Vox AC30/6 Bass - Brilliant preset

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

The AC30/6 Bass is the 1964 bass version of the JMI AC30. Bright, Normal and Vib/Trem inputs each have their own volume, with input stages on an ECC83 and a further ECC83 for the Vib/Trem channel; an ECC83 oscillator and ECC82 modulator supply vibrato/tremolo with Speed, a Depth preset and footswitch. An ECC83 long-tailed pair with a tone-cut network drives four cathode-biased EL84s, with no feedback, on a GZ34 rectifier.

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

Tags: british, vintage, el84, bass, class-a, tremolo.

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.