---------- Original Message ----------------------------------
From: tom behler <[log in to unmask]>
Reply-To: For blind ham radio operators <[log in to unmask]>
Date:          Tue, 24 Aug 2010 21:42:23 -0400

>Hi, all.
>
>I don't know whether it's because of being jolted around in the move or 
>what, but my trusty metered Astron RS35 power supply seems noisier than it 
>used to be.
>
>It still works fine, but seems to have a louder hum than it used to have.
>
>I have it set up in exactly the same way I did out in Colorado, on the top 
>shelf of a sturdy ham operating desk.  I even put some padding underneath 
>the supply, but it really didn't seem to do much.
>
>I suppose I could take the cover off, and try to feel around to see what 
>might have happened, but I know there are some electrolytic capacitors in 
>there that would not make for a pleasant experience if they were 
>accidentally discharged.
>
>If anyone has had this experience, and has any suggestions, please let me 
>know.
>
>Again, the supply still works fine;  it just lets me know it's around more 
>than it used to.  (smile)
>
>73 from Tom Behler:  KB8TYJ
>
Tom,

These things are notorious for the hum.  I've got 2 of them and  over the years have heard the hum a few times.   It's usually caused by the cover itself.   Remove the cover and turn the supply on and a very good chance the noise will be gone.  Sometimes just putting the cover back on and retightening the screws will resolve the problem.    some guys will jam little bits of cardboard or something in the small space between the cover and front/rear panels to dampen the noise, but I've never had to do it.    You can always set a brick on top of it to quiet it down.

73, Steve KW3A