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CCS and common cathode

Hey-Hey!!!,
I have seen this arguement, re. the cathode resistance increasing output z. for a resistor it is a closed form sol'n. If the CCS is near infinite z then output z would also be ridiculous. This is not the case. I suspect that the contribution to the output z is mostly the input z of the other cathode. WHich would yeild an output z for the circuit much more in line with what would be measured. As far as measurements go, the freuency rsponse of one of these driving another triode( read: Miller ), the output z is in line with a single grounded cathode with small unbypassed resistance.
regards,
Douglas


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