6SN7GT VT231 TUBES

I know this is not really what you're asking but I have a VTA SP-14 and just replaced the 4 6sn7's with 7n7's (you'll need a base adapter, readily available on ebay). A much more open and detailed sound with no etching of the treble. The bass seems a tiny bit looser but still powerful and tuneful. Very impressed!

I also tired four different kind of 7n7 out of curiosity 2 years ago.

Although they sound clear and detailed but lack overall musicality compared with vt231 or 6f8g tunes.

Thus no more interest in 7n7.

Thomas

But 7n7 tubes are reasonably priced.

Thus you may try them for fun or different flavor.

You never know until you try them in your system.

Thomas

One of the best things about the 6sn7 tubes other than they sound great is there are still a ton available and many at reasonable prices. I use them in a Modwright LS 100 preamp. I didn't go all in on the Tung Sol round plates that go for such high prices but I have a nice selection of Sylvania, Raytheon, Tung Sol, and RCA that should take care of me for many years. I much prefer those to any newly made tubes I have from Russia or China. The somewhat standard Sylvania 6sn7 gtb sound very good in my system and they are plentiful. 

I love the Tung-sol 6NS7 I use them in my Triangle Arts I've owned the older version & his newer line. Pre Amp & Mono-Blocks. They're inexpensive balanced & sound great. When I compare the difference in prices I'll go with Tung-Sol's. More money for vinyl.....