tommytubetone
Great Lakes
Hmmmm. If there is nothing strange going on electrically in your house, we can probably eliminate a bad neutral splice somewhere. Those will create havoc. That being said, the problem has to be gear related. Are you using a pedalboard? My foot likes to knock cables out just enough to cause hum. Other than that, there has to be a common thread between all the gear you've tested. I wish you luck, but if you have to dig into the house wiring, you might want to have a reputable electrician come out.