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Re: Microphony, always tubes fault?

Bambi,
There are 2 distinct noise and they occur without switching anything. One is a ping with a echo(actually both channels, but worst in left) and the other is like a rat-a-tat-tat, almost like opening a noisy zipper. The preamp is a Marsh p2000t and the tubes are National 5687. I don't have a phono, been running CD. Thanks for the help.


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