The thermionic vacuum tube and its applications (1920)
Van der Bijl, Hendrik Johannes, 1887- · New York McGraw-Hill Book, Co · leaf 154
ary to heatthe filaments. The filament heating power is, however, small 1 Graetz, Die Elektrizitat und ihre Anwendungen, 15th Edition, p. 444. RECTIFICATION OF CURRENTS BY THERMIONIC VALVE 131 compared with the power that becomes available in the form ofunidirectional current. This is the more… … 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…
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