Hi Everyone!, greetings from Chile I've purchased a SVT-450H solid state amplifier about 4 months back from now. From the very begining, this amplifier right after aprox 5 minutes of having it on produces a very loud and intermittent hiss, like a disconnected cable somewhere inside of it. Actually by turning the Master volume to 0, it stops. Apparently it isn't related with the Gain control because when I turn the gain up or down, the hiss sound don't vary. This hiss sound dissapears after a while of having the amplifier on (let's say about an hour) no matter if you were playing or not, it looks like after a 'warming up' period of 1 hour it gets stable somehow. Is this a normal behaviour?, is there a reported incident about a similar issue with this equipment??, ANY CLUE???...thanks a lot my felow bass players!!