So I just picked up a one owner 59 Bassman pretty much all original. The tubes have been changed the Caps in the can have been changed also. The only other things changed are the presence and mids pots. Sound great and has no noise, but looking at the speakers which are all the original P10r's the dust cones are all rotted away. Also I know a few of the speakers have some really thin cone's. The material feels like it could almost crumble. My questions are just replace the dust covers and let it go? Recone the complete speakers or just leave it.