The thermionic vacuum tube and its applications (1920)
Van der Bijl, Hendrik Johannes, 1887- · New York McGraw-Hill Book, Co · leaf 248
aracteristic (see Fig. 18, page 51). The effectof filament temperature is indicated in Fig. 117, which gives therelation between the filament voltage and the amphfication meas-ured at a constant plate voltage in a circuit like that shown inFig. HI. For this particular type of tube, it is seen from… … FiG. 116. tory operation and long Hfe can therefore be obtained by suitablyadjusting the filament current. Referring to equation (36) it is evident that the amplification increases as the ratio — is increased provided the plate resistance Tp always remains equal to the external impedance of the…
Telegraph, Wireless
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