Premier 50 preset

Close · 78/100 confidence. Most values readable. Minor gaps filled by inference from similar circuits.

This Ceriatone Plexi 50 Bass is a boutique recreation of the classic Marshall Plexi 50 circuit, specifically voiced with the bass input channel topology of the late-1960s Marshall Super Lead. Ceriatone builds faithful circuit reproductions of legendary vintage amplifiers, and the Plexi 50 Bass captures the darker, thicker tone of the bass input channel favored by many British rock guitarists. The KT66 output stage provides the warm, round character of the earliest Marshall 50-watt designs.

Tags: british, vintage, crunch.

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.