What tubes does the Jennings Musical Industries AC4 use?

The Jennings Musical Industries AC4 uses 1× ECC83 preamp tubes and 1× EL84 power tubes.

When was the Jennings Musical Industries AC4 produced?

The Jennings Musical Industries AC4 was produced 1960–1966.

Jennings Musical Industries AC4 preset

Close · 75/100 confidence. Most values readable. Minor gaps filled by inference from similar circuits.

The JMI/Vox AC4 was a miniature version of the legendary AC series, producing 4 watts of chiming EL84-driven British tone in a compact practice combo format. Its simple circuit and single EL84 output tube deliver naturally compressed, harmonically rich overdrive at low volume levels — a design later revived by Vox multiple times.

Years produced: 1960–1966
Made in: UK
Wattage: 4W
Channels: 1
Preamp tubes: 1× ECC83
Power tubes: 1× EL84

Tags: british, vintage, crunch, clean.

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.