What tubes does the Ampeg J-12B Jet - Main use?

The Ampeg J-12B Jet - Main uses 3× 12AX7 preamp tubes and 2× 6L6 power tubes.

When was the Ampeg J-12B Jet - Main produced?

The Ampeg J-12B Jet - Main was produced 1959–1963.

Ampeg J-12B Jet - Main preset

Verified · 88/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The J-12B Jet is an early Ampeg guitar combo from the early 1960s, part of the popular Jet series. Its 15-watt 6L6 circuit produces warm, clean tones with good note definition. The Jet series were among Ampeg's primary guitar offerings before the company shifted focus toward bass amplification.

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.