So effective is the potentiometer control of grid bias in the detector of a short-wave set that it is now usually regarded as a necessary modification of such a. cireuit.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19310130.2.46
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Radio Record, Volume IV, Issue 29, 30 January 1931, Page 15
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30Untitled Radio Record, Volume IV, Issue 29, 30 January 1931, Page 15
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