Marshall Valvestate 80 8080/8100 - Boost (Crunch/OD) preset

Verified · 82/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Marshall Valvestate 80 and 100 (models 8080, 8100, and 8412 cabinet) represent the upper tier of the first-generation Valvestate range, delivering 80W or 100W of solid-state power through a valve-preamp front end. The 8412 is the matching 4×12 cabinet that paired with the 8100 head to create a full Valvestate stack, a budget-friendly alternative to the full JCM800 or JCM900 stack that still delivered substantial stage presence. The ECC83 preamp stage gives the series its distinctive voice, and at these power levels the Valvestate could hold its own against valve amps in live band situations.

• Years produced: 1991–2000
• Made in: UK
• Channels: 2
• Preamp tubes: 1× ECC83 (12AX7)
• Power tubes: Solid-state

Tags: british, crunch.

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.