-> michrophonic.  Pittman claims that he buys cases of cheapo Chinese
-> tubes and tests every single one of them, keeping only the "best" and
-> those with the "hardest vaccuume".  He supposedly sells the rest to
-> suppliers like Ruby and Peavey.   Pittman tests the tubes to be good
-> when they're new... the complaints I've heard about Chinese tubes is
-> they simply don't last.
I generally use Chinese 12AX7's in my JTM45's.  It's true that a high
percentage of them go microphonic rather quickly, (within 30 minutes or
so) but if they last the 30 minute test, they work well and sound really
good in those particular amps.  I get pretty good life out of them.
--- FidoPCB v1.4 [fb34e/D]
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