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In Reply to: RE: Are power triodes microphonic typically? posted by greg7 on June 26, 2012 at 10:00:25
I've had 2A3s, 300Bs, 10/10Y/801As, 845s and probably a few I'm forgetting. For the most part they were not overly microphonic. Maybe a couple of the real early 10s, but as a general rule, they aren't that bad.
Just my experiences...
The simple tap with eraser test always seems to elicit some kind of a response. So depending on the natural response to specific testing procedures you can make almost any tube "microphonic. The tubes may have changed little but the obssession with tubes may have spuriously increased the percentage the number of microphonic tubes.
I once was complaining to a very knowledgeable audiophile/builder/friend about how microphonic a particular tubes was. He said how do you know it's microphonic, I replied "I was tapping on it and could hear it", but added "I sure like the way it sounds". He says "then quit tapping on it". Never tapped on a tube since!:-) Having said that, I think tube dampers can be a good thing.
To some degree, that goes without saying. I Haven't found most power triodes in general to be more so.
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