Anyone tried the EAT 6922s in their preamp? Or replaced 6550s with the new KT 120s

Beeswax , Thanks for the response. I may try to pick some up at Axoona. Last year they had some pretty good discounts on them. 
Did your friend use the 6922 in a preamp or phono stage?

When I had my Octave I had TS 6550 solid grey and black plates (no holes). I also had SED 6550 and KT88's GL KT88 Russian reissue. Ei KT90's - Eat KT88 diamonds original GEC KT88 and TS KT120's. I would rank them from warmest sounding to most linear this way. TS 6550 black plates (warmest) then grey plates - SED KT88 - GL KT88 - Ei KT90 - Sed 6550 - Eat KT88. The KT120 was kind of an oddball IMO which I did not care for. Punchy lows - glaring mids and highs that sizzled instead of sparkle.

That said a lot depended on which speakers I had. The Dyn C1's sounded great with the warmer tubes and the Raidho D1 and D2's sounded much better with the more linear sounding tubes.

I had little time with the Eat KT88's because I lost 4 of 7 tubes (all purchased used) in less than 2 months. I'm sure I would have liked them the best with Raidho's.