Especially at low plate voltage...
Contact potential between electrodes should be nothing else than the inducted charge on the electrodes by the boiling electrons form the heated cathode. This is possibly not to be confused with contact potential when dissimilar metals are between conductive paths.
Grid current especially at low plate potential should be nothing more that cathode electron emission current. Elscteins which have a negative charge find a path through grid or anode etc to return to their beloved protons which have positive charge. When such a path is made possible by an external resistance etc, grid or anode current etc flows. By electrostatic attraction.
This must be love.
See previous posts.
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