Music Man 120-B preset

Verified · 92/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Music Man 120-B is a 120-watt solid-state bass amplifier. It uses an op-amp preamp with a five-band graphic equalizer (67 Hz to 3.8 kHz) and a built-in limiter, driving a transistor power amp on ±45 V rails. It was built for clean, controlled low end.

Tags: american, solid-state, bass, clean, high-wattage.

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.