The thermionic vacuum tube and its applications (1920)
Van der Bijl, Hendrik Johannes, 1887- · New York McGraw-Hill Book, Co · leaf 347
High FrequencyChoke … Fig. 193. frequency currents in the output coils, therefore, flow in oppositedirections and the output in the secondary of the transformer Tois zero. But if the audio frequency voltage is impressed as indi-cated at L. F., the grid of the one tube becomes positive whenthe other becomes negative so…
Telegraph, Wireless
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
