Testing Headphones
THE best method of ascertaining if _a pair of headphones is in good condition is to disconnect them, put the ’phones on, and place the end of one of the leads between the teeth. Rub a key or nail upon the other lead and the weak currents set up in them will cause a scraping sound in the earpieces which will correspond with the rubbing of the key. If the sound is very weak in one earpiece and not in the ather, you will have ascertained. zhich. is wrong, and if both give distinct and clear scraping noises you will know that the ’phones are very sensitive, for no ordinary battery is being used for the test, and. only a sensitive instrument will give results.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19300103.2.58
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Radio Record, Volume III, Issue 25, 3 January 1930, Page 30
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127Testing Headphones Radio Record, Volume III, Issue 25, 3 January 1930, Page 30
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