So I got the Premium tube set from the Tubestore, matched and balance, and right out of the box, they sound great. I got the preamp used, it's a 2011, and the 6550c tube sure appears (?) it could possibly be the original. There is no markings on the tube. Supposedly the 6H30's were changed. At least now I know i'm starting fresh.
Thanks to all for your input
Cheers