Fender Showman AB763 - Normal preset

Verified · 97/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Fender Showman AB763 is a high-powered piggyback head designed for large stage use, built around the same blackface circuit topology as Fender's combo lineup but delivering more clean headroom for bass and guitar. Originally developed at the request of bassist Bob Bogle of The Ventures, it became a workhorse for players needing clean volume at scale. The AB763 version features the standard blackface two-channel layout with vibrato.

• Years produced: 1963–1967
• Made in: USA
• Wattage: 85W
• Channels: 2
• Preamp tubes: 4× 12AX7, 1× 12AT7
• Power tubes: 2× 6L6

Known for: Bob Bogle.

Tags: american, clean, vintage.

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.