When I turn on my Triple Rec I am getting a popping noise through the speakers. It pops like every 3-5 seconds and sometimes just keeps popping. It doesnt matter if I change channels either, IT STILL DOES IT. It is the 3-channel model. I am not sure why it is doing it. I have it plugged in to a Monster Cable Pro 800 power conditioner and have never had a problem before. I also tried plugging directly into the wall and the problem was still there...All of the tubes look fine (i.e. no arcing). Could it be that my house has "dirty" power. It never did this when I had it at my friends house (where my band typically practices)...ANY help would be greatly appreciated...