Vintage Marshall JMP50 Head - UK 1973

The Marshall JMP50 is one of the most legendary amplifiers of the rock and roll era, renowned for its raw power, dynamic response, and unmistakable British overdrive. Produced in the early 1970s, this amp became the go-to choice for countless rock guitarists, bridging the gap between the earlier Plexi models and the later JCM800 series.

By 1973, Marshall had refined the JMP (Jim Marshall Products) series, introducing higher gain and a more aggressive voicing while maintaining the amp’s signature warmth and articulation. The JMP50 was offered in both lead (1987 model) and bass (1986 model) circuits, with the lead spec delivering searing midrange, tight low-end, and singing highs—perfect for classic rock, hard rock, and early metal tones.

This 1973 Marshall JMP50 Head is in excellent working condition, fully ready to rock. It delivers classic British crunch with remarkable clarity and punch. At lower volumes, the amp remains warm, articulate, and responsive, but when pushed, it enters a world of harmonically rich overdrive and powerful sustain.

It features two channels (Normal & Bright) with separate volume controls, allowing for a wide range of tones, from smooth cleans to fat, driven blues and high-gain rock tones. The addition of a presence control ensures extra bite and clarity, making this amp exceptionally responsive to picking dynamics and guitar volume adjustments.

For those seeking the classic “Plexi” sound with a bit more aggression, the JMP50 delivers in spades—this is the sound of rock as it was meant to be heard.

Vintage Marshall heads are built to last and sound phenomenal, and this 1973 JMP50 is a fine example of that. Whether you’re after bluesy cleans, classic crunch, or searing rock tones, this amp is ready to deliver legendary Marshall tone with no compromises.

Features:

Model: 1973 Marshall JMP50 Head

Circuit: 1987 Lead Spec

Power Output: 50 watts RMS

Preamp Tubes: 3 x ECC83 (12AX7)

Power Tubes: 2 x EL34

Rectifier: Solid State

Channels: 2 (Normal & Bright)

Controls: Volume (per channel), Treble, Middle, Bass, Presence

Inputs: 4 (High & Low per channel)

Construction: Aluminium front panel with black tolex covering