I've just bought myself a 1970's Marshall 4x12. I'm no expert whatsoever on either vintage gear or 4x12's and would appreciate some advice. I've never even owned a 4x12 before. I always felt that 2x12 was enough previously. The thing is that the cab audibly creaks if I lean on the top front edge of the cab, or push in either of the sides of the cab. Is this normal for a fairly old Marshall 4x12 ? Something to worry about ? If the cab is knackered it won't be a disaster, as its come loaded with some very nice speakers. Come on guys, be brutally honest with me.