[Amps] *** SPAM *** Re: Suppressors
Peter Chadwick
g3rzp at g3rzp.wanadoo.co.uk
Wed Aug 30 12:17:36 EDT 2006
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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