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DIY For Audio
Power amp diagnostics / earthing advice: help needed
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<blockquote data-quote="LAV" data-source="post: 73457" data-attributes="member: 1123"><p>Thanks guys, Gert, you've got PM.</p><p></p><p>I can understand that the channel would hum without the input resistor, but what is very interesting is the high voltage I measure between the audio gnd of the Rotel and the audio gnd of the AVR.</p><p></p><p>The moment I take the mains earth off the Rotel, all hum (and funny voltages where they should not be) disappear.</p><p></p><p>Also, for these units, would mains earth and PSU ground usually be tied together somewhere?</p><p></p><p>The only other explanation has to be some kind of earth loop.</p></blockquote><p></p>
[QUOTE="LAV, post: 73457, member: 1123"] Thanks guys, Gert, you've got PM. I can understand that the channel would hum without the input resistor, but what is very interesting is the high voltage I measure between the audio gnd of the Rotel and the audio gnd of the AVR. The moment I take the mains earth off the Rotel, all hum (and funny voltages where they should not be) disappear. Also, for these units, would mains earth and PSU ground usually be tied together somewhere? The only other explanation has to be some kind of earth loop. [/QUOTE]
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DIY & Tutorials
DIY For Audio
Power amp diagnostics / earthing advice: help needed
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