Fender Bronco AB764 preset

Verified · 90/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The AB764 Bronco is a single-ended class A student combo based on the Vibro Champ. A 12AX7A two-stage preamp with bass and treble controls and a 12AX7A vibrato oscillator drive one 6V6GTA on a 5Y3GT rectifier, for about 6 watts that break up easily.

• Made in: USA
• Wattage: 6W
• Channels: 1
• Preamp tubes: 2× 12AX7A
• Power tubes: 1× 6V6GTA

Tags: american, vintage, vibrato, 6v6, class-a, low-wattage, practice.

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.