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  #1  
Old 2nd November 2015, 01:41 PM
Phil Y's Avatar
Phil Y Phil Y is offline
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Default Noisy mains transformer.

Hello all,

The mains transformer in my phono stage has always buzzed a little but lately has been getting worse. It is mounted on grommets and I have checked that the bolts through the stack are tight. It seems to be worse when it is cold, it can easily be heard from the listening position. When warm, it is just audible from seated.

Is there anything that can be done, ie potting compound, to quiet it down or is the only solution changing the transformer if I can't tolerate it?

Phil.
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  #2  
Old 2nd November 2015, 04:51 PM
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Ali Tait Ali Tait is offline
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Default Re: Noisy mains transformer.

You could try swapping the IEC inlet for a DC blocking one, see if that helps.
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Old 3rd November 2015, 12:05 PM
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Phil Y Phil Y is offline
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Default Re: Noisy mains transformer.

Hello Ali,
I had vaguely heard of this so did a bit of reading up last night and it would appear it only really applies to big toroidals.
Besides, this Tx has always been noisy, it is just that it has got worse. It buzzed when it was sat next to the 2 silent Leak St20s I used to own. I think it is just another victim of modern transformer manufacturing.

Phil.
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Old 3rd November 2015, 02:19 PM
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Ali Tait Ali Tait is offline
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Default Re: Noisy mains transformer.

Another option is to send it to a tranformer manufacurer to have it re-dipped in varnish.
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  #5  
Old 6th November 2015, 10:29 AM
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Phil Y Phil Y is offline
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Default Re: Noisy mains transformer.

Just considering my options, would something like this:
http://www.angela.com/hammondpowertransformer369gx.aspx
be suitable for running a WD phono with EZ80 rectification ?

Phil.
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  #6  
Old 6th November 2015, 01:08 PM
John Caswell John Caswell is offline
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Default Re: Noisy mains transformer.

Hi Phil,
Which phono stage is it?

John
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