The thermionic vacuum tube and its applications (1920)
Van der Bijl, Hendrik Johannes, 1887- · New York McGraw-Hill Book, Co · leaf 265
eratingfilament current is 1.1 amperes and the filament voltage o.G volts.The amphfication produced by the tube is equivalent to about20 miles of standard cable. Tubes that are used as amplifiers and radio detectors and in- 242 THERMIONIC VACUUM TUBE tended to deliver power directly to a telephone… … 20 30 40 Anode Volts Fig. 129. dissipate more than a fraction of a watt in heating the filament.The desirabihty of reducing the power necessary for heating thefilament is apparent. A tube in which this has been done is shownin Fig. 131. The filament is of the oxide-coated type, 2X10~^inch in…
Telegraph, Wireless
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