Oliver Powerflex P-502 - Channel 1 preset

Verified · 90/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Powerflex P-502 belongs to Oliver Sound's Powerflex line, combos whose chassis rose out of the cabinet on a motorized lift; Oliver Sound was run by former Ampeg engineer Jess Oliver. Channel 1 has volume, bass and treble; Channel 2 has treble, bass, mid-range, an ultra-high switch and volume, plus tremolo and spring reverb. A 6AN8 inverter drives two fixed-bias 7027As, with a 5AR4 rectifier. The P-500 is the same amp without reverb and tremolo.

• Made in: USA
• Wattage: 60W
• Channels: 2
• Preamp tubes: 3× 6EU7, 1× 6DR7, 1× 6AN8
• Power tubes: 2× 7027A

Tags: american, vintage, two-channel.

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.