>
>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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