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Marshall JMP-1 Tube MIDI Guitar Preamp

Marshall JMP-1 Tube MIDI Guitar Preamp main image

Photo of Marshall JMP-1 Tube MIDI Guitar Preamp and more gear in a amplifier

Photo of Marshall JMP-1 Tube MIDI Guitar Preamp and more gear

Marshall JMP-1 Tube MIDI Guitar Preamp

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$598.85

4.5 (34)

1 Critic Review

5 Reviews

This product is Vintage or Discontinued

Find out who is using Marshall JMP-1 Tube MIDI

3 community setups

32 wishlisted

98 saved

Page last updated Jul 07, 2026

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5.0 (28)

$598.85 21 available Used

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Description

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Experience the power of the Marshall JMP-1 Tube MIDI Guitar Preamp, a rack-mounted marvel built to deliver the iconic Marshall tone. This robust preamp models four distinct Marshall tones, providing you with a wide spectrum of sounds to play with. Whether you're laying down tracks in the studio or rocking out on stage, the JMP-1's emulation of stereo sound ensures your performance cuts through with clarity and intensity. Compact yet mighty, this preamp embodies the spirit of Marshall, offering a blend of tradition and technology that will inspire any guitarist.

Key Features:

Rack-mounted design for easy integration into your setup
Models four different Marshall tones for versatile sound shaping
Emulates stereo sound for a richer sonic experience
MIDI compatible for enhanced control and connectivity
Tube-driven circuitry for authentic, warm tone

Product specs

Brand	Marshall
Model	JMP-1 Valve MIDI Preamp
Finish	Gold
Year	1992 - 2007
Made In	United Kingdom
Categories	Guitar Preamps
Electronics	Tube
Number of Channels	1 Channel
Number of Inputs	1 Input
Pedal Format	Rackmount
Reverb	None

FAQs

What type of sound can I expect from the Marshall JMP-1 Tube MIDI Guitar Preamp?: The Marshall JMP-1 offers a range of classic Marshall tones, emulating four distinct sounds from clean to overdriven. It provides a versatile stereo output ideal for both studio and live environments.
Is the Marshall JMP-1 compatible with MIDI devices?: Yes, the Marshall JMP-1 is a MIDI-compatible preamp, allowing you to integrate it seamlessly with other MIDI devices for enhanced control and versatility in your rig.
How does the Marshall JMP-1 perform in a live setting?: The Marshall JMP-1 is designed for both studio and live use, offering reliable performance with its rackmount format and easy integration into existing setups. Its tube-driven sound is well-suited for live performances requiring dynamic tonal options.
Does the Marshall JMP-1 have built-in reverb?: No, the Marshall JMP-1 does not include built-in reverb. It focuses on delivering pure Marshall tones, so external effects would need to be used for reverb.
What is the power requirement for the Marshall JMP-1?: The Marshall JMP-1 requires a standard IEC power cable and operates on typical AC power, making it straightforward to power in most studio and live environments.

Videos

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Michael Nielsen - Big Hairy Guitars

Marshall JMP-1 Preamp

Michael Nielsen - Big Hairy Guitars

Marshall JMP-1 - In Depth Demo by Leon Todd

Leon Todd

Marshall Amp Demo (JMP-1 / EL-34 50/50) - Part 2 - Overdrive

Vladimir Shevyakov

ADA MP-1 vs MARSHALL JMP-1 GUITAR MIDI TUBE PREAMP SHOOTOUT / COMPARISON

Rick Hollis

Marshall JMP-1 Tones

Leon Todd

Marshall Amp Demo (JMP-1 / EL-34 50/50) - Part 1 - Clean

Vladimir Shevyakov

One Song, One Amp: Marshall Jmp-1 Pre-amp (clean, crunch, rock, leads & metal)

Sonic Drive Studio

JMP 1 Pre Amplifier with Marshall 9200 Stereo Power amp for sale

Wayne Guitars

Reviews

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PROS

Capable of a variety of tones, excels in Marshall signature sounds
Flexible, can replace multiple boutique pedals
Durable, remains functional after years of use
Offers stereo setup capabilities for enhanced sound
MIDI compatibility for modern rig integration
Versatile for practice, jamming, and recording
Compact size, consolidates Marshall tones in 1U rack space
Includes a four-button foot switch for control

CONS

Biased towards Marshall's tone palette, limiting versatility
Clean tones not as authentic as Fender or Ampeg
Higher gain tones lack the range of some Marshall heads
Some find it expensive for its features

Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Marshall JMP-1 Tube MIDI Guitar Preamp.

