Twin Reverb is an tube amplifier combo from the Fender Twin family. Starting from 1963 the series, renowned for it's clean tone, was produced, along with various reissues, up until today.
The Twin Reverb is a 2x12 inch speaker combo, originally having 85 watts. It was originally created with the 'blackace' look, having black tolex on the cabinet and gray/silver facecloth with a black fender logo. This is propably the most recognized Fender amp look along with the original tweed amp looks.
The the reverb in the name comes from the reverb device inside the amp, which was an old-school style spring reverb.
The Twin Reverb consists of two separate channels, Normal and Vibrato.