Ampeg Powerflex P-500 / P-502 - Channel 2 preset

Verified · 80/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Powerflex P-500/P-502 is a professional-grade bass amplifier from Ampeg's mid-1960s Powerflex series. Channel 1 delivers clean, powerful bass amplification from four 6L6 output tubes. The Powerflex name indicates a more powerful variant of the PortaFlex design, intended for larger venues and professional touring applications.

• Years produced: 1965–1969
• Made in: USA
• Wattage: 50W
• Channels: 2
• Preamp tubes: 3× 12AX7
• Power tubes: 4× 6L6

Tags: bass, american, vintage, mid-wattage, 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.