What tubes does the Ampeg Jet J-12-B (6V6 version) - Main use?

The Ampeg Jet J-12-B (6V6 version) - Main uses 3× 12AX7 preamp tubes and 2× 6V6 power tubes.

When was the Ampeg Jet J-12-B (6V6 version) - Main produced?

The Ampeg Jet J-12-B (6V6 version) - Main was produced 1959–1963.

Ampeg Jet J-12-B (6V6 version) - Main preset

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

The Jet J-12-B with 6V6 output tubes is the standard version of this popular early Ampeg guitar combo. The Main circuit delivers vintage late-1950s American tone with the warm, slightly compressed character of 6V6 tubes. The Jet J-12-B was one of Ampeg's most popular guitar models before the company's bass market focus intensified.

Years produced: 1959–1963
Made in: USA
Wattage: 15W
Channels: 2
Preamp tubes: 3× 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.