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Oops! I need a refresher course on tube physics.

You are right. Secondary emission is indeed about electrons bouncing off the plate, but this is seen only as a problem in old tetrodes where the kinks appear. The tetrodes have that extra positive charged electrode that over-accelerates the electrons to the plate at certain portions of its plate curves. The pentode's extra grid suppresses that.

But there is internal NFB inside a triode becasue I've read that repeatedly. This is why its plate curves go vertical instead of horizontal like a pentode's. I am at this point unsure of how the NFB occurs inside a triode if it's not "secondary emission". It's something, though. Maybe someone can explain it. The elementary physics here is not my strength.

Kurt

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