>Looking at my old Heathkit HA-10 Warrior I see that the designers set it up
>to be biased for Class B operation.
>
>What are the pros and cons of running class B vice g.g.??
Well, Lane, do you mean class B grid driven?
There are advantages to running grid driven vs. cathode driven (g.g.).
The grid driven configuration gives quite a bit more gain. Of course the
down side is that stability is harder to achieve and one has to have a
negative bias supply.
Class B operation as others have pointed out is when the tube only
conducts for 180 degrees of the input cycle (or half). The advantage to
class B vs. A is that it is far more efficient. The advantage over C is
that it is far more linear. The difference between class AB and B is not
all the different. AB produces a slightly cleaner signal at the expense
of less efficiency. Generally, class B is probably sufficient for SSB as
long as you don't overdrive it very hard.
73,
Jon
KE9NA
-------------------------------------
Jon Ogden
KE9NA
http://www.qsl.net/ke9na
"A life lived in fear is a life half lived."
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