The thermionic vacuum tube and its applications (1920)
Van der Bijl, Hendrik Johannes, 1887- · New York McGraw-Hill Book, Co · leaf 285
and the point connectingthe plate, should become so large as to cause an undesirable wiifit«of a-c. power in the plate circuit of the tube. All the amplification circuits discussed thus far are unilateral;that is, they transmit and ampUfy currents in one direction only.For most purposes unilateral… … Fig. 147. be capable of transmitting and amplifying currents In both direc-tions, so that two-way conversations can be carried on over the line.The circuit that is commonly used in telephone practice, usingthermionic tubes as amphfiers, is shown m Fig. 148.^ It isknown as the 22-type circuit…
Telegraph, Wireless
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