>
>>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?
>
Grid driven 811As are formidable distortion engines.
>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.
Class AB is roughly ten times cleaner than Class B.
> Generally, class B is probably sufficient for SSB as
>long as you don't overdrive it very hard.
>
Not if you expect to avoid being tarred and feathered at the next DX
convention.
Rich...
R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
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