Hi guyz, i just bought a used dual rectifier and when i first turn it on (and the standby is on) with the footswitch plugged in it gives a buzzzz noise coming from in the chassy and all the lights on the front of the amp come on 1 at a time for the duratiion of the buzz ,when the footswitch is not plugged in it won't do it. i called mesa and they said that was normal in a certain series of rectifiers but i hate that sound anybody else's do that? Can it be fixed? The guy i bought it from said it has always done that.