Marshall

JMP-1

Valve Midi Preamp - 120v

Year: 1993

Serial Number: 931027504

This JMP-1 rack unit pre amp is in very good condition and has just benefited from a full check over, service & PAT test.

Voltage is set to 120v USA.

The Marshall JMP-1 is a legendary 1U rackmount MIDI tube preamp that brings authentic Marshall tone into the world of programmable rigs. Combining two ECC83/12AX7 valves with digital control, it offers the warmth, dynamics, and punch of classic Marshall amplifiers with the flexibility of 100 fully programmable patches.

The JMP-1 features four fully independent channels—Clean 1, Clean 2, OD1, and OD2—covering everything from sparkling cleans to searing high-gain leads. Each patch can store gain, EQ, volume, and presence settings, allowing instant recall via front panel controls or MIDI. Stereo outputs, speaker-emulated outs, and an effects loop make it equally at home in the studio or on stage.

Key Features:

• All-valve front end with 2x ECC83/12AX7 preamp tubes
• 4 programmable channels: Clean 1, Clean 2, OD1, OD2
• 100 user-programmable patches with MIDI in/out/thru
• Stereo and speaker-emulated outputs for direct recording or live use
• Programmable effects loop and MIDI mapping for seamless integration
• 1U rackmount design for professional rigs

Favoured by players from rock and metal to pop and fusion, the Marshall JMP-1 delivers the unmistakable Marshall roar in a compact, versatile format—perfect for modern guitarists who need both tone and control.

Worldwide Shipping Available

***This head has just been serviced by Dave Wittering at Prestige Amp Servicing, who is an ex-Marshall senior service engineer and is in full and perfect working order.***

All of our heads are shipped in custom made Overdrive boxes with extra protection inside. We usually use UPS for international shipments. We have lots of experience shipping Marshall items worldwide and ship to North America and Europe on a weekly basis.

We are proud to be an Authorised Marshall Retailer, with shipping available across the UK and all of Europe for new gear and worldwide shipping for our used items. We also have a dedicated showroom where you can experience and test the amps in person.