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DIY For Audio
Rotel RB985 hum/ buzz
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<blockquote data-quote="thenoizeguy" data-source="post: 778290" data-attributes="member: 14345"><p>Download the service manual from hifiengine (its there,just checked ).</p><p>It shows you exactly how to set the bias with a multimeter that has a millivolt setting.</p><p></p><p>I bought an RA 820BX3 that had buzz and a sort of "ocean " noise.</p><p>I did the bias and idle current settings according to the hifiengine manual, and it sorted it 100%. Buzz and noise completely gone.</p><p></p><p>I knew absolutely JS about what I did, but tweaking very slowly until I got the right voltage did the trick.</p><p>I would recommend using a plastic trimming tool set which is available at Communica. </p><p></p><p>Worth a try.</p><p> </p></blockquote><p></p>
[QUOTE="thenoizeguy, post: 778290, member: 14345"] Download the service manual from hifiengine (its there,just checked ). It shows you exactly how to set the bias with a multimeter that has a millivolt setting. I bought an RA 820BX3 that had buzz and a sort of "ocean " noise. I did the bias and idle current settings according to the hifiengine manual, and it sorted it 100%. Buzz and noise completely gone. I knew absolutely JS about what I did, but tweaking very slowly until I got the right voltage did the trick. I would recommend using a plastic trimming tool set which is available at Communica. Worth a try. [/QUOTE]
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DIY & Tutorials
DIY For Audio
Rotel RB985 hum/ buzz
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