I would disconnect your pre-amp cables to the amp, then turn it on. If either of these problems persist when the pre-amp is not connected you should send the amp back to Levinson. My guess is the pop will still be there--I am not sure about the hiss--but you want to know so that you can give that info to Levinson when you send it back. I hate sending things back for repair (no music for a while), and Levinson will tell you it will be 3 weeks before you get it back--but in general they are much faster. I got most of my stuff back inside a week and almost always inside 2 weeks.
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