I don't know why this isn't getting responses but you could do a search for reputable tube dealers and then discuss what kind of sound you're looking for with one of them. They have the experience to help determine which tube might work best for you.
I did not have good luck with a couple of early Mullard reissues, poor reliability, but was told they later improved the quality control. Recently got a set of the PSVANE tubes, and like them quite a bit, for modern tubes. Used in a phono pre, they have a very slight hiss, but very nice midrange and bass, no lack in the highs that I have been able to id.
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