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The actual impedance is the result of the xfmr's primary inductance, parasitic capacitance, losses and the reflected impedance of the Miller capacitance.


Actually, the resulting input impedance is quite complex and can't be expressed with a single figure. It has peaks and dips. The art of the designer is to make sure that the impedance in the audio range is high enough, typically higher than 1k. The midrange peak can be higher than 10kohms.


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