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<blockquote data-quote="littlematt" data-source="post: 879435" data-attributes="member: 25302">Those things apparently filter out any 50-60hz signal, including bass I think, so degrade the signal, therefore not really an option Im afraid. Thanks for the suggestion though....However...Heavier cable tying chassis together, no difference. On a hunch I tied the exterior of an RCA input to the chassis of the amp, wife says its gone (I cant listen up close, holding the wires on by hand). Out came the mulitimeter again...Went over all the earth points and there's continuity between the RCA ground and power plug ground so I figure it cant hurt. Make a permanent solution out of an old RCA lead, tie signal ground to chassis. Plug everything in, power up, very slight hum from driver and hiss from tweeter up real close <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite4" alt=":mad:" title="Mad&nbsp; &nbsp; :mad:" loading="lazy" data-shortname=":mad:" /> but marked improvement. So what is going on here? I pulled the amp apart looking for obvious dry solders, checked all the earth connections to PCB, chassis and line inputs against plug earth, seems fine (zero resistance at lowest setting on mm). SO I guess Im happy to put up with the end result, but is there any way this could be harmful to the amp? Paid a fair bit for it, dont want the magic smoke to come out...But if I can get rid of the hum entirely I would be much happier....Are ground loops potentially harmful to equipment anyway?Does the fact that what I did seems to help mean there is a poor connection within the amp?</blockquote>

[QUOTE="littlematt, post: 879435, member: 25302"] Those things apparently filter out any 50-60hz signal, including bass I think, so degrade the signal, therefore not really an option Im afraid. Thanks for the suggestion though.... However... Heavier cable tying chassis together, no difference. On a hunch I tied the exterior of an RCA input to the chassis of the amp, wife says its gone (I cant listen up close, holding the wires on by hand). Out came the mulitimeter again...Went over all the earth points and there's continuity between the RCA ground and power plug ground so I figure it cant hurt. Make a permanent solution out of an old RCA lead, tie signal ground to chassis. Plug everything in, power up, very slight hum from driver and hiss from tweeter up real close :mad: but marked improvement. So what is going on here? I pulled the amp apart looking for obvious dry solders, checked all the earth connections to PCB, chassis and line inputs against plug earth, seems fine (zero resistance at lowest setting on mm). SO I guess Im happy to put up with the end result, but is there any way this could be harmful to the amp? Paid a fair bit for it, dont want the magic smoke to come out... But if I can get rid of the hum entirely I would be much happier.... Are ground loops potentially harmful to equipment anyway? Does the fact that what I did seems to help mean there is a poor connection within the amp? [/QUOTE]

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