The thermionic vacuum tube and its applications (1920)
Van der Bijl, Hendrik Johannes, 1887- · New York McGraw-Hill Book, Co · leaf 230
ving the Ivirchofif equations for thenetwork. THE THERMIONIC AMPLIFIER 207 Unless the frequency is very high (over a million cycles persecond) we can neglect the capacity C2 between filament andplate, since it is shunted by the plate resistance which is thenlow compared with the impedance due to… … For most tubes used at present this equation is applicable forfrequencies up to about a million cycles per second. Let the external output impedance take the general formZQ=rQ-\-jxQ. Then equation (51) can be transformed into: „ _ ac-\-bd.ad—bc r52) (53) c2 + d2 = -rs+jXi;where the coeflEicients…
Telegraph, Wireless
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