Re: What is meant by "kinkless"?
That's what I understand too. If you plot the Ia (Anode current) against Va (Anode voltage) curver for a normal tetrode, there is a region (due to secondary emission of electrons from the anode being collected on the screen grid) where the anode current decreases as the anode voltage increases -- a negative resistance region. It's possible to use that effect to make an oscillator. There is thus a noticeable kink in that graph
The kinkless tetrode/beam tetrode (and indeed the pentode) do not have this negative resistance 'kink'
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