Pro Junior Microphonic Tube Problems

[Reverieband]

Any pro junior owners having trouble with pre amp tubes going microphonic? If its just me whats causing it? Who makes the best tube rings?

 

[drbob1]

Don't buy the rings, just get a decent first preamp tube: spend a little extra and get KCA NOS to send you a nice RCA or Sylvania! Or even Phillips ECG.