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This could have been used in a city where there was perhaps one government owned TV station. The selectivity would be in the antenna coil tuned for the one station. If you had say 500 kw of visual power from the transmitter, and were a few miles away, I'm sure you could get an O.K. signal with this little amplification. It could be perhaps an anode detector like is used in old TRF radio sets...no seperate diode is needed.
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