A DIRTY lead-in is a graveyard for ~~ distant. signals. : AMPLIFICATION at low frequency means the magnification of: those eurrents which represent speech. or , musie, ie, the. magnification of the . optpet from the detector (whether ‘- epystal-or valve), gramophone records, ete, , ° . . * eae .
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https://paperspast.natlib.govt.nz/periodicals/RADREC19290208.2.37
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Radio Record, Volume II, Issue 30, 8 February 1929, Unnumbered Page
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40Untitled Radio Record, Volume II, Issue 30, 8 February 1929, Unnumbered Page
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