O not attempt to use an H.T. supply unit unless this has been properly constructed on n "safety first" principles. FAULTY switches in the house wiring often give rise’ to loud clicks and roars on the loudspeaker, which disappear when the switch contact is attended to by an electrician.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19291115.2.62
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Radio Record, Volume III, Issue 18, 15 November 1929, Page 29
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49Untitled Radio Record, Volume III, Issue 18, 15 November 1929, Page 29
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