I am a believer in NOS tubes, but I don't have experience with those. Call Brent Jessee or Andy Bouwman of Vintage Tube Services and they'll help you get the right tubes.
good thing about 6sn7 and sl7 is there are many many makes and types, old and new, from many different places over the world, all with their own sound - but most sound quite good, some really excellent
When I needed some very quiet 6sl7 tubes for a phono preamp Andy at Vintage Tube Services recommended Sylvania. He set me up with a NOS pair that were excellent. I sold the phono pre shortly after I received the tubes as I acquired a different pre with phono built in but still have those tubes. Also have the RCA 5691 red base tubes. Sylvania a little more air while the RCA had a little more meat on the bones…
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