Marshall Valvestate 120/120 Power Amp preset

Verified · 84/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Valvestate 120/120 is a 2x120-watt solid-state stereo rack power amp from 1996-97, built to pair with Marshall's rack preamps. Each side has its own input (A can run mono), Volume, Presence, Resonance and impedance selector, with relay-switched Valvestate and Dimension modes that shape the feedback for a more valve-like response, each remote-switchable. Discrete transistor power stages drive left and right speaker outputs, with clip LEDs.

• Made in: UK
• Wattage: 240W
• Channels: 1

Known for: Billy Gibbons.

Tags: british, solid-state, power-amp, stereo.

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.