Vox AC30 Top Boost (1986) preset

Verified · 88/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The 1986 AC30 Top Boost comes from the Rose-Morris era of Vox and keeps the classic three-channel layout. 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 with no negative feedback, on a solid-state rectifier.

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

Tags: british, el84, class-a, top-boost, tremolo, 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.