Ampeg PB250 preset

Close · 68/100 confidence. Most values readable. Minor gaps filled by inference from similar circuits.

The Ampeg PB250 is a 250-watt Class D bass amplifier. A MOSFET H-bridge output stage is controlled by op-amp and comparator circuitry, with an optical limiter and protection circuits.

• Years produced: 2002–2004
• Made in: USA
• Wattage: 250W
• 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.