Fender Vibroverb AA763 - Vibrato preset

Verified · 91/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Vibroverb AA763 is the blackface Vibroverb, a 1×15 combo with Normal and Vibrato channels, spring reverb and optical vibrato. Two 6L6GC tubes on a GZ34 rectifier give about 40 watts. Its lush reverb and vibrato made it a Stevie Ray Vaughan favorite.

• Years produced: 1963–1964
• Made in: USA
• Wattage: 40W
• Channels: 2
• Preamp tubes: 3× 7025, 1× 12AX7, 2× 12AT7
• Power tubes: 2× 6L6GC

Known for: Stevie Ray Vaughan.

Tags: american, vintage, blackface, clean, reverb, vibrato, 6l6.

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.