"Sorry to say, all tubes are microphonic, at least to some degree; there simply isn't such a thing as a non-microphonic tube."
True enough. But to find the most microphonic and thus problematic tube, lightly tapping each tube as Rrog suggests will help you isolate the bad boy so you can replace it with a new one. Just make sure you have the volume set at a low level when you do it.
True enough. But to find the most microphonic and thus problematic tube, lightly tapping each tube as Rrog suggests will help you isolate the bad boy so you can replace it with a new one. Just make sure you have the volume set at a low level when you do it.