The GR10K is a medium-sized nixie tube made by the English company ETL. It is unusual (though not for ETL!) in not having an anode grid. The anode is mainly at the back, extending a little up the sides. This causes problems with the display of digits the further they are from the back of the tube. For these photographs I used digits either side of the display digit as additional anodes. In addition, the stated cathode current of 1.4mA is way too small to get this tube to light evenly.

Digit size 19mm
Cathode current 1.4mA
GR10K datasheet

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