[Elecraft] Astron hum/vibration

[Steve Ellington]

Hmmmm....Wonder if some quick drying epoxy would work?

Steve
N4LQ
  ----- Original Message ----- 
  From: Dale Putnam 
  To: n4lq at carolina.rr.com ; w2up at comcast.net ; elecraft at mailman.qth.net 
  Sent: Tuesday, May 17, 2011 3:05 PM
  Subject: RE: [Elecraft] Astron hum/vibration


  I've not repaired a high current xfrmr, like that one, but have the lower current ones... 
  With hum that is physical, and a vibration, that maybe caused by the varnish breaking its hold 
  and letting the individual windings rattle. 
    I may have just been lucky too... all I did was take the transformer shells off, exposed windings are now very visible, although only the top winding... and a cheap wager would be that it isn't the top one rattling... then very slowly pour new vanish onto the windings.
  Let it settle some, and add more.. yep,.. it is messy... very messy.. not something you'd want to do on carpet... or cement... or in a sink... trust me here... and that is another story.. really. 
    Let it settle in,.. add more.. when it seems to not want to do anywhere, but on your shoes... maybe now would be a good time to stop. 
    Let in air dry... for a long...long ... long.. time. well... ok.. tomorrow then. (24 hours.... it is always tomorrow somewhere)
  Put it all together... and hum.. away... well.. hopefully at least, it is away. 
  Have a great day, 

  --... ...-- Dale - WC7S in Wy

  > 
  > >I have an Astron RS70M linear supply that I've used for many years to
  > > power everything 12VDC in the shack, including my K3. In my former QTH,
  > > I had it located under the operating desk and never heard a peep from it.
  > >
  > > In my new shack, which is considerably smaller, I hear an annoying hum
  > > from it which seems to be coming from the top of the case. It goes away
  > > if I press down on it. Any ideas how to get rid of the noise?
  > > Tnx,
  > > Barry W2UP
  > >


  >