It has been a very rewarding experience and great source of achievement for me not to mention it sounds unbelievable.
I inherited from my father a couple of tube testers and found a small book inside one of them titled "1966 tube caddy" Tube Substitution Guidebook.
I'm trying to educate my self on tube rolling and found it interesting that this book lists direct substitutions only and ranks them by E=Excellent or G-Good and has sections listed for Receiving, Commercial & Industrial, American-Foreign tubes.
I have seen the recent posts and understand this is a subjective topic and should let my ears guide me as to what sounds good however after looking at many reputable dealers, private parties and on e bay I could invest a substantial amount of money without hitting audio bliss so would this be a good starting guide?
I have the kit supplied 5814 installed and while the amp sounds great it does sound a little bright to me, the sub book lists them as excellent so do I need to be patient until I have 100 hours or more to see if they smooth out?
If anyone is interested in the info from the book I would be happy to photo and post sections for them as time allows.