What tubes does the Ampeg B-15S Portaflex - Normal use?

The Ampeg B-15S Portaflex - Normal uses 2× 12AX7 preamp tubes and 2× 6L6 power tubes.

When was the Ampeg B-15S Portaflex - Normal produced?

The Ampeg B-15S Portaflex - Normal was produced 1971–1974.

Ampeg B-15S Portaflex - Normal preset

Verified · 85/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Ampeg B-15S Portaflex brought the iconic flip-top bass combo format into the early 1970s with increased wattage to meet the demands of louder stages. While the original B-15N had defined studio recording, the B-15S extended the Portaflex legacy for live performance, delivering the characteristic Ampeg warmth and roundness at higher output levels. It retains the signature Portaflex aesthetics and construction quality of its predecessors.

Years produced: 1971–1974
Made in: USA
Wattage: 60W
Channels: 1
Preamp tubes: 2× 12AX7
Power tubes: 2× 6L6

Tags: american, vintage, clean.

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.