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In Reply to: Jim, it's pretty easy with a George Kaye small tube checker posted by Dave Pogue on February 25, 2014 at 06:24:23:
Dave,
That was not stated in the original post, so I had no way of knowing what else occurred. Maybe Grant Fidelity wasn't being as magnanimous as I thought...
I have 3 devices to check for noise/microphonics - the VTV Vacuum Tube Characterizer, the Maxi-Preamp tester, and the Amplitrex AT-1000. Those devices (and some headphones for the Maxi and Amplitrex) can indeed do a good job of detecting excessive microphonics.
But that was not my point. My point was that often a tube will get condemned because it makes a brief noise when tapped (because ALL TUBES ARE MICROPHONIC to some degree) which is entirely 100% normal.
Also, PLEASE read the Tomer book section I mentioned. Because as I mentioned before in my quote from Kevin Deal, the susceptibility of a tube to displaying excessive microphonics is dependent on
a) the environment in which the tube is operated, and
b) the circuit in which the tube was used
Tomer explains this VERY well, it's a terrific book - and it's free in .pdf form.
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Follow Ups
- RE: Jim, it's pretty easy with a George Kaye small tube checker - Jim McShane 06:52:41 02/25/14 (0)