I have a robertson forty ten amplifier that I am having a noise problem through the left channel. The strange thing is the noise is loudest with no RCA cables plugged in but once I do plug them in most of the noise goes away (although not completely). I opened up the amp and see no burned components, checked for any loose grounds but found none. I took a few electronics classes years back in school but don't have much experience, any ideas of what to look for would be greatly appreciated.
Thank you for the quick response. I see the main chassis ground, what exactly are you talking by the input ground?
http://users.ece.gatech.edu/mleach/lowtim/graphics/ckt.pdf
R51 on this diagram.
http://www.hafler.com/techsupport/pdf/DH-200_amp_man.pdf
R45 on this diagram.
R51 on this diagram.
http://www.hafler.com/techsupport/pdf/DH-200_amp_man.pdf
R45 on this diagram.
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