microphonics?

[shooter]

Can external conditions, bias, gain, impedance etc, cause a tube to "act" microphonic? 
I have a condition where any tube in the previous gain stage works fine, but when they are moved to the next stage, they are all  microphonic.

thanks

[pompeiisneaks]

if the socket itself is doing something bad, I think so.  I.e. sometimes the sockets can start conducting a bit and you'll get really whacky behavior.  (i.e. the problem doesn't follow the tube, it stays with a socket).  This is invalid if the sockets are ceramic, though.  Sluckey taught me all this :P

~Phil