Webster Electric 89D50 preset

Close · 70/100 confidence. Most values readable. Minor gaps filled by inference from similar circuits.

The Webster Electric 89D50 is a 50-watt tube public-address amplifier built around four 6L6GB output tubes in push-pull, driven by a paraphase inverter. Its preamp uses 5879 low-noise pentodes plus a 6SJ7 and 6SN7, with a 5U4GB rectifier. Like many vintage PA heads it is a popular candidate for conversion into a big, clean, headroom-heavy guitar amp.

• Made in: USA
• Wattage: 50W
• Channels: 1
• Preamp tubes: 3× 5879, 1× 6SJ7, 1× 6SN7
• Power tubes: 4× 6L6GB

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

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.