This is my first post in forever. My NAD T742 AV Receiver has developed a humming sound. The humming is heard through the speakers and it seems to reduce the audio about 90%. That is when a movie, tape or T.V. is being played the humming dominates the sound coming from the speakers. Its as though the audio volume has been turned down 90% and the humming is heard over it. Not because the humming is so loud that it overpowers sound of the audio at normal volume. The humming also comes and goes and each time it returns it takes longer to disappear.
What is happening to my receiver? Thanks in advance for any help you can provide. Happy Holidays.
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