>Stupid Question (my personal specialty):
>If I'm running an AB1 class amp (e.g., 4CX1000A), it seems obvious that you
>don't *need* a tuned input stage with a minimum Q of 2 (to quote Eimac).
They recommend a bit higher Q, however, 2 will do.
>But...isn't the same true in the output?
- For one thing, to meet the fcc spurious emission spec. you need a
tank with a minimum Q of c. 10.
>I'm not sure you could wind a
>broadband transformer at those impedance/voltage levels, but even with the
>proverbial ol' pi-network it seems you should be able to get away with some
>pretty low Q's, and make your component life easier (at least to the extent
>that the output capacitance of the tube lets you).
>Or am I missing something obvious?
- The Z transformation ability of a tank is determined by it's Q. Not
enough Q means no tune. I would not try to go with a Q of less than 9
with a low RL tube (high I, low V).
- cheers, Scott
R. L. Measures, 805-386-3734, AG6K
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