Danele wrote
Did not work.. tried a standard 3 prong plug, the humming still persists. funny thing is, if i remember correctly, when i went to test the amp before purchasing, it didnt hum at all with the drive all the way up.
That means the environment changed. So are you sure your power is "clean", in the sense of there aren't any applications connected to the same electrical source that can cause interference - this can easily happen. If you have electrical fencing it is most likely that as well.
That is why bigger performers use power conditioners to keep their rigs power "clean".