On Mon, 09 May 2005 13:53:27 -0400, Jon Yaeger
wrote:

Almost any Sovtek 9 pin miniature tube that I've tested and that has been in
service for a few years is bad (e.g. 6922, 12AX7).

Jim McShane says that current Sovtek production doesn't have this problem.
I'm not entirely convinced. Makes me want to stick with NOS stuff just to be
safe . . .

Anyone have a similar or contrary experience?

I've no comment on current production, but mid-1990's "USSR" EL84's
will blacken internally immediately and then run forever. And that
era's 6SN7 and 6SL7 equivalents are perfectly fine. I prefer them to
Tungsol's, RCA's and almost anything except maybe early Sylvania's.
Just a very personal opinion, of course, and of no real value.

6922's are variable; buy some from Jim or Ned; get the best they
offer; life's short; don't dick around.

Chris Hornbeck