This circuit should help the correspondent who is experiencing selectivity trouble.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19300822.2.39.2
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Radio Record, Volume IV, Issue 6, 22 August 1930, Page 24
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11This circuit should help the correspondent who is experiencing selectivity trouble. Radio Record, Volume IV, Issue 6, 22 August 1930, Page 24
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