Transformer hum with AC fluctuations


I was about to buy an isolation transformer (Tripp Lite) in hopes of cleaning up my inexpensive CDP's sound a bit (Tobias's rec on the cables forum), and now I've run into another AC-related problem.

I live in an old, small rural town in PA, and this time of year power demands start overwhelming our grid: our lights dim for brief moments (a second or so) and then come back to normal all evening long. Coinciding with that--and only at high-usage times on the grid--the transformer of my NAD C325BEE has started making a hum that's audible from across the room. The trannie has always hummed faintly (had to put my ear above the amp to hear), but now it's hard being in the room with it. It doesn't come through the speakers or headphones.

I have two questions: is an isolation transformer likely to hum just as much as my NAD's transformer? and is there a better route to cleaning up my AC (the kicker: within a $200 budget)? I appreciate any other suggestions/solutions. Thanks in advance.
ablang
So I spent part of yesterday thinking I needed a new amp stand and searched out the Symposium and others and decided to make a switch after Christmas.

And then last night not a peep out of those transformers whatsoever.

Talk about audio nervosa!
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I'm guessing that you both have a power issue, whether from inside or outside the house, who knows? I have also been told that sometimes some blue-tac can help dissipate the resonance.