What tubes does the Ampeg Heritage B-15 use?

The Ampeg Heritage B-15 uses 3× 6SL7 preamp tubes and 2× 6L6GC power tubes.

When was the Ampeg Heritage B-15 produced?

The Ampeg Heritage B-15 was produced 2011–2012.

Ampeg Heritage B-15 preset

Verified · 92/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Ampeg Heritage B-15 is a modern tube reissue of the Portaflex bass combo with two channels voiced after the 1964 and 1966 circuits. Each has two inputs and its own volume, bass and treble around a full 6SL7, and both mix into a third 6SL7 that provides gain and phase splitting for a fixed-bias pair of 6L6GCs. A 1964/1966 bias switch, a choke-filtered supply on a 5AR4 or 5U4G rectifier and an external amp jack complete it.

Years produced: 2011–2012
Made in: USA
Wattage: 30W
Channels: 2
Preamp tubes: 3× 6SL7
Power tubes: 2× 6L6GC

Tags: american, reissue, bass, 6l6, two-channel, mid-wattage.

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.