The LC-631 is a medium/large nixie tube made by Unitra-Dolam of Poland. It is pin-compatible with other medium/large tubes such as the ZM1042 and the Z5660M.

Digit size 31mm
Min current 3mA
Max current 6mA
Base B13B

The tube comes in at least two variations. One has a prominent getter at the top and so is also slightly taller. You can see side-by-side comparisons in the first four photographs below.


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