[Elecraft] OT: Audible hum from Astron linear power supply. Fixable?

[dmb at lightstream.net]

A stack of about a year's worth of QST magazines placed atop the power
supply does the job here. I believe other magazines would also work.

73, Dale
WA8SRA


> 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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