Ampeg AP-3550 - Main preset

Verified · 80/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The AP-3550 is a high-powered solid-state bass power amplifier delivering 350 watts for professional touring use. The Main channel provides clean, transparent bass amplification intended to be paired with separate tube preamps. The AP-3550 was part of Ampeg's professional rack-mount system lineup.

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

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.