The footage features stars such as Sir Elton John, Status Quo and Elvis Presley and had previously been thought lost after the BBC got rid of parts of its archive.
The broadcaster used to record over old film to save money.
However the performances were preserved by a Welsh music fan who used a a Sony CV-2000 to record them from his TV.
The device was one of the first video tape recorders for home use. The tapes, along with DVD digital back-ups, are going under the hammer at Omega
Auctions of Newton-le-Willows, Merseyside.
Auctioneers expect the tapes to fetch between £5,000 and £8,000.
Others artists featured include Sir Rod Stewart, Mungo Jerry, 10cc, Roxy Music and Canned Heat.
The recordings are sold without copyright, auctioneers said, and no reproduction is allowed.
The auction will take place on September 8.
