If you're using a wall wart and then a DC/DC converter, then it doesn't matter at all. All this 50Hz stuff comes from times when DC/DC converters weren't popular or cheap, so to make transformers smaller, the display was connected directly to mains, without any isolation. Some nixie clocks use it, I believe I've seen one project using biquinary nixies, where one anode was driven by one half of sine wave, and other anode was driven from the other. This method is generally not recommended for safety reasons - both user and tube safety, you should always isolate your devices from mains via a transformer or a wall wart.
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