What tubes does the Ampeg B-12XY - Ch4 use?

The Ampeg B-12XY - Ch4 uses 4× 12AX7 preamp tubes and 2× 6L6 power tubes.

When was the Ampeg B-12XY - Ch4 produced?

The Ampeg B-12XY - Ch4 was produced 1965–1969.

Ampeg B-12XY - Ch4 preset

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

The B-12XY is a multi-channel Ampeg bass amplifier with four independent input channels sharing the 6L6 output stage. Ch4 provides one of the instrument input paths. The XY multi-channel design was aimed at recording studios or venues requiring multiple simultaneous bass inputs from the same amplifier.

Years produced: 1965–1969
Made in: USA
Wattage: 22W
Channels: 4
Preamp tubes: 4× 12AX7
Power tubes: 2× 6L6

Tags: bass, american, vintage, low-wattage, clean, studio.

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.