cryogenically treated tubes

[FORMULA73]

I have some JJ EL34s in my M-1000 and they seem ok. They've been in there since I had the thing modded by FJA 6 or 7 years ago, and most of that's been burning through a Weber Mass 100 attenuator. They're still going strong. All my 12ax7s are old RCA blackplates except V1, which is a Matsushita (supposedly a Mullard clone). I never could get into old power tubes-not enough $ for something that's effectively consumable and nearly irreplaceable.

I don't know about the cryo thing. It does sould a little oily and snakey...