. The thermionic vacuum tube and its applications . / / / True Voltage Fig. 221. 2,4- circuit is reduced to zero. Since the current through the tube isgiven by I = f{Ep+), it follows that the voltage to be measured is txEg when the currentis just reduced to zero. By using a tube which has a large value of MISCELLANEOUS APPLICATIONS OF THERMIONIC TUBES 371 fi the necessary grid battery voltage need not be large. Thus, ifn = 1000, a grid battery of 50 volts is sufficient to measure 50,000volts. Such a tube should be designed with long side tubes asshown in Fig. 222, to pr
. The thermionic vacuum tube and its applications . / / / True Voltage Fig. 221. 2,4- circuit is reduced to zero. Since the current through the tube isgiven by I = f{Ep+), it follows that the voltage to be measured is txEg when the currentis just reduced to zero. By using a tube which has a large value of MISCELLANEOUS APPLICATIONS OF THERMIONIC TUBES 371 fi the necessary grid battery voltage need not be large. Thus, ifn = 1000, a grid battery of 50 volts is sufficient to measure 50,000volts. Such a tube should be designed with long side tubes asshown in Fig. 222, to prevent arcing across the 116. The Audion Voltage and Current Regulator. The follow-ing circuit arrangements, for which I am indebted to Dr. P. , indicate how the tube can be used to control the output of agenerator or other source. The generator S supplies power to
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