Microphonic?

Tubes Asylum

Questions about tubes and gear that glows. FAQ

System
Wright WLA12A
McIntosh MC30s
Azur 640C CDP
Klipsch Belles
What exactly does it sound like when tubes go microphic? Do they do it all the time or just on certain recordins at certain volumes?
I was listening last night and just through on a couple cds when I thought I heard a slight rining sound like a whistle. I turned the volume up and down and it was there but not on all recordings. I tapped the WLA12A and I could hear the tap through the speakers which was odd as it doesn't do that all the time. It actually stopped after I turned everything off and then back on but to be on the safe side I rolled my JAN Tall 6SN7 SYL out and rolled in my other short sylvanias. I listened a while longer and tapped on the preamp with nothing coming out of the speakers. I thought all was well till I was listening to the O'Brother soundtrack and I heard a slight whistle not as loud as before but it sounded a little like guitar feedback..... I guess the question is could this be on the actual recording or do I still have a microphonic tube somewhere or something else? Or is it in my head...hope not.
Any advice appreciated.
Thanks

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Kimber Kable

Topic - Microphonic? - Iain42 08:59:40 02/14/07 (2)

Re: Microphonic? - lipmanl 11:30:54 02/14/07 (0)

A microphonc tube acts as a microphone. It picks up and transmits .... - PureAudio 10:00:45 02/14/07 (0)

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