What tubes does the Ampeg G-18 - Normal use?

The Ampeg G-18 - Normal uses 3× 12AX7 preamp tubes and 2× 7591A power tubes.

When was the Ampeg G-18 - Normal produced?

The Ampeg G-18 - Normal was produced 1965–1969.

Ampeg G-18 - Normal preset

Verified · 82/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The G-18 is an Ampeg guitar combo from the mid-1960s using 7591A output tubes. The Normal channel delivers warm, midrange-focused tone characteristic of Ampeg's 7591A-based designs. A practical mid-sized combo offering more power and character than the budget models without the weight of the 100-watt VT series.

Years produced: 1965–1969
Made in: USA
Wattage: 18W
Channels: 2
Preamp tubes: 3× 12AX7
Power tubes: 2× 7591A

Tags: guitar, american, vintage, low-wattage, 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.