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Tube Discussion Microphonics?

I have read in quite a few places where someone complained of this tube or that being microphonic. I understand what is meant in a discussion of matching output parameters but I have heard people say that a pair, or quad, of tubes were matched but still microphonic.

What does it mean for a tube to microphonic? How does this translate into audible identification? I mean how do you tell by listening whether a tube is microphonic or is just not a good sounding tube or not good sounding with a particular component?
motdathird

Showing 2 responses by sugarbrie

sugarbrie
3,854 posts
 
A little microphonics can be a good thing. Older vintage tubes are more likely to be a little microphonic. But these are also the ones audiophiles will pay a premium for. Is there a connection?

A little microphonics can add some "air" to the sound, or slightly emphasize the highs, which might be a good thing in your system? Trial and error as usual.

A tube with absolutely zero microphonics will very likely sound kind of dull in many systems. This is true of many new modern tubes.
sugarbrie
3,854 posts
 
If the tube is only slightly microphonic when you tap on it, then what is the problem? I agree 100% that a tube that is microphonic in normal use is a piece of junk.

Folks including Kevin Deal at Upscale Audio, who sells some of the best NOS tubes, has said similar things.

http://www.duncanamps.com/technical/microphonic.html

If all distortion is bad, then why do they add white noise on purpose in CD playback?
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