Re: An interesting thermionic device.
I'm wondering about the magnetic metal bit - and pondering if it could be some sort of TR-switch for inserting in a waveguide?
(these were designed to ionise very quickly when subjected to a pulse of microwave energy, so providing a short-circuit - often in conjunction with a 1/4-wave of waveguide - across the receiver input to prevent the receiver being desensitized).
If it is a TR-switch imay not have contained a vacuum; TR-switches often used Helium or sometimes even water-vapour.
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