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DIY For Audio
Rotel RB985 hum/ buzz
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<blockquote data-quote="pwatts" data-source="post: 778162" data-attributes="member: 146"><p>It may be time to call it a day on this beast unless you like a challenge on time and money. Sounds like my Sunfire project.</p><p></p><p>The 985 has (once again going on memory of when I analyzed and simulated the whole circuit diagram) a protection circuit that clamps the input to ground with two triggers: thermal, turnon delay and (possibly) DC offset but I may be wrong there.</p><p></p><p>The 985 is an exceptionally quiet amp though - you can perhaps use it in another house to just confirm the hum isn't AC related. I don't think the 985 chassis connects to safety earth.</p></blockquote><p></p>
[QUOTE="pwatts, post: 778162, member: 146"] It may be time to call it a day on this beast unless you like a challenge on time and money. Sounds like my Sunfire project. The 985 has (once again going on memory of when I analyzed and simulated the whole circuit diagram) a protection circuit that clamps the input to ground with two triggers: thermal, turnon delay and (possibly) DC offset but I may be wrong there. The 985 is an exceptionally quiet amp though - you can perhaps use it in another house to just confirm the hum isn't AC related. I don't think the 985 chassis connects to safety earth. [/QUOTE]
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DIY & Tutorials
DIY For Audio
Rotel RB985 hum/ buzz
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