Vibro Champ Amplifier by Fender
Available between 1964 and 1982. Black tolex body, 4 watts (later up to 5 watts in 1969-71 and 6 watts starting in 1972), 1x8" speaker; blackface from 1964 to 1968, silverface 1969 to 1981, then blackface again in 1982.
