The thermionic vacuum tube and its applications (1920)
Van der Bijl, Hendrik Johannes, 1887- · New York McGraw-Hill Book, Co · leaf 243
5, rp = 5XlO^ ohms, rs = 6XlO ohms, and the imped-ance Zo was assumed to have an angle of 45°. The lower curvegives the amplification expressed in ratio of output to input power,while the upper curve gives the power amplification expressed inmiles of standard No. 19 gauge cable. It is seen that… … Fig. 112. expressed on the logarithmic scale, is quite small. A changein amplification of one standard cable mile is not serious. Theexternal impedance mto which the tube works can therefore havevalues ranging from about one-half to two and one-half times theplate resistance without producing any…
Telegraph, Wireless
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