Bogen J-330 - Main preset

Verified · 82/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Bogen J-330 is a tube PA amplifier from this respected American commercial audio manufacturer, built for public address and instrument amplification applications in the 1950s and 1960s. Bogen was a leading producer of institutional and commercial audio equipment, and models like the J-330 were widely found in schools, churches, and venues of the era. These PA amps have since been repurposed by guitarists and vintage audio enthusiasts for their warm, characterful tube tone.

Tags: american, vintage.

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.