I 2nd the Gold Lion KT-77 reissue. Very good and reliable!
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I just asked pretty much the same question. I tried some loner Fatboy tubes NOS (6CA7), and I went through all the sets of EL 34 tubes I had on hand. I wound up purchasing some NOS Mullard EL 34's.
Another tube that impressed me was some Winged C EL 34's. Other than the Mullards I bought, these were the next-best sounding tubes.
The JJs are fine sounding tubes and it helps if you have a company like Tubedepot select pairs or quartets. I've had great luck with them. But to my ears the best of the current EL34s are the EH 6CA7s for power, dynamics and bass capability. These came stock in my Snappers and I wouldn't think of swapping them out for another brand/model.