Hi, I'm making the move to the UK from the States. I have a Denon 3803 running 120 V / 60hz. I bought a voltage converter for 220 V, but I was told that it still may not working since its frequency is at 60hz instead of the standard 50Hz? I also have a Denon DVD-1600 that is running the same - 120 V / 60Hz. (I'll only use it for my own DVDs but would need a multisystem TV (NTSC/PAL) With both running at 60Hz freq, are they useless even with a voltage converter? Thanks in advance.