What's Wrong?
A Common Fault. Jt sometimes happens that when the volume control knob is rotated, a grating or clicking noise is heard in the speaker. This is due either to dust which has collected on the resistance element, causing poor contact, or to a loose slider. In some cases a clean-up with a strip of cardboard rotated under the slider as shown will cure the trouble. In others it is generally necessary only to tighten the spring contact a little to remove the fault.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19330630.2.51
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Radio Record, Volume VI, Issue 51, 30 June 1933, Page 27
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85What's Wrong? Radio Record, Volume VI, Issue 51, 30 June 1933, Page 27
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