Useful Hints
NEVER. drop telephones on to the floor or throw, them on to a chair, as apart from the permanent magnets in them being weakened by sudden shocks the diaphragms are easily bent. VERY often a slight roughness in reproduction can be cured by the simple expedient of connecting a grid leak across the secondary terminal of the audio transformer.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19310116.2.65
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Radio Record, Volume IV, Issue 27, 16 January 1931, Page 29
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61Useful Hints Radio Record, Volume IV, Issue 27, 16 January 1931, Page 29
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