Hi John,

They did not light.  The kit is running 170v across a 220k resistor. 
 Interestingly, they did not light when held next to a plasma ball.

- Bill

On Saturday, June 13, 2020 at 9:35:06 AM UTC-4, jrehwin wrote:
>
>
> I happen to have a few of the NHK GD412-200V spark gap tubes.
>
>
> Nice!
>
>    I accidentally thought they were neon bulbs and installed them on the 
> Wemos Nixie Clock kit from Ian at Nixieclock.biz <http://nixieclock.biz/> (a 
> great kit btw.)
>
>
> Oops, did they light?
>
> What voltage is needed to cause them to glow?  Since these are 200v spark 
> gaps, I am assuming a voltage over 200, but and curious what you used.  Did 
> you ever use them for a project?
>
>
> I don't recall the voltage I used, it was using my Heathkit supply which 
> can offer up to 400V.  I also don't recall what series resistor I used. 
>  I'll have to lash it up again.
>
> I only have a couple of them, so I'm waiting for just the right project.
>
> Cheers,
> John
>
>

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