Total input capacitance is (assuming no cathode degeneration) Ctot = Cgk + ACgp, where A is the stage gain. The f3 would then be 1/2piZCtot, where Z is the source impedance of the driving stage.
If there's cathode degeneration, the Cgk term will be reduced, but for most triodes, the ACgp term dominates.
If there's cathode degeneration, the Cgk term will be reduced, but for most triodes, the ACgp term dominates.
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