Fender Single Showman AB568 - Vibrato preset

Close · 79/100 confidence. Most values readable. Minor gaps filled by inference from similar circuits.

The AB568 Single Showman is a late-1960s Fender piggyback head, sold with a single 15-inch cabinet. Normal and Vibrato channels feed a 12AX7 vibrato oscillator and a 12AT7 long-tail phase inverter, driving four 6L6GCs on silicon diodes for about 85 watts of deep, clean headroom for guitar or bass.

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

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