The thermionic vacuum tube and its applications (1920)
Van der Bijl, Hendrik Johannes, 1887- · New York McGraw-Hill Book, Co · leaf 128
asing voltages differ considerably from those obtained forincreasing voltages. On the infra-saturation part of the charac-teristic, however, the two curves coincide very well, showing thatthe amount of gas in the tube is not sufficient to cause any appre-ciable deviation for voltages lower than… … ,150 ZOO Anode Voiti Fig. 32. case where the tube is used as a telephone repeater. In order toinsure this the procedure commonly adopted in practice is toapply a potential for about a minute or so, to the plate, whichis higher than the normal operating voltages, and then test thetube to see if it…
Telegraph, Wireless
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