Features and functionality

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The JMP-1 features a unique tone stack with a mid or bass shift, and functions as a solid state/tube hybrid with an 8-bit microprocessor.
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The JMP-1 requires a 130-volt power supply for the 12AX7 tubes, necessitating ample space for ventilation.
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The 90s Celestion G12T75 speakers are noted for their closer tonal match to the MCIS sound compared to post-2002 models.
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Comparisons

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Users suggest that modern digital preamps like the Axe-Fx can replicate JMP-1 sounds effectively, offering more versatility.
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The Metal Muff Mini is considered an underrated choice for achieving a hack-y MCIS tone similar to the JMP-1.
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The Empress Heavy Menace can mimic diverse distortion tones on clean rigs, offering versatility similar to the JMP-1.
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Sansamp GT2 in 'California' mode closely captures the Zero-type distortion associated with the Marshall JMP-1.
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The ADA MP-1 is noted for a "hairier" sound, ideal for late 80's/early 90's metal tones, while the JMP-1 offers a classic, mid-rich Marshall sound.
Source

User experience

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Some owners find the JMP-1's programmability and MIDI capabilities to be advantageous despite the complexity involved in setup.
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Owners of both units suggest that the ADA MP-1 covers a wider range of amp sounds, making it versatile for varied setlists, unlike the distinctly Marshall-sounding JMP-1.
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Use cases and applications

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The JMP-1 is preferred by some musicians for its ability to assign effects loops to specific channels, making it versatile for studio recording.
Source
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The Filter 'Short Bus' and Ministry 'Mind' distortion pedals are modeled after the Marshall JMP-1 tone, specifically for high-gain, industrial sounds.
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The JMP-1 is recommended for achieving a warm, mid-focused tone, suitable for players who prefer a consistent Marshall sound across different performances.
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Value and pricing

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Used JMP-1 units are priced high due to limited supply and demand, with prices ranging from $600 to $1000 on Reverb.
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Other

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The distinct interface of the original JMP-1 is praised for its usability, though it would be challenging to replicate in a pedal format without losing functionality.
Source

Critic Reviews

Marshall JMP-1 Review

guitarmasterclass.net

The Marshall JMP-1 Tube MIDI Guitar Preamp is a robust, reliable unit that has stood the test of time since 1995. Its user-friendly interface makes creating presets a breeze, although MIDI setup can be a bit complex for beginners. The preamp shines with its powerful, high-gain distortion, delivering the classic Marshall sound that many guitarists seek. However, its clean tones may lack the warmth found in traditional tube heads, which could be a downside for purists. Despite this, its versatility with different power amps and solid mixer outputs make it a valuable addition to any rack setup. Overall, it's a must-have for Marshall enthusiasts looking to build a rack system.

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Full Review

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4.5 out of 5

Based on 5 Reviews and 34 Ratings

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1 star

jimmarchi1

41029

over 8 years ago

the only preamp I can remember owning

put an alesis 3630, 3631 or any studio VCA unit with soft knee in the loop, set for mild grab and a huge make up gain boost and you will have the preamp sound of every dirty MCIS rhythm tone short of 'to forgive'. Do more grab and less makeup gain on a clean channel and you have the clean tones sans effects. You don't even need the mesa power amp, DI it and then throw an impulse of a stock 1960B cab powered by a tube power amp on it and that's that. Not a easy to cop the ZZ top live sounds though. This was supposed to approximate every Marshall tone you could think of but it se approximation of anything but the higher gain heads like the jubilee and the 900s. Not one of my favorite pieces of kit when I had it but I miss it now that its gone because it has its own sound. These have become quite expensive as of late.

Roles:

Guitarist Bassist Keyboardist

Genres:

Electronic Orchestra Alternative rock

johnpickk_

875

over 7 years ago

awesome preamp

this thing is so versitile! Would recommend, as long as you are either running a pedal (i run the marshall jackhammer through it and LITERALLY transforms the sound into something 1000x better, i was so suprised for a cheap pedal!) or running through a tube power amp. Very cool preamp though

armin_rauls

189

over 5 years ago

Killer

Killer unit with killer sounds from clean to mega heavy

gravien

over 9 years ago

Legendary marshall tone in 1U rack

this would be the only choice for marshall tone maniac guitarists that don't have too much space for guitar amplifier. You will get every single marshall tone in 1U rack space, or probably closer tone...

jszabolcs2006

280

over 10 years ago

My main preamp, my main voice

I use this preamp at live shows and in the studio. A very versatile preamp with all the legendary Marshall tones

jimmarchi1

41029

10 years ago over 10 years ago

I have been tempted to buy one of these for when I want channel switching ever since the 90s and always chicken out because of all the ICs involved in the circuit, its just so untubey, but people who hav them love them, so...... either those people are crazy or I should break down and get one?