stages and improved channel switching. The IIA and IIB variants pushed gain further while retaining the tight, focused low-end that distinguished Mesa from its contemporaries.

• Years produced: 1978–1984
• Made in: USA
• Wattage: 100W
• Channels: 2
• Preamp tubes: 5× 12AX7
• Power tubes: 4× 6L6

Known for: Carlos Santana.

Tags: american, high-gain, vintage, mark-series.

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.