Fender Twin-Amp 5F8-A preset

Verified · 91/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The 5F8-A is the revised high-powered tweed Twin, swapping the 5F8's '83 mercury-vapor rectifier for a GZ34. Four 5881 output tubes deliver about 80 watts, with presence, middle, bass and treble controls across its Bright and Normal channels.

• Years produced: 1958–1960
• Made in: USA
• Wattage: 80W
• Channels: 2
• Preamp tubes: 1× 12AY7, 2× 12AX7
• Power tubes: 4× 5881

Known for: Keith Richards, Joe Bonamassa.

Tags: american, vintage, tweed, clean, high-wattage, 6l6.

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.