Electratig is one of our own! Look on the Music And Movies Forum for past archived articles he did. Thats his thing; exposing us to music not usually heard. He has about ten reviews of which I picked up six and enjoy them all. The wal-wart introduces no hum at all; I purchased mine from Parts Express; the 2amp version isn't that common. If you want to go to a small motorcycle battery or something it means doing some soldering.