Another thing about that cover that I think of now is all that gear is what made "The Who" the loudest rock band in the world back in the 70's, they were pioneering the modern stage and equipment needed to make a rock concert a visceral experience. As a result of playing all those shows, when Pete Townshend started suffering from acute tinnitus it was not surprise, now he's almost completely deaf in one ear and can barely hear in the other when he plays it's from memory now more than what feedback he's listening to.
Picked up a new vinyl pressing of their classic "Who's Next" a month ago, sounds brilliant.