What is the mechanism by which Triodes in audio tube amps generate harmonic distortion?
It is my understanding that the distortion is generated by means of electron bunching. That is, when the grid voltage swings negative and is larger than the cathode voltage, it blocks off electron flow from the cathode to the anode plate and creates a cloud of electrons with non-uniform density. When the negative grid voltage falls to 0, this cloud of electrons moves forward to the anode in the form of a bunched wave which adds harmonics to the signal. Or when there is a capacitor connected to the anode lead by means of a T-junction that can cause the anode voltage to swing negative, repelling the oncoming free electrons emitted by the cathode and creating a "space charge" between the anode and the grid with nonuniform density due to velocity modulation. Is this correct? If not please explain why.