The Fender Twin Reverb Silverface was introduced in 1968 as an update to the classic Fender Twin Reverb Blackface. The Fender Twin series is an all tube amp with two 12” speakers and noted for its clean tone. The Silverface had more power than previous models, with 100 watts, and the models made between 1977-1982 had an ultra linear output transformer. This gave increased power - 135 watts.