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Uses a custom made Nixie tube which is 4.5" tall and 2" diameter
Compared to a Russian IN18 Nixie tube
Where are you buying?
This was a Kickstarter project https://www.kickstarter.com/projects/767936743/blub-keo-a-supersized-usb-powered-tube-clock
The Nixie tube is made by Dalibor Farny http://www.daliborfarny.com
Original RFT Z568M tubes