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PostPosted: Mon Jul 31, 2017 4:27 pm 
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Joined: Mon Mar 18, 2013 7:51 am
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Hello everyone,

I have a Problem with the K8020 Valve Preamp. The amp works fine about 10-15 minutes, then the output level drops continuous to Zero on both channels (left and right), comparable to a fade out at the end of a song.
because the amp works fine at the beginning, i think it's a temperature Problem.

Can you give me an advice which components in the circuit i should check.

Thank you very much


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PostPosted: Sat Aug 05, 2017 1:45 pm 
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Joined: Mon Mar 18, 2013 7:51 am
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Is it possible that the IC VK8020 causes my problem? How can I check the IC?
Is there any chance to get a new one, because it's a programmed IC...


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