Go to www.psaudio.com and inform yourself about their powerplants. The 300 model would probably do for you. It will build up your necessary AC from scratch, so that you have good clean power. You can then fiddle with the voltage from 100 to 120 and find a spot where the buzz just goes away. But then you can also vary the frequency of your power from 60 to 120 hz and also find the ideal position to silence your transformer, with the voltage as high as possible. You will probably also find, that picture and music quality has improved. Its an expensive tweak. I would try it only, if all else fails. There is lots of good advice above. Good luck!