Bogen JX30 preset

Verified · 80/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The JX30 is a 1950s Bogen 30-watt tube PA amplifier built on octal tubes: four 6SF5 microphone preamps and a phono input feed a 6SC7 mixer, tone and amplifier stages, a 6SL7 phase inverter and a push-pull pair of 6L6GTs on a 5U4G rectifier. Its multiple mic channels and big 6L6 output stage make it a sought-after base for harmonica and guitar conversions.

• Made in: USA
• Wattage: 30W
• Channels: 1
• Preamp tubes: 5× 6SF5, 2× 6SC7, 1× 6SL7
• Power tubes: 2× 6L6GT

Tags: american, vintage, 6l6, mid-wattage.

Schematic-derived preset files for the Neural DSP Quad Cortex and 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.