FBT 120 preset

Close · 76/100 confidence. Most values readable. Minor gaps filled by inference from similar circuits.

The FBT Model 120 is a small Italian tube guitar amp with tremolo. Two inputs feed two triode gain stages with a volume and a tone control between them, and a single-triode split-load phase inverter drives a cathode-biased push-pull pair of small seven-pin output pentodes, with negative feedback from the speaker. A fourth triode runs a phase-shift tremolo with a speed control and an on/off switch, and a valve rectifier supplies the amp.

• Made in: Italy
• Channels: 1
• Preamp tubes: 12AX7
• Power tubes: 2× 6AQ5

Tags: italian, vintage, clean, tremolo, low-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.