Ampeg B-100 / G-100 preset

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

The Ampeg B100 and G100 are small mid-1970s solid-state practice amps from Ampeg's Magnavox era, sharing one circuit with a different speaker: the B100 for bass and the G100 for guitar. Two inputs feed a single transistor preamp stage, then passive Bass and Treble controls and a Volume. A driver and phase-splitting transistors feed a quasi-complementary pair of power transistors on a single 47-volt rail, capacitor-coupled to an 8-ohm speaker.

• Made in: USA
• Channels: 1

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