Vox Tbmod preset

Verified · 85/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Top Boost Mod is the preamp add-on circuit fitted to the AC30/6 and AC36, adding treble and bass controls plus a high-gain input stage. It defines the classic Vox bright, chiming tone and is the most recognizable aspect of the AC30 Top Boost sound.

• Years produced: 1961–present
• Made in: UK
• Channels: 1
• Preamp tubes: 1× ECC83

Known for: The Beatles, The Edge, Brian May.

Tags: british, el84, chime, top-boost, 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.