Founded: 1962
Founder: Jim Marshall
Location: London, England
Marshall Amplification began in a small drum shop in Hanwell, London. Jim Marshall, a drum teacher and businessman, started the company to meet the demand from guitarists (including Pete Townshend and Ritchie Blackmore) who were looking for a louder and more aggressive amplifier than what was available at the time—primarily Fender amps from the U.S., which were expensive and hard to find in the UK.
Jim worked with electronics expert Ken Bran and technician Dudley Craven to create the first Marshall amp—the JTM45, released in 1962. It was heavily inspired by the Fender Bassman but used different components available in Britain, resulting in a distinct, rawer tone that appealed to the emerging rock and blues scene.
By the late '60s, Marshall amps had become a staple of British rock. Iconic players like Eric Clapton, Jimi Hendrix, Jimmy Page, and Pete Townshend adopted Marshalls for their power and crunchy tone.
Marshall responded to the demand for more volume by creating the Marshall “stack”—a 100-watt head (Super Lead, or “Plexi”) paired with two 4x12 cabinets. This configuration became the visual and sonic symbol of rock and metal.
The 1980s saw further innovation, with the release of the JCM800 series—famous for its aggressive gain and reliability. These amps became standard in punk, hard rock, and metal genres. Guitarists like Slash, Zakk Wylde, and Kerry King swore by them.
In the 1990s, Marshall continued evolving with models like the JCM900 and later the JCM2000, offering more flexibility and modern tones.
Marshall has since diversified its product range to include:
Marshall has also ventured into lifestyle products like headphones, Bluetooth speakers, and fridges shaped like amp heads—appealing to its loyal fan base.
Legacy
Today, Marshall remains a cornerstone of guitar amplification, known for its “British sound”—warm mids, crunchy overdrive, and thundering power. Its amps have played a pivotal role in the development of rock music and remain a symbol of loud, rebellious energy.
1962–1969: The Birth of a Legend
1970s: The Rise of the Stack
1980s: Innovation and Expansion
1990s: Technological Advancements
2000s: Diversification and Modernisation
2010s–2020s: Embracing Digital Innovation
• • 2023: Marshall Group was officially formed, combining Marshall Amplification and Zound Industries to pioneer the future of sound and technology.
Dating your Marshall amp head or combo from mid 1969 onwards is a pretty straight forward process as Marshall started using an alphabet system that related to the year of manufacture. The serial numbers were stamped into the aluminium panel on the rear of the amp and between 1979 -1981 they were also on the front panel. If the inspection sticker is still on the top of the chassis then you should be able to get the exact date it went through its final tests before being shipped out to a dealer.
The stamps are 3 separate pieces of information, the model code, the serial number and the year letter. The models codes are generally what's listed below but you do find slight variations occasionally or sometimes one isn't included and the JCN 900's didn't have one at all.
SL/A - 100w Super Lead
SL/B - 100w Super Bass
S/A - 50w Lead
ST/A - 100w Tremelo
T/A - 50w Tremelo
SP/ - Super PA
A/ - 200w
RI - Reissue
The date codes for Marshall amplifiers between 1969 and the end of 1983 were placed at the very end of the whole serial number, then from 1984 until October 1992 the date code was placed between the model code and the digits of the serial number. Below is a full list of the date codes, you will notice there is no 'B", as the 'A' ran for about 18 months from July 1969 through 1970, they jumped to 'C' for the start of 1971. The letters 'I', 'O' and 'Q' were also not used but due to their similarity to numbers.
A - July 1969 - Dec 1970
C - 1971
D - 1972
E - 1973
F - 1974
G - 1975
H - 1976
J - 1977
K - 1978
L - 1979
M - 1980
N - 1981
P - 1982
R - 1983
From 1984 until 1992 the year letter appears before the numeric digits but still continues the previous alphabetical pattern.
S - 1984
T - 1985
U - 1986
V - 1987
W - 1988
X - 1989
Y - 1990
Z - 1991 - 92
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