Vox Mark III Preamp (Conqueror/Defiant/Supreme) - Brilliant preset

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

The Berkeley Preamp is the solid-state preamp section of the Vox Berkeley series from the late 1960s. This schematic covers the transistor preamp circuit used in the Berkeley line.

• Years produced: 1966–1970
• Made in: UK
• Channels: 2
• Preamp tubes: 0
• Power tubes: solid-state

Tags: british, solid-state, vintage, preamp.

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.