What tubes does the Ampeg J-12R Diamond Blue - Bright use?

The Ampeg J-12R Diamond Blue - Bright uses 3× 12AX7 preamp tubes and 2× 6L6 power tubes.

When was the Ampeg J-12R Diamond Blue - Bright produced?

The Ampeg J-12R Diamond Blue - Bright was produced 1960–1964.

Ampeg J-12R Diamond Blue - Bright preset

Close · 76/100 confidence. Most values readable. Minor gaps filled by inference from similar circuits.

The J-12R Reverbojet Normal channel schematic documents the clean input path of Ampeg's early reverb-equipped guitar combo in its Diamond Blue cosmetic package. The warm 6L6 tone with spring reverb through the distinctive blue-covered cabinet made the Diamond Blue a visually and sonically appealing vintage piece.

Years produced: 1960–1964
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.