> Ok, here we have finally gotten a documented number; 4 to
> 6 dB HIGHER
> with an untuned cathode driven amp than a tuned input. 6
> dB is a
> significant amount in my book.
I wouldn't take that number to the bank since the result
would have to depend heavily on the impedance seen at the
cathode, how the exciter behaves, and even cable lengths.
> Now it would be nice to see validation of these numbers on
> real amps
> that we find in use today.
It might be something that never happens because there are
too many variables.
> It is also very interesting reading in the last paragraph
> regarding the
> coax used to connect the exciter to the amp.
If it affects efficiency, and I know it does without a tuned
input or with an incorrect type of tuned input, it would
also have some effect on IM.
Quite frankly I've never measured the IM change because not
having a tuned input causes too many other headaches.
I highly doubt a simple shunt capacitor can be effective
from 1.8 to 30MHz.
73 Tom
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