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Radio Record, Volume II, Issue 52, 12 July 1929, Page 29

OR short-wave work it often pays to experiment with the value of the grid condenser, as generally a very much smaller eqndenser can be used than when an ordinary- set is employed. ' WHERE binocular coils, astatie coils, ‘ or the so-called fieldless coils are used, the amount of screening required for B.F. stages is correspondingly reduced.