The pickups are microphonic though. Crank it and it squeals out of control. They need to be replaced.
Good old PAFs weren't potted either. Maybe try that before replacing them. But first, I'd try lowering them, move away from the amp and try not to scoop the pickup with your hand.
I’ve heard another trick with unpotted and microphonic pickups is to remove the covers. It is said Page and Young have both done this at one point or the other.