Hi, guys.
In the US, where the mains frequency is 60 Hz, the Commodore Amiga, my favourite computer, produced a 60 Hz video signal and so did all native TV systems. In the UK, where the mains was 50 Hz, all TV systems and computer systems ran at 50 Hz.
Did the TV refresh frequency ever actually sync to the mains power frequency?
To put that another way, would there ever have been a problem running a 50Hz TV system on US power, or running a 60 Hz system on UK power?