Marshall JCM800 Superbass 100W 1992 - Normal preset

Verified · 85/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Marshall JCM800 Superbass 1992 is the 100W bass-specific model from the JCM800 era, sharing the series' single-channel architecture but voiced for bass guitar. Its high headroom and tight low-end response made it a preferred choice for rock bassists throughout the 1980s.

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

Tags: british, bass, jcm800, vintage.

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.