What tubes does the Ampeg B-15T - Channel 1 use?

The Ampeg B-15T - Channel 1 uses 3× 12AX7 preamp tubes and 2× 6L6 power tubes.

When was the Ampeg B-15T - Channel 1 produced?

The Ampeg B-15T - Channel 1 was produced 1965–1969.

Ampeg B-15T - Channel 1 preset

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

The B-15T is a PortaFlex variant with a specific circuit revision denoted by the T suffix. Channel 1 delivers the classic warm, punchy bass tone of the B-15N family. The T designation may indicate a different output transformer specification or a minor circuit revision in the bias or driver stage.

Years produced: 1965–1969
Made in: USA
Wattage: 30W
Channels: 2
Preamp tubes: 3× 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.