My understanding is that Walter Schottky (of Schottky diode fame in his later life) invented the suppressor grid, making the pentode!
Quote:
Originally Posted by bigfathairyvika
My only idea is that a valve that is kinkless doesnt have a "kink" in its grid vs anode graph.
But I havent seen any valves so far that do have a kink!
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It's actually in its anode current vs anode voltage graph, grid voltage is not really relevant except to shift things up or down.
You probably haven't seen a valve with a kink because there weren't many types made! A kink in the characteristic is rarely desirable.
But, if you get a pentode with the suppressor brought out to its own pin c(eg EF80), and instead of connecting it to cathode like normal people do, connect it to anode or screen-grid so that it just becomes part of that electrode. You may well be able to demonstrate the tetrode kink then! If you do, let us know how you got on!