Music Man GB-2 150W - Channel 1 preset

Verified · 88/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Music Man GB2 is a guitar and bass dual-use combo from the mid-1970s, designed to serve as a versatile rehearsal and studio amplifier for both instruments. It uses a solid-state preamp circuit with ample clean headroom and a straightforward EQ section. The GB2 represents Music Man's effort to serve the broader rehearsal-space and home-studio market.

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.