Ampeg PB250 Bass Amp - Main preset

Close · 72/100 confidence. Most values readable. Minor gaps filled by inference from similar circuits.

The Ampeg PB-250 was a solid-state bass amplifier head producing 250 watts, part of Ampeg's late-1970s and 1980s professional bass amplification range. Available in (A) and (B) revisions, it offered a clean, high-headroom solid-state sound with a parametric or semi-parametric EQ section for broad tonal shaping. The PB-250 was designed for players who needed reliable, high-power performance without the weight of tube amplifiers.

Tags: american.

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.