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

The Ampeg EJ-12D - Main uses 3× 12AX7 preamp tubes and 2× 7591A power tubes.

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

The Ampeg EJ-12D - Main was produced 1962–1966.

Ampeg EJ-12D - Main preset

Close · 72/100 confidence. Most values readable. Minor gaps filled by inference from similar circuits.

The EJ-12D is a later version of the Echo Jet series with 7591A output tubes. The Main circuit delivers warm, midrange-focused tone with built-in echo. The D suffix indicates a revised circuit or cosmetic update. The 7591A tubes provide slightly different harmonic characteristics compared to the 6L6-equipped EJ-12A.

Years produced: 1962–1966
Made in: USA
Wattage: 18W
Channels: 2
Preamp tubes: 3× 12AX7
Power tubes: 2× 7591A

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.