Vox AC30 Top Boost (Dallas Arbiter) - Brilliant preset

Verified · 82/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

This AC30 Top Boost comes from the Dallas Arbiter period of Vox in the 1970s and keeps the classic three-channel circuit. Brilliant, Normal and Vib/Trem inputs each have their own volume, with Top Boost Treble and Bass on the Brilliant channel. An ECC83 oscillator and ECC82 modulator give vibrato or tremolo (Speed, Depth, footswitch). A Cut control and ECC83 long-tailed pair drive four cathode-biased EL84s on a solid-state rectifier.

• Made in: UK
• Wattage: 30W
• Channels: 3
• Preamp tubes: 5× ECC83, 1× ECC82
• Power tubes: 4× EL84

Tags: british, vintage, el84, class-a, top-boost, multi-channel.

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.