I've used the Russian INS-1 for a colon 
separator.  https://tubehobby.com/show_det.php?det=9 
or https://www.ebay.com/p/707429259
See 
also https://hackaday.io/project/1940-modular-nixie-display/log/29161-ins-1



On Tuesday, September 1, 2020 at 1:28:25 PM UTC-4 [email protected] wrote:

> I had a few of these neon bulbs for colon separators in Nixie clocks, but 
> am almost out and would like to find more.  I originally found them at a 
> now defunct electronics surplus store (I think).
>
> They are nice because they have a lens at the top end instead of the 
> regular glass blob.  The envelope on this version is about 4.75mm, and the 
> full length of the glass is about 16mm.  
>
> If anyone know where you can find lens end neon bulbs I would appreciate a 
> pointer.
>
> - Bill
>
>

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