Fender Showman Reverb AA768 - Vibrato preset

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

The AA768 is the 1968 Showman Reverb, the first Showman with valve-driven spring reverb, a big silverface piggyback head. Normal and Vibrato channels each have Volume, Treble, Middle, Bass and a bright switch. A 12AT7 drives the reverb with a 7025 recovery, and a 12AX7 runs the optical vibrato with Speed and Intensity. A 12AT7 long-tail phase inverter drives four fixed-bias 6L6GCs on a silicon rectifier for loud, clean Fender tone.

• Made in: USA
• Wattage: 85W
• Channels: 2
• Preamp tubes: 3× 7025, 1× 12AX7, 2× 12AT7
• Power tubes: 4× 6L6GC

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

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.