desingnsfx,
As others have suggested, when in doubt, reach out to Brent Jessee.....he is simply the best resource for information and tubes.
Tube rolling power tubes is a no go for me, as I have 4 output tubes, I currently have Tung Sol KT88s and KT120s.
Rectifiers do make a difference, my Philips 5R4GYS tubes are better than my Mullard GZ37s, which are better yet than the more common Sylvania and RCA rectifiers (some of which can be quite good). The Philips used to be affordable, but believe they're about $250 each now
Signal tubes. Not sure which you use, but I've never been disappointed in any NOS Amperex tubes.....Brent also has the best reference material I've ever seen on old 12AU7, 12AT7, 12AX7, 6SL7, and 6DJ8 style signal tubes.....just click on your style of tube in the yellow box
Best of luck