Yes, very good, but what if we replace the vacuum in the valve with a typical capacitor dialectric, maybe polystyrene or ceramic .....Then how can current flow in a vacuum tube?
Googling "does current flow through a capacitor ?" it's quite easy to find articles that say something along these lines
for a.c in a cap:
"A current will flow through the circuit, first in one direction, then in the other. However, no current actually flows through the capacitor. Electrons build up on the one plate and are drained off from the other plate in very rapid succession, giving the impression that the current flows through the insulator separating the plates.
Abbey I appreciate your technical knowledge is far greater than mine but can you please point me to a technical article to back up what you are saying.
Currently you're saying I'm wrong, I am keen to learn as much as the next person.