Rich said:
>Higher series R means lower parallel-equivalent R - and that means
lower gain.<
Not so. The gain is determined by the total anode load impedance, not just the
resistance in the network. A given length of resistance wire in a coil has a
certain reactance and a certain resistance, when measured as series components.
As frequency goes up, so does the total impedance when considered as series
components, and so does the total impedance when considered as parallel
components - at the same frequency.
An inductor in shunt with a resistor in parallel shows an impedance change as
frequency goes up that is asymptotic to the impedance of the resistor. That
says the network impedance has a maximum value, and thus the amplifier gain has
a maximum value.
73
Peter G3RZP
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