Ceriatone Plexi 50 Lead (1968) - Normal preset

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

Ceriatone's Plexi 50 '68 Lead follows the late-1960s Marshall 50-watt lead circuit: three ECC83s (two input stages, a gain stage with cathode follower, a long-tail phase inverter) and two EL34s on a solid-state rectifier. Normal and Bright volumes, the Bright with pull-bright, share bass, middle, treble and presence; there is no master volume. It adds an effects loop, a half-power switch and a 4/8/16-ohm selector.

• Made in: Malaysia
• Wattage: 50W
• Channels: 2
• Preamp tubes: 3× ECC83
• Power tubes: 2× EL34

Tags: plexi, el34, crunch, boutique, hand-wired, 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.