>  - while testing it I found out that striking voltage of tubes is a max value 
> - I've tested one Z567M and one LC-631, they both strike with voltages lower 
> than their normal maintaing voltage!

Yes, it's a maximum value, so people can design circuits that are guaranteed to 
strike even with a worst-case tube, under worst-case conditions (see below).

> I wonder if this low striking voltage is common among different tubes or does 
> the striking voltage change with temperature.

Temperature has a minimal effect on striking voltage.  The big factor is 
something to start the ionization cascade.  If the tube is exposed to light, 
photons will do the trick.  Radiation of other forms will as well.  Worst case 
is in absolute darkness.  For some designs, striking speed also matters: the 
higher the voltage, the faster the tube will strike.  For some designs this can 
matter.

One workaround is to have a "primer" electrode, to provide a source of ions to 
start the tube.  While nixies don't normally come with primer electrodes, you 
can use a decimal point as a primer, just hook it up via a very large 
resistance.  This will reduce the striking voltage and time significantly in 
the dark.

- John

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