The thermionic vacuum tube and its applications (1920)
Van der Bijl, Hendrik Johannes, 1887- · New York McGraw-Hill Book, Co · leaf 154
Fig. 54. table on p. 77 it is seen that if the filament is of tungsten and isoperated at a temperature a little under 2500° K. the thermionicefficiency is 10 m.a. per watt. Since the necessary saturation cur-rent /i is 300 m.a. the power necessary for heating the filament ofthe valve under… … Fig. .5.5. from equation (15). Putting /2 = 0, the heating equivalent of thecurrent in the load resistance is g -^ and the available power in the form of unidirectional current is g^ -^. Assuming that the current-voltage characteristic of the circuit is, in view of thehigh load resistance of about…
Telegraph, Wireless
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