What tubes does the Ampeg Jet J12B Amp use?

The Ampeg Jet J12B Amp uses 3× 12AX7 preamp tubes and 2× 6L6 power tubes.

When was the Ampeg Jet J12B Amp produced?

The Ampeg Jet J12B Amp was produced 1959–1963.

Ampeg Jet J12B Amp preset

Verified · 85/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Jet J-12B is a second-generation Jet series guitar combo, upgrading from 6V6 to 6L6 output tubes for more headroom and fuller tone. The Normal channel feeds a clean, chimey circuit well-suited to country, rock and roll, and jazz applications. The J-12B represents the evolution of the Jet design through the early 1960s.

Years produced: 1959–1963
Made in: USA
Wattage: 15W
Channels: 2
Preamp tubes: 3× 12AX7
Power tubes: 2× 6L6

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.