Any other tubes out there?

6bq5 is correct, to my knowledge, about the Ei's. They used to come stock with Jadis preamps before the war came. I have a set that came with my JP80 and a spare reserve set, but they're in storage since I started using Telefunkens, which are just plain a world better and much more long-lasting. Tonally, the Ei's were similar in some respects to the Telefunkens, maybe a shade warmer, but not nearly as dynamic or resolving. I have also used Teslas (12AU7s) in my Audio Logic DAC; they have a warmer, less bright sound than the stock Mullards (probably Brimars?) that AL likes to use. Again, I replaced them with Telefunkens, and the Teslas are back in the drawer for good. Teslas sounded OK, but dark compared to the more balanced (in my system) Telefunkens. The Teslas didn't last particularly long, either, compared to the Teles, which I believe is a common complaint about most all of the tubes made after the 60s.

Thanks everyone for there advise. I plan on doing some tube rolling in the near future for my LS7 and SF dac. Good listening.

All the tubes, you mentioned, are good sounding tubes. However they are not as good sounding, as the tubes, you keep seeing for sale, nor do they last as long. The real sleeper of NOS tubes, are the Valvo's. They do not command the exoirbitant prices of most premium NOS, but have wonderful sonics. From the 6dj8, to the CCa, the family sound, is the same. The gold pin versions, sound more refined, or cohesive, and they are quieter.