I'm using a switch mode boost converter with a 9VDC input, so I think i'm 
good on that count.  The high voltage is scary enough, I don't think I'd 
want to run the nixies directly from mains :/.  I think I'll go with the 
10k unless anyone thinks I should be more conservative and use a 15k.  If 
anyone can clear up the point that GastonP made about the duty cycle, that 
would be awesome.

On Wednesday, June 7, 2017 at 12:31:12 PM UTC-4, Tomasz Kowalczyk wrote:
>
> 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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