[TE you are using a B eliminator and are troubled with a slight hum, it is a good plan to insert the primary or secondary of an old audio transfor mer in series with the B-++ to the detector lead, as this very frequently effects 4 complete cure. i rr
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https://paperspast.natlib.govt.nz/periodicals/RADREC19290906.2.81
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Radio Record, Volume III, Issue 8, 6 September 1929, Page 31
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50Untitled Radio Record, Volume III, Issue 8, 6 September 1929, Page 31
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