Versatone Pan-O-Flex 133 preset

Close · 78/100 confidence. Most values readable. Minor gaps filled by inference from similar circuits.

The Pan-O-Flex 133 is the bi-amplified tube amp built by Electronic Music Co. of Van Nuys, California. High- and Low-Gain inputs feed a two-stage 7025 preamp with Volume and a Bright switch; the signal then splits into treble and bass paths, each with its own control, 7025 phase inverter and push-pull pair of 7591A output tubes, with a Balance control between them. It became a studio bass favourite.

• Made in: USA
• Wattage: 35W
• Channels: 1
• Preamp tubes: 3× 7025
• Power tubes: 4× 7591A

Known for: Carol Kaye, Jack Casady.

Heard on: Hesitation Blues — Hot Tuna (1970).

Tags: american, vintage, bass, 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.