I just got this used amp and have a problem. Based on the info from the seller, this problem always existed. Each time I turn on the Main power, the fuse protecting the circuit the amp is connected to, breaks. Or, in case of my flat, the switch of the flat's electricity turns itself down. The problem can only worked around by connecting the amp to the power socket via a 20m (approx. 60 feet) power cord extension cable. I live in Europe so it's possible that someone fiddled with the amp's power properties so it can be used with 220V not only 110V. Anybody experienced this before?