Ampeg B2RE / SVT-450H preset

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

The Ampeg B2RE is a solid-state rack bass head from the St. Louis Music era. Its op-amp preamp has gain, Ultra Mid, bass, treble and master controls, a 9-band graphic EQ with bypass, a switchable limiter, a -15 dB input pad, an effects loop and a line out.

• Years produced: 2005–2019
• Wattage: 450W
• Channels: 1

Tags: american, bass, solid-state, 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.