I have a ground loop somewhere in my house.  You know how boring that
is to find, and how expensive it is to pay someone else to find it.
Well it gets hum in to the tv audio outputs in to the amplifier and
speaker systems, that I use for that purpose.
So do any of you know where to find an audible polarity checker that
I can plug in to each of mmy outlets until I find the problem?
How fun!!!