What tubes does the Fender Single Showman Ab568 use?

The Fender Single Showman Ab568 uses 3× 12AX7 preamp tubes and 2× 6L6GC power tubes.

When was the Fender Single Showman Ab568 produced?

The Fender Single Showman Ab568 was produced 1966–1969.

Fender Single Showman Ab568 preset

Verified · 80/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Single Showman AB568 is a 85-watt piggyback head from the mid-1960s CBS era, pairing a single 15" JBL-loaded cabinet with a powerful 6L6-driven amplifier section. It was designed as a bass and guitar amp capable of massive headroom and deep, tight low-end response. The AB568 circuit revision added a modified bias arrangement compared to earlier AA763 versions. Its clean, uncolored tone made it a favored workhorse for professional touring musicians who needed reliability and volume.

Years produced: 1966–1969
Made in: USA
Wattage: 85W
Channels: 2
Preamp tubes: 3× 12AX7
Power tubes: 2× 6L6GC

Tags: american, 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.