In article o.uk, Dave
Liquorice writes
snip

Check the size of the smoothing capacitors, IIRC they don't need to
be quite as big at 60 Hz as 50 Hz. Not critical unless this thing is
going to be driven hard, which may cause the supply to have rather
more ripple than intended.

Electrolytic caps are often +50% -20% tolerance so the difference
between 50Hz and 60Hz (17%) is probably not important in this case.

--
Chris Holford