Hey all, I am hoping some of you have experienced the same thing that I am fighting currently. I have a WW Ultra circa 2003 that is in great shape. Unfortunately, in certain buildings with older wiring, I get either 60hZ hum, or a high pitched whine. This does not happen everywhere, but sporadically. It is affected by stage lights when on the same circuit. I do carry the ground adapters (the gray 2 prong from 3 prong) and it does not seem to make a difference. Can anyone recommend a product or procedure that can help alleviate the curse of dirty power?