Tubes for Sonic Frontiers Line 1?

Same response as Sdecker. I have one. Someone asked the same question about a line 1 or 2 a few months back. He did quite a bit of research and had some good posts.

Try Amperex PQ white label early 60s USA made 6922 or 7308 tubes. Also Siemens early 60s CCa.

Here is some reading material,
http://www.audioasylum.com/scripts/d.pl?audio/faq/joes-tubes.html#6DJ8
http://www.hktubeaudio.homestead.com/files/6DJ8.html

Who knows??? I am new to this also, having just purchased and tubed a SF Line 2 to try something different compared to my Muse 3 Signature SS preamp. Sort of a mixed bag. I talked with one "well regarded on the net" tube vendor who basically said it is almost impossible to adequately tube a SF Line preamp, and that he doesn't try anymore, along with some generally negative remarks about the 6922/6Dj8 tube. I was discouraged and called Chris Johnson at Parts Connexion, who designed the SF Line preamps, and who has successfully recommended parts I have purchased before. Chris suggested putting your best tubes in the two back spots, and I ended up with Siemens CCa in those spots and Siemens 6922 nickel pins in the other four spots. With only a short break-in, the MF and HF sound good, but the LF is a bit loose or boomy, compared to my Muse pre, which resulted in very tight well defined bass (my speakers go down into the mid-low 20's. In general, the tube pre provides better texture and three-dimensionality compared to the SS, but the SS pre has better resolution and much better defined bass. I am going to ride this out for awhile until the tubes break-in, then make up my mind whether to stay with the SS or tube preamp.