A HUM from a mains unit which is being used to supply H.T. to the set can very often be reduced if the value of the detector grid leak is lowered.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19290328.2.10
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Radio Record, Volume II, Issue 37, 28 March 1929, Page 5
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31Untitled Radio Record, Volume II, Issue 37, 28 March 1929, Page 5
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