Hi @couger4u, the Lineal experiences that I posted as mentioned by @immatthewj are in this long thread started by another member. A big part of the discussion was about where to purchase them, and whether the ones sold by non authorized dealers at a cheaper price are actually legitimate, and same as the ones sold by their one and only authorized dealer for the US market.
I ended up buying one pair from their "authorized" Linai dealer, and paid the extra money for my own peace of mind. I used them for the balanced output, i.e. slot 3 and 6 on the SLP-05, and I do like them better than the stock EH tubes from Cary.
As for slots 1,2,4,5, I bought some NOS RCA black plate tubes from a dealer named Brent Jesse whose highly regarded in this forum. I also like the RCA's better than the stock tubes.
Anyway, hope this helps, and good luck with finding the tubes that you like. It's a time consuming process.