That's a hell of a solution Steve!  Wish I had thought of it!!
Pat, K9JAUAt 04:42 PM 12/12/2015, you wrote:
>Steve,
>
>This morning, I heard someone mention something he called "foam board,"
>which he said was available at Home Depot and was an effective cure for
>mechanical hum of the type Tom describes.  Apparently, the stuff comes in
>4-foot sheets and is about an inch thick.  Of course, another solution for
>the hum is to hire a rock band and have them play at full volume whenever
>the supply is turned on, at which point the hum will be a very minor
>concern.
>
>Steve
>
>----- Original Message -----
>From: "Steve Forst" <[log in to unmask]>
>To: <[log in to unmask]>
>Sent: December 12, 2015 16:38
>Subject: Re: Re-thinking New RS35 Power Supply Issue Again
>
>
> > Tom,
> >
> > Best cure for odd noises in the shack is a good pair of headphones.
> >
> > It won't kill you to check  and see if things are tight inside,  unless
> > you leave it plugged in while  waving a screwdriver around in there,
> > then it just might kill you.
> >
> >
> > Just getting the cover off and back on may  change things, maybe even
> > for the better.
> >
> > I would also follow the earlier suggestion of putting something under
> > the feet.   It doesn't have to be a big thing, just little  circles of
> > whatever under each foot.    Little half dollar size pieces of carpet
> > padding or whatever you can swipe  when your wife isn't looking.
> >
> >
> > Hum seems to be the nature of the beast with the Astron's, and some seem
> > to be worse than others.
> >
> > 73, Steve KW3A
> >
> >
> >
> >
> >
> > On 12/12/2015 4:23 PM, Tom Behler wrote:
> >> Steve:
> >>
> >> I guess I'm a bit puzzled as to why I didn't hear it with my older RS35,
> >> and
> >> other supplies I've used.
> >>
> >> All that aside, I think that tonight, I might take the cover off, and try
> >> to
> >> re-tighten all the screws to be sure everything is firmly in place.
> >>
> >> Then, I'll see if I can make some sort of a wedge out of folded Braille
> >> paper or something like that to insulate the top and sides of the cover
> >> from
> >> the main unit to cut down a bit on the vibration hum.
> >>
> >> Thanks for your patience with this, everyone.
> >>
> >> Tom Behler: KB8TYJ
> >>
> >>
> >> -----Original Message-----
> >> From: For blind ham radio operators
> >> [mailto:[log in to unmask]]
> >> On Behalf Of Steve Dresser
> >> Sent: Saturday, December 12, 2015 3:50 PM
> >> To: [log in to unmask]
> >> Subject: Re: Re-thinking New RS35 Power Supply Issue Again
> >>
> >> Tom,
> >>
> >> The increase in hum is normal.  It happens when you draw more current
> >> from
> >> the supply, and it happens with all power supplies.  As long as the
> >> supply
> >> is delivering the right voltage under load, you have no real basis for
> >> returning it.
> >>
> >> Steve
> >>
> >> ----- Original Message -----
> >> From: "Tom Behler" <[log in to unmask]>
> >> To: <[log in to unmask]>
> >> Sent: December 12, 2015 15:01
> >> Subject: Re-thinking New RS35 Power Supply Issue Again
> >>
> >>
> >>> Hello, again, everyone.
> >>>
> >>>
> >>>
> >>> I am now beginning to wonder if today is my day for Murphy to make a
> >>> visit
> >>> here, or just what exactly the deal is.
> >>>
> >>>
> >>>
> >>> I was working a bit of the 10-meter contest today, and noticed a further
> >>> problem with the hum issue on my new Astron RS35 power supply.
> >>>
> >>>
> >>>
> >>> I'm not sure why I didn't notice it last night when I did my testing,
> >>> but
> >>> now, I find that whenever I transmit in CW at any power level-i.e. 5
> >>> watts
> >>> or 100 watts, the hum on the RS35 slightly increases.  In other words,
> >>> when
> >>> I key down, I hear a slight, but noticeable increase in the hum at any
> >>> power
> >>> level.
> >>>
> >>>
> >>>
> >>> So, now, I'm trying to decide whether I actually should return the
> >>> supply
> >>> to
> >>> H R O.
> >>>
> >>>
> >>>
> >>> I have my receipt and all other documentation, but I'm wondering whether
> >>> the
> >>> folks at HRO would see this as a significant enough of a problem for a
> >>> product return.
> >>>
> >>>
> >>>
> >>> The supply still seems to carry the load ok, and does put out what I
> >>> would
> >>> expect in terms of output power readings, but the hum issue is a
> >>> noticeable
> >>> one now, on several counts.
> >>>
> >>>
> >>>
> >>> I don't mean to be obsessive about this, but I wouldn't expect to be
> >>> dealing
> >>> with this sort of issue with a newly-purchased power supply like this.
> >>>
> >>>
> >>>
> >>> I'd continue to be interested in anyone's thoughts.
> >>>
> >>>
> >>>
> >>> Tom Behler: KB8TYJ
> >>>
> >>>
> >>