What tubes does the Ampeg GU-12 - Normal use?

The Ampeg GU-12 - Normal uses 2× 12AX7 preamp tubes and 2× 6V6 power tubes.

When was the Ampeg GU-12 - Normal produced?

The Ampeg GU-12 - Normal was produced 1962–1966.

Ampeg GU-12 - Normal preset

Close · 78/100 confidence. Most values readable. Minor gaps filled by inference from similar circuits.

The GU-12 Normal channel provides an alternate schematic for Ampeg's compact 6V6-based guitar combo. Warm, vintage American tone in a budget-friendly package. An alternate documentation source complementing the primary GU-12 schematic.

Years produced: 1962–1966
Made in: USA
Wattage: 12W
Channels: 2
Preamp tubes: 2× 12AX7
Power tubes: 2× 6V6

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.