Unknown 1

This is a nixie tube made by Rodan-Okaya of Japan. It displays two letters, ‘A’ and ‘R’. There is no model designation associated with this tube and it does not appear in any documentation that I have found.

The envelope is clearly the same as the GR-201, so it is reasonable to assume that it has similar electrical characteristics, given below:

Letter size 19mm
Min current 1.5mA
Max current 3.5mA

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