. The thermionic vacuum tube and its applications . eans of a switch the current can also be transmitted directlyfrom the source to the receiver. When the attenuation of theartificial line is so adjusted that the intensity of the current inthe receiver is the same whether it passes directly to the receiveror through the tube and line to the receiver, then the current isattenuated by the line as much as it is amplified by the tube, andthe amplification can therefore be obtained from the known con-stants of the line. 216 THERMIONIC VACUUM TUBE The circuit arrangement used for testing audio frequ
. The thermionic vacuum tube and its applications . eans of a switch the current can also be transmitted directlyfrom the source to the receiver. When the attenuation of theartificial line is so adjusted that the intensity of the current inthe receiver is the same whether it passes directly to the receiveror through the tube and line to the receiver, then the current isattenuated by the line as much as it is amplified by the tube, andthe amplification can therefore be obtained from the known con-stants of the line. 216 THERMIONIC VACUUM TUBE The circuit arrangement used for testing audio frequencyamplifiers is shown in Fig. 111. f/ is a source of alternatingcurrent which will be described later. The current is prefeiablypassed through a wave filter to obtain a pure note of about 800cycles per second. By means of the switch W this current can betransmitted directly to the telephone receiver or be impressedon the input circuit of the tube. *S represents the artificial fineand takes the forai of a shunt to the receiver. It is, however, Fa.
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