This amp recently came in for service... an all original Blackface Vibro-Champ... It needed a new output tube and a cap job. Also cleaned the pots, re-tensioned the V1 tube socket and the grounding pin of one of the input jacks. A great sounding amp from 1966, just after CBS purchased Fender, but before they started messing around with the great Fender designs of that era. A simple but beautiful design.