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That is a frustrating problem. Some possiblities: a bad connection with the pins-you could try heating them up and getting some extra solder down inside. I have pulled the socket loose on several tubes after nothing else worked but this is a major pain. And I have never had it work. But worth a shot if the tube is otherwise to be condemned. Could be a loose connection inside the tube. Tapping on the neck LIGHTLY with a screwdriver handle or some such will sometimes work. All 3 guns are connected to the same pins but often just one will be loose.
The worst case...and sadly most common...is that the tube has gone to air and the filaments are bad. This is not an easy tube to come by so I would give it ever shot.
And...these tubes won't get cataracts. They are made for use with a seperate, non-bonded, safety glass just like early bw picture tubes.
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Bryan
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