My guess is that you'd run it like a standard CRT.
Take a look at any of the smaller B&W TV type specs, and/or the small standard CRTs.
Then fire it up with a variable HV supply, a little cathode resistance to make sure that the max current is not exceeded, use middle of the road voltage for the screen grid, and of course the grid grid will control intensity...
Would love to have a box of them!!
they'd make super cool "indicators" - they could even be used as a peak tuning indicator, etc... power, high voltage...
_-_-
Patrick's reply OPCOM seems pretty close. They are not actual CRT's but part of JUMBO screen and are lit up by a command from a computer. 3 of them in a matrix, like it is in an LCD or LED display...and our faithful CRT friends. Red Green Blue in a triangle.