Vox AC30 Top Boost (1990) preset

Verified · 90/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

This is the Rose-Morris-era AC30 Top Boost Reverb, drawn in November 1990 as the Standard Issue. Normal, Brilliant and Vib/Trem channels each have a volume; the Brilliant channel adds Top Boost treble and bass, the Vib/Trem channel has speed and a vib/trem switch, and a valve spring reverb has its own level and footswitch. A long-tailed pair with a Cut control drives four cathode-biased EL84s with no negative feedback, from a diode bridge.

Tags: british, el84, class-a, reverb, 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.