Marshall amplifiers appeared on the scene in the early 1960s. Jim Marshall, a drummer in England, opened up a drum shop in London. Regular visitors such as Pete Townsend and Ritchie Blackmore encouraged him to sell guitars and amplifiers as well. Marshall began selling Fender amps. Marshall, who had a background in electrical engineering, began building his own amplifiers. The first Marshall amps were direct copies of Fender's Bassman amp. Marshall amps soon became the most sought after amps by rock guitarists in the 1960s who wanted a heavier sound. Finding replacement parts for a Marshall amplifier is relatively easy.
Call the dealer you bought the amplifier from. If your amplifier is still under warranty, the best strategy is the have the amp serviced by the dealer. The dealer will replace any needed part free of charge.
Contact the Marshall amplifier company. If you have specific questions or need information about the specific parts on the model of Marshall amp contact Marshall directly. The website is Marshall.com. Marshall amps are still manufactured in England. The telephone number is 44 1908 375 -411. Marshall will sell and ship spare parts, but it does not sell electronic parts. Marshall recommends having electronic parts replaced by a qualified engineer.
Purchase parts online. Visit Guitar Nucleus or Guitar Center online (see references.) Both websites sell most parts you may need for your Marshall amplifier. Another strategy is to visit the nearest Guitar Center. They may have the part you need in stock.
Place an add in the local classifieds or music trade paper. If you live in a heavily populated area with a thriving music scene, placing an add in the paper is a good way to go. You may be able to find the parts you need at a good price.
Visit the Reader's Amps section at Marshall's web site. This site provides helpful photos and comments about different Marshall amps. If you are refurbishing an older model, this may help you with the details and let you know exactly what parts you need.