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Help! Tube noise problem: high-pitched whine, and tearing paper

It just started, after about 10 years. Tube preamp and tube monoblocks; it's one monoblock that's developed the problem(s). Neither noise is loud, but it's slightly annoying. Noise #1 is constant but fades out for a second, then comes back; noise #2 is intermittent (it stop sometimes for an hour or so). Any ideas? Maybe at this age the tubes are wearing out? Or maybe it isn't the tubes at all? I don't see anything that looks abnormal, visually. They were built from kits by me.


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Topic - Help! Tube noise problem: high-pitched whine, and tearing paper - Dr. Philosophy 13:47:04 02/07/12 (5)

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