FBT 250 / 250 LB - Main preset

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

The FBT 250 and 250 LB are high-powered solid-state amplifiers from this Italian manufacturer, with the LB variant specifically tuned for bass guitar performance. Both models deliver substantial clean power reflecting FBT's professional audio engineering pedigree.

• Years produced: 1970s–1980s
• Made in: Italy
• Wattage: 250W
• Channels: 1

Tags: modern, solid-state, clean.

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.