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[Amps] filament transformer is buzzing?

To: <amps@contesting.com>
Subject: [Amps] filament transformer is buzzing?
From: "Szegedy" <szegedy.zolilaci@t-online.hu>
Date: Sun, 13 Sep 2009 20:33:11 +0200
List-post: <amps@contesting.com">mailto:amps@contesting.com>
Dear Friends!

Thanks the answers!
How can I check what causes this buzzing noise? Wrongs electrolytic caps in the 
power supply or filament transformer winding problem?
I moved out the power supply,but from the caps comes nothings.
My question:Can I measure voltage on the filament transformer?I like to know 
that it is mechanical sound or electronical problem in the filament transformer.
I found a article,What does it mean?:The buzzing noise is caused by a short on 
the DC output of the 
halfwave-rectified 80V-rms. winding on the filament transformer.
My filament transformer will be bad soon?Do I need to change a new filament 
transformer?Maybe I have this problem?

The article is :
      [Rich Measures] [Permanent Link][Original] 

      To:  <amps@contesting.com> 
      Subject:  [AMPS] Kenwood TL922 help please 
      From:  measures@vc.net (Rich Measures) 
      Date:  Thu, 28 Aug 97 01:19:29 -0800 

...... ....
>... ... the TL922 needed a new home. One problem, one of
>the tubes had developed an intermittent grid short (apparently there was
>a buzzing noise just before the amp died) 

The buzzing noise is caused by a short on the DC output of the 
halfwave-rectified 80V-rms. winding on the filament transformer.  Since 
the rectified / filtered output of the 80v winding is used to bias the 
3-500Zs off during receive, a grid short also shorts the supply and that 
destroys the filament transformer in short order.  
What follows is an out-take from an article I wrote on the 922.  The 
entire article on circuit improvements for the TL-922 is available at:
http://www.vcnet.com/measures
 
                                                                               
Thanks:Laszlo  


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