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 Post subject: Kenwood Buzzing Transformer
PostPosted: Mar Sat 14, 2020 4:57 am 
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Joined: Sep Tue 22, 2009 12:34 am
Posts: 161
Just a quick question. I have a Kenwood KR-3130 tuner amp. It works fine, powers on fine, but after about 15 minutes of operation the power transformer will making a buzzing noise, not coming from the speakers but coming from the transformer itself. It continues to work just fine despite the small bit of noise. Is there anything in danger here? Thanks.


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 Post subject: Re: Kenwood Buzzing Transformer
PostPosted: Mar Sat 14, 2020 5:17 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 16624
Location: Albuquerque, NM 87123
No, but if it has screws with nuts you can try tightening the nuts.


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 Post subject: Re: Kenwood Buzzing Transformer
PostPosted: Mar Sun 15, 2020 7:48 am 
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Joined: Sep Tue 22, 2009 12:34 am
Posts: 161
Thank you! I'll check it out when I get a bit of time.


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 Post subject: Re: Kenwood Buzzing Transformer
PostPosted: Mar Sun 15, 2020 8:49 am 
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Joined: Jul Mon 26, 2010 8:30 pm
Posts: 28438
Location: Annapolis, MD
+1 for simply tightening some bolts/nuts...

Sometimes, I've needed a more extreme solution. First, LOOSEN the bolts/nuts that hold the laminations together. You may then find that the stack expands a bit--i.e. lots of gaps open up. For these cases, I get the stack loosened up as much as possible with damaging the windings. Then, douse with shellac and immediately tighten the bolts.

But---another possibility is that the winding assembly is loose on the center pole of the lamination stack. In these cases, you need to insert some kind of tapered shim.

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-Mark
"Even if you don't understand Ohm's Law, you are still required to obey it."


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