We waited with baited breath for the stylus to hit the vinyl to be finally rewarded by ...,
A very flat, bland and totally uninvolving sound.
Upon reaching for my well played early English pressing (complete with real zipper!) we were rewarded with a ballsy dynamic sound just bursting with life and energy. The difference was not subtle.
The moral: not all vintage rock vinyl sucks.
And if you can, try before you buy.
Or maybe it was just the zipper?