Amp trouble

Man I think some amps as you crank them are more noisey then others.  Circuit boards are supposed to help with this because there is less wires to pickup RF but also if you've bought a budget amp odd are Bugera didn't invest the money and time in developing a circuit board that was as noise free as say Fender or Marshall would have.  Consider it cutting corners.  On thing you might try is getting the amp on a power conditioner such as the Hum X or something from Furman.  AC power carries radio frequencey (RF) and a power conditioner would filter out some of this.  A cheaper thing to do is isolate the outlet that you are using and make sure the amp is the only thing plugged in using power off of the line.  Another problem most amps have is Transformers.  Unless your buying a custom amp or something just about all the amps today sold in stores have too small of Iron in their transformers and they just don't hold up or proform like older amps once did or like the rebuild kits have.  Its a cost saver.  Last you can open the amp and see if they put any kind of  shielding on the cabinet to protect the circuits from picking up RF as lack of shielding leaves you open to anything, CB Radios, Cell phones, home phones, anything in the air!  Thats the best I can offer other then replace the amp.