Useful Tips
\pery turns of fine wire wound on a. 2-inch cardboard tube makes quite a useful radio frequency choke for short-wave work. ‘A LoHOUGH other valves are occasionally to blame, it. is generally the last or output valye that: causes distortion.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19310313.2.65
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Radio Record, Volume IV, Issue 35, 13 March 1931, Page 31
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42Useful Tips Radio Record, Volume IV, Issue 35, 13 March 1931, Page 31
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