What tubes does the Marshall JMP1 50th Anniversary use?

The Marshall JMP1 50th Anniversary uses 2× ECC83 preamp tubes and 2× ECC81 power tubes.

When was the Marshall JMP1 50th Anniversary produced?

The Marshall JMP1 50th Anniversary was produced 2012.

Marshall JMP1 50th Anniversary preset

Verified · 88/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

Part of Marshall's 2012 50th Anniversary set of 1-watt heads, voiced after the JMP-era Marshalls. Four ECC83 triode stages carry the signal through Volume, a Treble control and a switchable Gain Boost stage, then a Bass control into the output. Two ECC81s, their four triodes wired in parallel as a single-ended output stage, drive 8 or 16 ohms. It is a small head, not the JMP-1 rack preamp.

Years produced: 2012
Wattage: 1W
Channels: 1
Preamp tubes: 2× ECC83
Power tubes: 2× ECC81

Tags: british, modern, crunch, plexi, low-wattage, practice.

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.