Polytone V1B Preamp preset

Close · 70/100 confidence. Most values readable. Minor gaps filled by inference from similar circuits.

The Polytone V1B preamp was an amplifier preamp circuit designed for use with bass guitars and other instruments demanding clean amplification. Polytone's solid-state designs consistently delivered a smooth, uncolored response perfect for articulate playing styles.

• Years produced: 1980–2000
• Made in: USA
• Channels: 1

Tags: american, solid-state, modern, clean, bass.

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.