Vox AC30 Top Boost (1989) preset

Verified · 84/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The 1989 AC30TB Standard is a Rose-Morris-era AC30 on the classic three-channel layout: Brilliant (Top Boost Treble and Bass), Normal and Vib/Trem, each with its own volume, plus vibrato/tremolo with Speed, a Vib/Trem switch and a footswitch. Unlike the original it adds a valve-driven spring reverb with a footswitch. A Cut control and ECC83 long-tailed pair drive four cathode-biased EL84s with no feedback, on a solid-state rectifier.

• Made in: UK
• Wattage: 30W
• Channels: 3
• Preamp tubes: 8× ECC83
• 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.