So here is my problem. I get a high pitched whine in my house when using single coil guitars. No, it's not single coil buzzing. And it happens anywhere in my house. I don't get it anywhere else, so I know it's not the cable or instrument or amp. The frequency is centered at 7.3khz. It's so pronounced that I have to insert a notch filter to an aux in in Pro Tools when recording. Fortunately, the bandwidth is so narrow it doesn't impact my tone all that much. Any thoughts? I dont think this is merely a 'check your light bulbs' thing. It's everywhere. I"m wondering if there is an issue with the electrical in my house. I tried one guy but he didn't have a clue and didn't seem all that interested. My house is fairly new, 2001, with 2 200amp boxes. Any ideas appreciated. UPDATE. So, we figured it out. It was the dog fence. Gotta thank my wife for thinking of that one.