Ampeg B-2 / B-2R preset

Verified · 90/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The B-2 is a solid-state bass head built around an op-amp preamp with a graphic EQ and a built-in limiter, driving a high-power transistor output stage rated at 350 watts. The B-2R is the rackmount version of the same design, with the same preamp and a revised power amp. Players use it as a light, loud, reliable Ampeg-voiced head for clubs and stages where an all-tube SVT is impractical.

• Wattage: 350W
• Channels: 1

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

Schematic-derived preset files for the Neural DSP Quad Cortex and 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.