What tubes does the Music Man Gb 2 - Ch2 use?

The Music Man Gb 2 - Ch2 uses 2× 12AX7 preamp tubes.

When was the Music Man Gb 2 - Ch2 produced?

The Music Man Gb 2 - Ch2 was produced 1976–1982.

Music Man Gb 2 - Ch2 preset

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

The Music Man GB-2 was a high-powered bass combo delivering 150 watts of clean, full-range bass amplification through a tube preamp and solid-state power section. It was Music Man's flagship bass amplifier, offering professional-grade bass tone to match the company's guitar amp lineup.

Years produced: 1976–1982
Made in: US
Wattage: 150W
Channels: 2
Preamp tubes: 2× 12AX7

Tags: american, vintage, bass, clean.

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.