Ampeg B-50 preset

Verified · 86/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Ampeg B-50 is a solid-state bass combo from the Music Technology Inc. era, when Ampeg was based in Garden City Park, New York. Hi and Lo inputs feed a JFET stage and a passive Treble, Bass and Mid network with a 200/400 Hz Mid Shift switch, then Volume, a second JFET stage and a second Bass control. Discrete transistor drivers feed a complementary output pair into an 8-ohm speaker, with line out and headphone jacks.

• Made in: USA
• Wattage: 50W
• Channels: 1

Tags: american, bass, solid-state, mid-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.