Mesa Boogie Mark IV - Rhythm 1 preset

Verified · 85/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Mark IV is one of Mesa Boogie's most versatile amplifiers, offering four channels with independent EQ and extensive switching options. It spans pristine cleans to searing high-gain lead tones and was a studio staple for nearly two decades.

• Years produced: 1990–2008
• Made in: USA
• Wattage: 100W
• Channels: 4
• Preamp tubes: 5× 12AX7
• Power tubes: 4× 6L6

Known for: John Petrucci, Carlos Santana.

Heard on: Pull Me Under — Dream Theater (1992).

Tags: american, high-gain, versatile, 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.