Re: Interesting Armstrong AM detector circuit.
I guess having an extra bit of gain would present a higher voltage-swing to the [semiconductor] diode - but to be honest the poor-linearity 'threshold knee' distortion effect in diode detectors is only ever a problem when you're feeding them with really low-level signals - tens/hundreds of millivolts, not the tens of volts which I'd expect a competent superhet receiver to provide!
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