What tubes does the Mesa Boogie 50 Caliber use?

The Mesa Boogie 50 Caliber uses 4× 12AX7 preamp tubes and 2× 6L6 power tubes.

When was the Mesa Boogie 50 Caliber produced?

The Mesa Boogie 50 Caliber was produced 1984–1993.

Mesa Boogie 50 Caliber preset

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

The 50 Caliber is a 50-watt combo that bridges the gap between the smaller 22 Caliber and the full-sized Mark series heads. It delivers boutique Mesa tone in a manageable format and was popular for smaller venues and home recording.

Years produced: 1984–1993
Made in: USA
Wattage: 50W
Channels: 2
Preamp tubes: 4× 12AX7
Power tubes: 2× 6L6

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

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.