Just ordered my Supratek Chenin Preamp

Hey Ait. Congrats on your preamp choice sir,and it's well worth the wait. As others have suggested: run it in for a few hundred hours before rolling tubes. Most nos 6sn7's from different manufacturers[and there are many] will have a flavour... the RCA grey glass is a good one but do roll out the sovtek rectifier first. An old nos Mullard GZ-34 is far superior[sonically] and will last for many years to come.

Interesting thread. I've been a long time user/hoarder of the 6SN7/VT-231 tube because of my Blue Circle BC21, but I have rarely heard or read anything about the RCA grey glass. It seems to be a popular choice for the Suprateks. Can you folks tell me how this tube compares sonically to other 6SN7s like the Sylvania VT-231 or Ken-Rad black glass VT-231? Thanks!

Gunbei, I have been through a ton of 6SN7's in my Supratek. The RCA certainly is not in my top three. And all of my NOS 6SN7's are sitting on the shelf now. I am currently using EH 6SN7's and they are as good or better across the board than any NOS 6SN7 I have tried.

No more $$$ NOS 6SN7's for me. Try a pair of EH 6SN7's and see what you think. I know of several Supratek owners that now have all of their NOS 6SN7's in boxes.

EH as in Electro Harmonix? I didn't even know they made a 6SN7. Thanks for the heads up, Fiddler.

Ait,
I have the same exact preamp in the same color. It is a joy to listen to and a joy to look at. You will be very happy! Bob