What tubes does the Ampeg T-12T - Channel 1 use?

The Ampeg T-12T - Channel 1 uses 3× 12AX7 preamp tubes and 2× 7591A power tubes.

When was the Ampeg T-12T - Channel 1 produced?

The Ampeg T-12T - Channel 1 was produced 1964–1968.

Ampeg T-12T - Channel 1 preset

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

The T-12T is an Ampeg guitar combo from the mid-1960s using 7591A output tubes. Channel 1 provides the standard input path into the warm, midrange-focused 7591A circuit. The T designation indicates a treble-channel configuration variant within Ampeg's mid-1960s lineup.

Years produced: 1964–1968
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.