[AMPS] Input Z

[measures]

>
>How do I determine / where can look up the input impedance for grid driven
>tetrodes?  I'm not satisfied with the input circuit I have in there now and
>want to give it another try.
>
In Class AB1,  input Z is essentially the reactance of the grid-C plus 
the grid-termination resistance.  The practical  choices of grid term. R 
are 12.5-ohms (4:1 bifilar transformer), 50-ohms (direct), 200-ohms (1:4 
bifilar transformer)  and 450-ohms (1:9 trifilar transformer).  

cheers, Bill

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