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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