Marshall Stereo Chorus Reverb 8280 - Normal preset

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

The 8280 Valvestate Stereo Chorus is a 2x80-watt stereo hybrid combo from 1993. A FET input stage and op-amp preamp, with one ECC83 valve gain stage, feed footswitchable clean and overdrive voices with a Clean/Crunch switch, spring reverb and an effects loop. An MN3007/MN3101 bucket-brigade chorus with speed and depth, switchable by footswitch, spreads the signal across two discrete transistor power amps, with stereo line outputs.

• Made in: UK
• Wattage: 160W
• Channels: 2
• Preamp tubes: 1× ECC83

Tags: british, hybrid, stereo, clean, crunch, reverb, 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.