Sander deWaal wrote:

Chris Morriss said:

Yes there is NFB. Consider this: The grid of the triode is fed from a
non-zero source impedance. The signal at the anode is inverted. There
is capacitance between the anode and the grid.

OK?

So we have internal capacitive NFB, which rolls of the gain at high
frequencies. Typical, and expected triode behaviour.

So what would you call it?

Miller effect.

The electrostatic action in triodes acts at DC to HF.
The field effect of a voltage isn't frequency dependant.
capacitance and the field effcts in a triode are two separate identities.

Patrick Turner.



--
Sander de Waal
" SOA of a KT88? Sufficient. "