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A klystron works because of resonant cavities. A diode has none. Both exhibit the interaction between charges and em waves, one uses it to provide amplification and its design enhances this interaction, the other does not make a point of it. Do you not realise that electrical energy from the power supply (a flow of energy via an electric field) causes the acceleration of an electron. When it slams into the other end, the ke is transfered, via an elecromagnetic interaction as it collides with atoms, to internal energy.
I don't have time to talk about nonsense.