What tubes does the Marshall JCM800 4104 use?

The Marshall JCM800 4104 uses 3× ECC83 preamp tubes and 2× EL34 power tubes.

When was the Marshall JCM800 4104 produced?

The Marshall JCM800 4104 was produced 1981–1990.

Marshall JCM800 4104 preset

Close · 68/100 confidence. Most values readable. Minor gaps filled by inference from similar circuits.

The JCM800 4104 is the 2×12 combo version of the 50-watt 2204, with the same single-channel master-volume circuit: high and low inputs, cascaded ECC83 gain stages, a cathode-follower tone stack, master volume and presence, and a pair of EL34s on a solid-state supply. It puts the 2204's tight, mid-forward crunch and lead tone into a single cabinet.

Years produced: 1981–1990
Made in: UK
Wattage: 50W
Channels: 1
Preamp tubes: 3× ECC83
Power tubes: 2× EL34

Tags: british, crunch, high-gain, el34, mid-wattage.

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.