Some possibly demented thoughts......
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In (nearly) all cases, if the frequency of operation, and impedances at both sides of the matching network are known, the needed component values in the network can be calculated
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In a tube amp, the input impedance, and the output impedance are fairly constant despite changes in frequency, so the only thing that needs to be taken into account when designing the network...is the frequency....and those "make sense" as far as less capacitance or inductance is needed as the frequency goes up.
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With an antenna tuner, the impedance at one end is usually 50 ohms with no reactance while the other end of the antenna tuning tuner is presented with a wildly varying impedance, so the component values in the tuner need to take into account the both the impedances as well as the frequency.?
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Eric
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