Might operating a 50Hz unit at 60Hz affect sound?

I live in the US and will be moving overseas soon, where the power is 220V/60Hz, hence I need to solve this.

I could have my cdp, pre, amp switched to 220V. This is easily done. However these are 50Hz units, to be operated at 60Hz. Anybody knows if I'm likely to hear any difference? I guess it's all direct current inside the units...

Can a power regenerator take 220V/60Hz and deliver 110V/50Hz? Might be another option.

Thanks in advance!