Mesa Boogie Mark III - Rhythm 2 preset

Close · 65/100 confidence. Most values readable. Minor gaps filled by inference from similar circuits.

The Mark III introduced three channels and Simul-Class power — simultaneously running tubes in Class A and Class AB — giving it both headroom and harmonic richness. It was Mesa's most sophisticated amp of the 1980s and a major influence on progressive and hard rock.

• Years produced: 1985–1990
• Made in: USA
• Wattage: 100W
• Channels: 3
• Preamp tubes: 5× 12AX7
• Power tubes: 4× 6L6

Known for: Carlos Santana, John Petrucci.

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

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.