Marshall Amplification was founded by drum shop owner and drummer Jim Marshall and is based in Bletchley, Milton Keynes. Marshall amps were originally based on Fender amplifiers, but had their own sound, and were soon sought out by guitarists seeking that sound and more volume. Many of the current (and reissue) models of guitar amplifier continue to use vacuum tubes.
The Marshall amplifiers more aggressive voice quickly found favour with players such as Eric Clapton, Clapton asked Jim Marshall to produce a combo amp with tremolo which would fit in the boot of his car, and one of the most famous Marshall amps was born, the "Bluesbreaker" amp. Other early customers included Pete Townshend and John Entwistle of The Who, at the request of Pete Townshend, Marshall produced an 8x12" cabinet on top of which the 1959 Plexi was placed, giving rise to the Marshall stack, an iconic image for rock and roll.