Good Idea using standoffs to equalize the tubes. Because the tubes are SO 
irregular, I found it worked best to eyeball them and take measurements 
with a 6" steel rule. I really like these little tubes though! Built 3 of 
them and am considering buying/building another 

http://www.badnixie.com/Jurgen_Graus_ITS1A_B_Thyratron_Clock.html

On Friday, October 2, 2015 at 12:18:18 AM UTC-7, Dekatron42 wrote:
>
> I haven't built this exact clock but when I used these tubes I used a 
> piece of clear plastic which I drew both horizontal and vertical lines on 
> that corresponded to the four rivets inside the tube as well as the 
> segments and then used a piece of double sided tape on the front of 
> each tube to fasten them to this piece of plastic so they stayed aligned 
> when soldering, I also used paper shims between the tubes and rubber bands 
> to keep the tubes grouped together. I also used standoffs on the PCB so 
> that I could put the tubes face down on the table with the PCB above them 
> at the right height.
>
> The original Russian designs I have seen usually used silicone glue around 
> the tubes to completely encase them so they stayed in place and then the 
> pins were bent and soldered to solder posts at the back of the PCB, the 
> pins usually had a plastic sleeve to make sure that there were no short 
> circuits.
>
> /Martin
>

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