As with possibly many things in life there are only a handful of persons on the planet who know.
On the subject of electron tubes one of the very few who understood how they operate is the inventor of FM radio, Edwin Armstrong. Particularly on the matter of inserting an unconnected grid between cathode and anode and observing anode current to dramatically decrease. [Armstrong]
So this is possibly the best ever paper written on our planet on how electron tubes operate:
In older times the amplifying electron tube was called Audion, invented by Lee De Forest.
Reference:
Operating Features of the Audion - E. H. Armstrong
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