Dave wrote:


What type of circuit: grounded grid or ground cathode?

It's class C with the filament grounded through a meter.

Leakage with the tube removed indicates inductive coupling between the
input circuit [grid] and the plate tank circuit.

I just tried it without the tube and it seems to have nothing to do with
the tube. When both input and output are resonant, 5 watts in gives me
5 watts out.

The input is a toroid under the chassis so it is not likely inductive
coupling. What I just found was that it goes away when I disconnect the
NC at the plate end.

What on earth does this mean?

js

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