I think that is what's called the Jeff Beck technique…Back in 1971 my 1966 Fender Bassman amp started making some weird low frequency sounds in between songs. Some judiciously applied "percussive maintenance" to the top of the amp would temporarily clear it up.
Come to find out it was a tube that had gone microphonic and upon replacement said problem disappeared. Of course, that was an all-tube amp and I haven't used percussive maintenance on any of my amps since. I certainly would not recommend it to be used on Solid State amps. However, I have found the threat of percussive maintenance to be persuasive upon occasion...![]()
Yes, that segment is daft. The director wanted it to play out that way. The Who were approached initially, but Townshend and Antonioni got into an argument over how it was to go down, they bailed, and the Yardbirds were next in the phone book.
