In Reply to: When I have gotten rid of my very microphonic tubes I hear an ease to the music posted by richardl on October 26, 2014 at 13:53:10:
It really all boils down to how microphonic a tube is when excited by musical vibrations in the air and the surface on which the tube sits.
Tapping the tube tells you that it is sensitive to a very large mechanical vibration, but not necessarily to sound.
I'd be curious to try an experiment - one where you take a speaker on a different amp, run a sweep through it while pointing it at the tube in a circuit, then measuring the output of the amp that tube is in, to see what actual sound gets picked up and amplified. I think that without doing that, what constitutes a microphonic tube is somewhat in doubt.
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Follow Ups
- RE: When I have gotten rid of my very microphonic tubes I hear an ease to the music - Sherwood Forest 14:22:56 10/29/14 (1)
- When they ring on and on, it is pretty bad - richardl 15:08:20 10/29/14 (0)