Valves and Transformers
JN order to ensure maximum results with a modern L.F. transformer, the makers’ instructions concerning the valve impedances should be fol-¥ ' lowed very closely. Do not suppose that because the filament of a valve is not broken it must necessarily be capable of giving results, for this will not be the case if the valve has lost emission.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19300124.2.6
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Radio Record, Volume III, Issue 28, 24 January 1930, Page 4
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61Valves and Transformers Radio Record, Volume III, Issue 28, 24 January 1930, Page 4
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