I have an AL-811H amp that does that. I put a
couple of bricks on the top of it when it was in
use (now have KAP500) and that cured my AL-811H :-)
Phil W7OX
On 9/14/14, 6:58 AM, Barry wrote:
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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