On 23/05/2018 15:24, Brian Gaff wrote:
Its not the cps its the voltage it runs on. All the hz or cps means is that
on a uk mains it will run slower. In the old days of turntables and tape
decks powered by synchronous motors you often had to change the pulley to
compensate one way or the other, the motor was the same either way.

Not quite true. Some American stuff is made to only work on 60Hz 110v ac
and relies on either mechanical resonance at 60Hz or very marginal
transformer/electromagnets that go into saturation on UK 50Hz mains.
Those awful US razors heavily advertised round Xmas being an example.

My first job in industry was to work out why a particular US made colour
monitor was inclined to catch fire from time to time in the UK. Answer
the PSU had never been designed to cope with UK mains frequency and
frame rates. It worked well enough when used intermittently that there
were a lot of them installed before it showed up as a serious problem...

Everything Japanese is designed for either frequency since half the main
island is on US generator kit and the other on British!

The brushed motors if the same voltage is applied will probably not make
much difference.

However as I say, many countries use lower voltages at 60hz and if you
bring them over here you will need some kind of transformer to run them
without burning them out. The other way around they will lack power and revs
but are not likely to burn out unless you stall them.

You can buy auto (or isolating) transformers to take UK mains down to
appropriate US or Japanese voltages. I'd be wary of US kit powered on UK
mains - their insulation standards are not really up to it either.

--
Regards,
Martin Brown