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71.23.24.2
In Reply to: RE: What is the "sound" of microphonic tubes? posted by Nickel Core on October 26, 2014 at 13:20:04
And somehow more info. The ringing is often high pitched and masked by the music somewhat. For classical music, getting rid of microphonic tubes can really make violins easier to listen to. Great for some of us that really have trouble with "bright" systems.
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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.
a light tap with the fingernail should not produce a 60 second ring but, with very microphonic tubes it can. Subs can certainly set them off by shaking the glass and the box of the amp/preamp.
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