Marshall

JMP 2204 – 50-Watt Master Volume – 1979 – Fully Serviced

Serial No: S/A 07956L

A true classic from Marshall’s golden era — this 1979 JMP 2204 is the sound of countless legendary rock records. Tight, aggressive, and unmistakably British, the 2204 remains one of the most sought-after Marshall circuits ever produced.

Overview

The 50-watt Master Model Lead is renowned for its simplicity and punch — delivering that perfect balance of clarity, crunch, and control. Thanks to its cascaded gain stage, the 2204 covers everything from edge-of-breakup cleans to rich, harmonically saturated drive.

Compared to its 100-watt sibling (2203), the 2204 reaches its sweet spot earlier, making it incredibly usable for both studio and live work. Plug into a good cab and you’re instantly in classic hard rock territory.

This example remains unmodded, retaining its original circuit character, and is in excellent working order — delivering tight low end, cutting mids, and that signature upper-mid bite.

Features

• 50-watt all-valve head
• Vertical input JMP era
• EL34 power section with ECC83 / 12AX7 preamp valves
• Original Drake mains transformer (1202-164)
• Original Drake output transformer (784-139)
• Dagnall replacement choke
• Cascaded gain stage for classic Marshall crunch
• Full control set: Presence, Bass, Middle, Treble, Master Volume, Preamp Gain
• UK-built during one of Marshall’s most revered periods

Service & Condition

Recently serviced by Dave Wittering at Prestige Amp Servicing (ex-Marshall senior service engineer).

The amp has undergone a full professional service and health check, ensuring it’s reliable, stable, and ready to go — without the common issues found in long-unserviced vintage amps.

Service work includes:

• Full potentiometer replacement
• OEM Marshall EL34B Output Valves x 2
• OEM Marshall ECC83's Pre-amp Valves x 3
• Input & Output sockets replaced
• V2 Anode Load - 100k 1/2w
• Bias smoothing capacitors x 2
• V1 Grid oscillation update
• Voltage selector has been stripped, cleaned & re-tentioned
• New set of OEM Marshall knobs
• NOS Marshall OEM fuse holders
• Dedicated chassis earth
• Bias set correctly
• Fully PAT tested
• Complete health check

Cosmetic Condition

• Original head shell, tolex, feet, and hardware
• Light/medium, honest age-related wear
• Overall clean with small snags & tears to tolex.

A superb example of a late ‘70s JMP 2204 — fully serviced, unmodded, and delivering exactly the tone that made these amps legendary.

Worldwide Shipping Available

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.