Very clean… Everything works as it should.

Marshall JMP-1 Valve MIDI Guitar Preamp Rackmount Tube Preamp w/ Speaker Out

Marshall JMP-1 Valve MIDI Guitar Preamp - Rackmount Tube Classic

Offered here is a Marshall JMP-1, one of the most iconic rackmount guitar preamps ever produced.

Combining genuine Marshall tube tone with full MIDI programmability, the JMP-1 became a staple in professional touring and recording rigs throughout the 1990s and remains highly sought after by guitarists today.

Powered by a pair of ECC83/12AX7 tubes, the JMP-1 delivers four distinct channels covering everything from pristine cleans to classic British crunch and high-gain lead tones:

Clean 1 - Warm, full-bodied clean tones with excellent headroom.

Clean 2 - Bright, articulate cleans inspired by the legendary JTM45.

OD1 - Classic Marshall crunch with rich harmonics and smooth saturation.

OD2 - High-gain lead channel with tight low end, sustain, and modern aggression.

Designed for maximum flexibility, the JMP-1 features full MIDI In, Out, and Thru connectivity, allowing instant preset recall and seamless integration into complex rack systems. A programmable stereo effects loop, stereo line outputs, and speaker-emulated outputs make it equally at home on stage, in the studio, or as the heart of a modern recording setup.

Features

Marshall JMP-1 Valve MIDI Guitar Preamp

Genuine Tube (ECC83/12AX7) Preamp Design

Four Fully Programmable Channels

Classic Marshall Clean & Overdrive Tones

Full MIDI In / Out / Thru

Programmable Stereo Effects Loop

Stereo Line Outputs

Speaker-Emulated Outputs

1U Rackmount Chassis

Condition

This unit is previously owned and shows cosmetic wear consistent with normal use. It has been tested and is fully operational, functioning exactly as intended.

Please review all photos for the exact cosmetic condition.

A legendary Marshall rack preamp that continues to be a favorite among guitarists seeking authentic valve tone, MIDI convenience, and professional rackmount versatility.