I have a new Deluxe clone hand-built by a reputable operation. I notice that if I play on it for an hour or two the chrome on the top of the chassis, on the side of the power and standby switches, gets VERY hot. Too hot to be able to touch with a bare finger for more than about 5 or 10 seconds. There's a Mercury Magnetics transformer under there, and the tubes are pretty standard JJ and Electro-Harmonix. Is this normal? Should I do something about it?