The '4' in the unit-hours position I saw in the video should not have been 
poisoned during normal operation, because all 10 cathodes will get 
Could this tube have been in a different position, such as the 'tens 
hours', and been poisoned that way ?

What I'm wondering is if this is normal 'wear-and-tear' , or a small leak, 
rather than classic cathode poisoning (contamination of a seldom/never-used 
cathode from other cathodes that are used).

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