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Astron hum/vibration

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Barry

Astron hum/vibration

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

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riese-k3djc

Re: Astron hum/vibration

set something heavy on top of it ?

Bob K3DJC

On Tue, 17 May 2011 09:28:44 -0600 Barry <[hidden email]> writes:

> 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
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>

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Jerry K8RA

. Re: Astron hum/vibration (riese-k3djc@juno.com)

In reply to this post by Barry

I had the same experience with an Astron 50A model. I just started doing it
overnight. I opened it up and narrowed it down to hum in the power
transformer. I actually removed it and try to tighten the 4 bolts holding
the lamination of the transformer together. I could get it to change pitch
but I was unable to eliminate it. I ended up moving it to the work bench
and getting a new one for the station. De k8ra jerry in ohio

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John Harper AE5X

Re: Astron hum/vibration

In reply to this post by riese-k3djc

> It goes away if I press down on it. Any ideas how to get rid of the noise?
> Tnx,
> Barry W2UP

Press down on it.

John AE5X
http://www.ae5x.com/blog

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KXBill

Re: Astron hum/vibration

I agree...should work fine, last a long time.Bill w7kxb

> From: [hidden email]
> To: [hidden email]
> Date: Tue, 17 May 2011 11:25:30 -0500
> Subject: Re: [Elecraft] Astron hum/vibration
>
> > It goes away if I press down on it. Any ideas how to get rid of the noise?
> > Tnx,
> > Barry W2UP
>
>
> Press down on it.
>
> John AE5X
> http://www.ae5x.com/blog
>
> ______________________________________________________________

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Barry

Re: Astron hum/vibration

In reply to this post by John Harper AE5X

<quote author="John Harper AE5X">
> It goes away if I press down on it. Any ideas how to get rid of the noise?
> Tnx,
> Barry W2UP

Press down on it.

John AE5X
http://www.ae5x.com/blog

Thanks John.
A takeoff on the old joke - Doc, it hurts when I breathe. What should I do?
Don't breathe.

On a serious note, thanks for the replies to the list and private. I took a cable tie, cut it into a few 2 inch lengths, and wedged them in the small space between the front panel and the top cover. Problem solved. The PS is now as quiet as can be.

Barry W2UP

Steve Ellington

Re: Astron hum/vibration

In reply to this post by Barry

>From my experience....Once it starts, there's no cure. I think the windings
in the transformer eventually start rattling around inside....Maybe you
could talk to Astron?

Steve
N4LQ
----- Original Message -----
From: "Barry" <[hidden email]>
To: <[hidden email]>
Sent: Tuesday, May 17, 2011 11:28 AM
Subject: [Elecraft] Astron hum/vibration

>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
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

daleputnam

Re: 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
> >

>

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AC7AC

Re: Astron hum/vibration

CONTENTS DELETED

The author has deleted this message.

Steve Ellington

Re: Astron hum/vibration

In reply to this post by daleputnam

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

Steve
N4LQ
----- Original Message -----
From: Dale Putnam
To: [hidden email] ; [hidden email] ; [hidden email]
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
> >

>

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Post: mailto:[hidden email]

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KXBill

Re: Astron hum/vibration

In reply to this post by daleputnam

I like the "putting your hand on top" method. Cheap and not as messy.BillHarris-w7kxb

> From: [hidden email]
> To: [hidden email]; [hidden email]; [hidden email]
> Date: Tue, 17 May 2011 13:05:56 -0600
> 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