> Aleksander Zawada - whom most of you will know for his homemade Nixie tubes - 
> uses 1% Argon in Neon. But I do not think that the amount of Argon in the 
> percent range is too critical, since argon is only a very small part of the 
> penning mixture and is only used to lower the breakdown voltage.

For the lowest breakdown voltage, the percentage has to be pretty close.  
However, anything nearby will lower
the breakdown voltage, just not as much.

> So I just have to start somewhere, and I think for that purpose the 2% 
> solution should be fine, right? ;-)

Yup, 2% Ar will work just fine.  Striking voltage may be a little higher, 
maintaining voltage should be about the same.

I'm guessing a CD tack welder and some bent wire cathodes (like Aleksander 
uses) might be a quick place to start.

If you care to try photoetching cathodes, you're welcome to use this:

http://www.vitriol.com/images/tech/nixies/cathodes.gif

- Cheers,
John

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