What tubes does the Mesa Boogie Mark III use?

The Mesa Boogie Mark III uses 5× 12AX7 preamp tubes and 4× 6L6 power tubes.

When was the Mesa Boogie Mark III produced?

The Mesa Boogie Mark III was produced 1985–1999.

Mesa Boogie Mark III preset

Verified · 89/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Mark III carried Mesa/Boogie's cascaded-gain voice into the late 1980s. The Rhythm channel has Volume 1, treble, bass and middle with bass shift and full bright, plus a relay-switched Rhythm 2 gain boost on the same volume; the Lead channel cascades two more 12AX7 stages with its own Lead Drive and Lead Master. A five-band graphic EQ, spring reverb and Simul-Class power, running output valves in class A and class AB together, complete it.

Years produced: 1985–1999
Made in: USA
Wattage: 100W
Channels: 2
Preamp tubes: 5× 12AX7
Power tubes: 4× 6L6

Tags: american, high-gain, crunch, 6l6, high-wattage, 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.