Bogen Challenger CH60 preset

Verified · 90/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Bogen Challenger CH60 is a 60-watt tube PA amplifier with two microphone inputs and a phono input. Both mic inputs use identical 6SF5 preamp stages with their own volume controls, feeding a shared 6SL7 stage with Bogen's Selectone tone control, and a pair of 807 beam tetrodes in the output. It was built for commercial and institutional sound, and players now use its octal-tube circuit as a clean, loud guitar platform.

• Made in: USA
• Wattage: 60W
• Channels: 1
• Preamp tubes: 2× 6SF5, 1× 6SL7GT, 1× 6V6GT
• Power tubes: 2× 807

Tags: american, vintage, 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.