What is the best 6SN7 driver tube?


I was told by some very experienced tube nuts that the best 6SN7 is the earliest version of Sylvania VT-231. Is there any truth in it? I thought the RCA red base 5692 is the ultimate driver tube around. Any thought on this issue will be helpful.
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Last summer I picked up a lightly used Aric Audio Motherlode II.  The gentleman I purchased it from,sent it with a pair of Ken Rad black glass VT231’s. I also don’t have much experience with the 6snl7 tubes. However most that I have tried,( some 50’s,60’s RCA’s,Sylvania’s,GE) don’t seem to match what I’m hearing with the KenRads.  I do at some point plan on trying Psvane,and possibly Linlai globe type tubes.

I too have tried many 6sn7 tubes over the years.  My Rogue Metis Magnum pre-amp takes a pair of these tubes.  Currently I'm using Sylvania 6sn7w short bottle black base.  Out of all the tubes I've tried these are my favorite besides the metal base 6sn7w"s.  I own most of the top rated USA tubes on the VTV shoot out list.  For the ones I own I would say the ratings and descriptions of the tubes are pretty spot on.  I'm lucky that I have a local guy that tests and sell tubes.  I've known him so long that he gave me a pair of metal base Sylv. 6sn7w's to try out.  The black base ones I have now sounded close enough to the metal I didn't buy them.  The best non-expensive tube in my opinion is the GE 6ns7gta.  It does a lot of things right for a relatively low price for an old stock tube. 

The addition of a couple NOS Sylvania GTA 6SN7 tubes really made my Schiit Freya+ perform beautifully. It doesn't seem to matter what tubes are in the buffer stage. I think I have Tungsol or Electro Harmonix. A Chinese brand Shuguang have sounded very good in the Freya. These things are tall and have a "Belted" shape for lack of a better term. My Sylvanias were $100 for a pair. 

Markusthenaimnut,   I ordered some of those Shuguang WE6SN7 plus tubes that you mentioned in your last post from Grant Fidelity last Feb 2023. Unfortunately they got lost and I never received them. Grant Fidelity said that the insurance that I purchased was only for breakage and didn't cover lost tubes. After about eight months they finally offered to give me a $166 credit which was about half of what I paid.  The WE6SN7 plus tubes are no longer available. 

    I've been using Shuguang CV181-Z, Linlai E6SL7, and Shuguang WE KT88 tubes in my RFTLYS A5 and they sound pretty good together and also look very nice.