What tubes does the Mesa Boogie Express 525/550 use?

The Mesa Boogie Express 525/550 uses 3× 12AX7 preamp tubes and 2× 6L6 power tubes.

When was the Mesa Boogie Express 525/550 produced?

The Mesa Boogie Express 525/550 was produced 2006–present.

Mesa Boogie Express 525/550 preset

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

The Express 5:25/5:50 is a switchable-wattage combo offering 5, 25, or 50 watts. It covers clean and lead tones in a compact format, with independent channel voicings drawn from Mesa's Mark series heritage.

Years produced: 2006–present
Made in: USA
Wattage: 50W
Channels: 2
Preamp tubes: 3× 12AX7
Power tubes: 2× 6L6

Tags: american, versatile, switchable-wattage, combo.

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.