Marshall Silver Jubilee 2550 preset

Verified · 94/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The 2550 is the 50-watt head of Marshall's 1987 Silver Jubilee anniversary series. Relay-switched Rhythm and Lead channels share the preamp, a pull Rhythm Clip adds diode clipping, and the effects loop sits on the lead channel. A power switch selects 50 or 25 watts, and the same circuit is used in the 2553 and 2558.

• Years produced: 1987
• Made in: UK
• Wattage: 50W
• Channels: 2
• Preamp tubes: 3× ECC83
• Power tubes: 2× EL34

Known for: Alex Lifeson.

Heard on: Headlong Flight — Rush (2012).

Tags: british, crunch, high-gain, el34, mid-wattage, 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.