Fender Vibroverb AB763 preset

Verified · 92/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The blackface Vibroverb was made only in 1964. It replaced the brownface 2×10 Vibroverb with a 1×15 combo using the blackface two-channel circuit: Normal and Vibrato channels, each with two inputs, volume, treble, bass and a bright switch, with spring reverb and optical vibrato on the Vibrato channel. A 12AT7 inverter drives a fixed-bias pair of 6L6GCs from a GZ34 rectifier. Stevie Ray Vaughan used a pair of 1964 Vibroverbs as main amps, which made it one of the most sought-after vintage Fenders.

• Years produced: 1964
• Made in: USA
• Wattage: 40W
• Channels: 2
• Preamp tubes: 4× 12AX7, 2× 12AT7
• Power tubes: 2× 6L6GC

Known for: Stevie Ray Vaughan.

Heard on: Pride and Joy — Stevie Ray Vaughan & Double Trouble (1983).

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

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.