Vox Virtuoso Power Stage - Main preset

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

The Vox Virtuoso Power Stage uses four KT88 tubes to deliver 100 watts, making it one of the most powerful tube amplifiers in the mid-1960s Vox lineup. It was designed for the largest stages of the era.

• Years produced: 1965–1968
• Made in: UK
• Wattage: 100W
• Channels: 1
• Preamp tubes: 2× ECC83
• Power tubes: 4× KT88

Tags: british, kt88, vintage, power-amp, high-headroom.

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.