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RE: You're right, I'm wrong.

Yes if you want the 1K ohm source to see the same percentage of the midband load at the lower frequencies.

With a 10k load in parallel with the reactance of a plate choke with 80Hy (10k ohms at 20Hz) the tube sees a load of 5k ohms at 20Hz.

The reactance of 80Hy at 1kHz is 500,000ohms. 10k //500k = 9800 ohms

5k ohms is 51% of 9800 ohms.

If we use that same choke for a 100k ohm load the 1kHz load for the tube is 83.333k ohms but the 20Hz load for the tube is 9090 ohms, only 10.9% of 83.333K ohms.

When we have a 100k ohm load, for the 20Hz load impedance presented to the tube to be the same percentage of the midband load impedance, 51%, then we would need there to be 800Hy of inductance in the plate choke.


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