Ampeg B-15N - Channel No. 2 preset

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

The B-15N Channel No. 1 is the primary input of Ampeg's iconic flip-top bass combo. The B-15N is the single most important bass amplifier in recording history, used on more hit records than any other bass amp in the 1960s and 1970s. Its warm, punchy 30W tone defined the sound of popular music for a generation.

• Years produced: 1960–1969
• Made in: USA
• Wattage: 30W
• Channels: 2
• Preamp tubes: 3× 12AX7
• Power tubes: 2× 6L6

Known for: James Jamerson, Bob Babbitt, Carol Kaye.

Heard on: What's Going On — Marvin Gaye (1971); My Girl — The Temptations (1964); I Can't Help Myself — The Four Tops (1965).

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.