What tubes does the Marshall JCM800 Super Bass 1992 use?

The Marshall JCM800 Super Bass 1992 uses 3× ECC83 preamp tubes and 4× EL34 power tubes.

When was the Marshall JCM800 Super Bass 1992 produced?

The Marshall JCM800 Super Bass 1992 was produced 1981–1990.

Marshall JCM800 Super Bass 1992 preset

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

The JCM800-era 1992 Super Bass is a 100-watt valve bass head, shown in its 1981 form. High and Low inputs feed an ECC83 stage with Middle and a Mid Sweep control, then a single Volume, a further gain stage and cathode follower into a Baxandall-style Bass and Treble stack and a second gain stage. An ECC83 long-tail inverter with Presence drives four EL34s (KT77 or 6550 on some versions) off a silicon bridge and choke.

Years produced: 1981–1990
Made in: UK
Wattage: 100W
Channels: 1
Preamp tubes: 3× ECC83
Power tubes: 4× EL34

Tags: british, bass, el34, high-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.