@abd1 looks like RCA 45, and RCA 6sn7. I have not heard RCA 45, yet, but my experience with RCA 6sn7 is that they are very dull sounding and not as musical as other 6sn7 out there. I really like Brimar cv1988 6sn7 but they are pretty much unobtainium now a day. Other NOS tubes I like is the Tungsol black glass, get the cheaper 6f8g with adapter, they sound the same as their 6sn7 counter parts. I also like the new production tubes like the black treasure.
I have the Brimar, Tungsol and JJ will report back when I get I get the chance to try them. Alan mentioned it will take him 2 weeks to build.