Ampeg PWA Preamp (07S519 / 07-519-12) - Main preset

Close · 75/100 confidence. Most values readable. Minor gaps filled by inference from similar circuits.

The Ampeg PWA preamp (board reference 07S519) is a printed circuit board assembly schematic for a specific Ampeg preamp module, likely from a late-1970s or 1980s solid-state bass amplifier. The part number designation suggests a factory service document used by Ampeg technicians for component-level repair of the preamp board. This type of schematic typically appears in service manuals for the larger Ampeg solid-state head lineup of that era.

• Made in: USA

Tags: american.

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.