I'll lay long money down that you can run them at 50Hz.
unless it's a (VERY old) television mains-derived frame-sync timing, or synchronous motor issue (turtables, B3 tonewheel motor, leslie motors etc) then There's no problem.
Look at the first picture and apply a moment's thought, if you could.
That device runs quite happily at 60Hz... -
they say so on the next line down!!!
The only reason that they say 120V 60Hz and not 50Hz is that 120V is ALWAYS 60Hz.
The second device is also 'configured for 120V 60Hz'. They just say 60Hz because 120V is ALWAYS 60Hz.
If the regulator dropout margin is so tight that 50Hz ripple (being about 20% longer between pulses) will be exposed, then what you have there is a piece of crap gear.
Run them at 50Hz. I'll make a bet with you that they all work PERFECTLY. Not a single one of the devices you've listed takes any timing or speed information from the mains, and all have adequate power supply designs. -When I win (
not "if"!!!) you can pay me out of what you saved! :wink:
Keith