I used to own an SLI-80 and it was silent. Is there a cable tv coaxial cable nearby causing the hum?
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Best thing to do first to be sure it is the Cary is to disconnect all components from it and plug it into the wall (if you have done this already my apologies). Is the hum still there? If yes then it is the Cary, if no, something further up the chain is causing it. Add one component at a time starting with the PS Audio until the hum appears. Cheater plugs are great for diagnosing the problem. You'll read all sorts of stuff here about the positives and negatives of their use on a permanent basis. I don't like them as a rule but sometimes you may just have to live with them, or get a balanced power conditioner.
I have a SLI-80 and its dead quiet. To clarify, is the hum coming from the speakers or from the Cary itself? If through the speakers, does the hum come through both speakers or just one? If its just from one side it could be a bad tube. To test you could swap the tubes from one side to the other to see if the hum changes sides. If so, then swap out one tube at a time on the side with the hum until it disappears.
Since the hum is immediate upon firing up the amp, it doesn't really sound like a tube to me, but you may want to try the above just to start ruling things out. As recommended, give Cary a call - they have great customer service in my experience.
Thanks for all the feedback. Will call Cary. By the by, the hum is from both speakers. Will also try a 3-prong to 2-prong plug from Cary into PS Audio. If that doesn't do it, I will try the 3-prong to 2-prong from PS Audio into wall outlet. I'm guess you mean one or the other, Ianman. Am sure I will sort it out. Thanks again.