Are you referring to the linear IN-9 tube ? I experimented with a few of 
those and was very disappointed with their erratic behavior. For example, I 
could get half of the tube to illuminate with 5-6mA. When I disconnected & 
reconnected it, the reading was different. If I left it on for awhile, with 
the same current, it would drift. The deal-breaker for me was when I would 
crank the current up-and-down, and sometimes it would start glowing from 
the opposite end.

I sure hope these weren't used in critical applications, such as monitoring 
a nuclear reactor.....

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