What tubes does the Marshall JCM800 1987 - High Treble use?

The Marshall JCM800 1987 - High Treble uses 3× ECC83 preamp tubes and 2× EL34 power tubes.

When was the Marshall JCM800 1987 - High Treble produced?

The Marshall JCM800 1987 - High Treble was produced 1981–1990.

Marshall JCM800 1987 - High Treble preset

Verified · 93/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The JCM800-era 1987 is the 50-watt Lead head with no master volume, carrying the plexi-style four-input, two-channel layout into the JCM800 cosmetics. Two EL34s and a simple preamp mean it has to be turned up to break up, rewarding dynamic playing and guitar volume control.

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

Tags: british, crunch, plexi, el34, mid-wattage, two-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.