Mesa Boogie TriAxis - Lead 1 preset

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

The TriAxis is Mesa/Boogie's MIDI-programmable valve rack preamp, first released in 1991. Five 12AX7s provide eight modes that recreate Mark-series rhythm and lead voices, with programmable controls, making it a centrepiece of 1990s rack rigs.

• Years produced: 1991–2016
• Made in: USA
• Channels: 3
• Preamp tubes: 5× 12AX7

Known for: John Petrucci, Reeves Gabrels, Michael Romeo, James Hetfield, Vernon Reid.

Heard on: The Hearts Filthy Lesson — David Bowie (1995).

Tags: american, preamp, high-gain, multi-channel.

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.