I have an Astron RS-70M that I use to power the station. It on the carpeted floor under a desk. It's probably 30 years old now. I've been inactive for several months, so it's been off all summer. Now when I turn it on, it has an annoying, low-pitched audible hum. All the screws are tight, though when I press down on the top of the case, it goes away. Any thoughts on how to quiet it down? Tnx, Barry W2UP
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