‘THE object of ary radio frequency amplifying stage is to magnify the weak long-distance signals before they reach the detector, thus adding to the range and sensitivity of the receiver.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19291018.2.10
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Radio Record, Volume III, Issue 14, 18 October 1929, Page 4
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30Untitled Radio Record, Volume III, Issue 14, 18 October 1929, Page 4
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