Webster Electric 82-25 preset

Verified · 85/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

A Webster Electric valve public-address amplifier from around 1951, not a guitar amp. Three microphone inputs each have their own 6J7 pentode preamp and 500k volume, and a phono input has its own volume; they mix into a 6J7 mixer stage, a bass and treble tone network, a 6J5 gain stage and a 6SL7GT driver and phase inverter. A push-pull pair of 6L6Gs drives a multi-tap output transformer, with a 5Z3 rectifier.

• Made in: USA
• Wattage: 25W
• Channels: 1
• Preamp tubes: 4× 6J7, 1× 6J5, 1× 6SL7GT
• Power tubes: 2× 6L6G

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

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.