Cary Audio SLP-5 Preamp Tube Replacement.

@immatthewj I ordered from AliExpress as they have the lowest prices as @perkri said. Viva tubes has them, but the price is about $100 more. The expected delivery is March 8th. Keeping my fingers crossed.

Good luck! I hope they play well for you!

I've been using various 6SN7s (GTBs in my case) and found that NOS GEs sound best for my tastes, and last a really long time. 

@immatthewj I have the LinLai E-6SN7 tubes in all 6 sockets since I used the SLP-05 balanced.  I don't use headphones so I have cheap throw away tubes in the other two sockets.  It has never been clear to me if you could leave those sockets empty or not.

I have only used the E-6SN7 tubes.  I have no experience with any of LinLai's cheaper tubes but I have tried different 300B tubes from them and generally I think you get what you pay for when you move up their product line.  I only buy from Aliexpress and don't think the premium from Viva or the other US vendors is worth anything despite their claims otherwise.  

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.