What tubes does the Ampeg EJ-12A - Main use?

The Ampeg EJ-12A - Main uses 3× 12AX7 preamp tubes and 2× 6L6 power tubes.

When was the Ampeg EJ-12A - Main produced?

The Ampeg EJ-12A - Main was produced 1961–1965.

Ampeg EJ-12A - Main preset

Verified · 83/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The EJ-12A Echo Jet is an early Ampeg guitar combo with built-in echo effect, combining the clean 6L6 tone of the Jet series with atmospheric echo. The main circuit provides warm American guitar tone while the echo circuit adds trails characteristic of early tape or spring echo designs of the early 1960s.

Years produced: 1961–1965
Made in: USA
Wattage: 15W
Channels: 2
Preamp tubes: 3× 12AX7
Power tubes: 2× 6L6

Tags: guitar, american, vintage, low-wattage, reverb, 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.