Fender Showman AB763 - Vibrato preset

Verified · 93/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The blackface Showman is Fender's big piggyback head with Normal and Vibrato channels and no reverb, built in Single (1×15) and Dual (2×15) Showman versions. Each channel has two inputs, volume, treble, bass and a bright switch, and the Vibrato channel adds a middle control and optical vibrato with speed and intensity. A 12AT7 inverter drives four fixed-bias 6L6GCs from a silicon rectifier. The Showman line grew out of Leo Fender's work with Dick Dale on an amp that could survive his volume.

Tags: american, vintage, blackface, vibrato, 6l6, high-wattage, 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.