On a tape recorder, the motor that is used to supply hold-back tension to the tape on the supply reel and to rewind the tape.
"Dear CVC Productions: I waited for years for an obscure Japanese musician's work to be released on a CD. No luck. So I sent my three old, long-play records to CVC for conversion. I now am the proud owner a single CD with the cream cuts off those three albums! Very satisfying. Good work guys! Thank you! "