Ampeg G-18 preset

Verified · 90/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Ampeg G-18 is a small solid-state practice amp for guitar. Two inputs feed a single transistor gain stage, then passive bass and treble controls and a volume, followed by a transistor driver and a complementary output pair. The output is capacitor-coupled to an 8-ohm speaker from a single 34-volt bridge-rectified supply, a simple circuit built for home practice rather than the stage.

• Made in: USA
• Wattage: 18W
• Channels: 1

Tags: american, 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.