Mesa Boogie Mark IIA preset

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

The Mark IIA was the first significant evolution of the original Boogie, introducing proper channel switching and more refined gain staging. It brought greater versatility and stronger lead tones while retaining the warm, focused character that defined the Mark series.

• Years produced: 1978–1981
• 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.