Ampeg Heritage B-15 - Normal preset

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

The Heritage B-15 is a faithful hand-wired reissue of the classic B-15N PortaFlex, built in the USA to vintage specifications. The flip-top cabinet design and point-to-point construction recreate the warm, punchy tone that graced countless Motown and soul recordings. Ideal for recording and small-venue bass.

• Years produced: 2014–present
• Made in: USA
• Wattage: 25W
• Channels: 1
• Preamp tubes: 2× 12AX7
• Power tubes: 2× 6L6

Known for: James Jamerson, Bob Babbitt.

Heard on: What's Going On — Marvin Gaye (1971).

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

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.