SHORT-WAVE SCREEN-GRID BOOSTER.
CONSTRUCTORS should note that the direction of turns should pe in the same direction on both the aerial and secondary coils. (Bnd of Constructiqn).
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https://paperspast.natlib.govt.nz/periodicals/RADREC19280706.2.49
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Radio Record, Volume I, Issue 51, 6 July 1928, Page 13
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27SHORT-WAVE SCREEN-GRID BOOSTER. Radio Record, Volume I, Issue 51, 6 July 1928, Page 13
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