Fender Bassman 135 (1979-1983) is a powerful bass amplifier that offers a wide range of features to help you get the sound you want. With 135 watts of power, this amp can easily handle any gig. It has two channels, a normal channel and a bass instrument channel, each with its own set of controls. The normal channel has a bright switch that adds brilliance to all notes, especially higher frequency notes. The bass instrument channel has a deep switch that provides deeper tone (more fundamental, less harmonics).