Tweed

A linen material used initially by Fender to cover its cases and amplifier cabinets beginning in the 1950s, as well as various reissues. The term is now generally used to define an amp from that period (for instance, a 1959 Tweed Bassman). To a lesser degree, the term is also used by a number of manufacturers of modeled guitar amplifiers to describe emulations of the overall tone associated with late 1950s-era amps. Other amp builders have released retro-look models that are covered in tweed.