A Hint for the Crystal Set Owner
ONE or two of the makers of commercial sets employ the sliding contact on a plain solenoid type of coil for tuning purposes. One slide of the coil has been scraped, and a sliding arm is usually adjusted from the outside. After several months of use the exposed copper becomes coated over with a thin film of oxide and tuning becomes difficult, signals dying out, and the next moment coming back. Matters can generally be improved by rubbing this layer of bare wire over with fine sandpaper, and wiping over with a clean cloth. Also clean the underside of the sliding arm where eontact is made.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19290301.2.62.3
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Radio Record, Volume II, Issue 33, 1 March 1929, Page 27
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113A Hint for the Crystal Set Owner Radio Record, Volume II, Issue 33, 1 March 1929, Page 27
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