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Help. Hissing sound from amp on left channel.Rotel RA 1070
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<blockquote data-quote="fredeb" data-source="post: 1117237" data-attributes="member: 13623"><p>I meant to send you picture of positions of those 2 resistors , then load-shedding struck . Thank heavens Handsome checked it out . </p><p></p><p>Bias should be adjusted to read 5mV over either resistor (also check that value of either resistor hasn't drifted , as [USER=772]@handsome[/USER] suggests) .</p><p></p><p>It appears there is no manual offset adj , but offset should still be close to 0mV on both channels channels . If either one of them is over 100mV , that would seem cause of concern , for me - but perhaps I'm too paranoid .</p><p></p><p>I think resoldering the old solder joints would be a good idea . The hum/touch routine would point to bad grounding somewhere on that bad channel .</p></blockquote><p></p>
[QUOTE="fredeb, post: 1117237, member: 13623"] I meant to send you picture of positions of those 2 resistors , then load-shedding struck . Thank heavens Handsome checked it out . Bias should be adjusted to read 5mV over either resistor (also check that value of either resistor hasn't drifted , as [USER=772]@handsome[/USER] suggests) . It appears there is no manual offset adj , but offset should still be close to 0mV on both channels channels . If either one of them is over 100mV , that would seem cause of concern , for me - but perhaps I'm too paranoid . I think resoldering the old solder joints would be a good idea . The hum/touch routine would point to bad grounding somewhere on that bad channel . [/QUOTE]
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Audio and Video Talk
General Discussion
Help. Hissing sound from amp on left channel.Rotel RA 1070
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