The thermionic vacuum tube and its applications (1920)
Van der Bijl, Hendrik Johannes, 1887- · New York McGraw-Hill Book, Co · leaf 208
e whenusing transformers we have to consider the power, and maximumamplification is obtained when Zo—Tp, T2 being used as a voltagestep-up transformer. This can be shown as follows: The power THE THERMIONIC AMPLIFIER 185 in Zo will be a maxirnmn for maximum voltage eg impressedon the input of the… … Fig. 92. It is in all cases desiral)le to make Zi as large as can possiblybe done in practice. Hence, regarding Z\ as fixed and differen-tiating eg with respect to Zq and equating to zero, it will beseen that eg is a maximum when Zo=rp, and this, it will be shownin the next paragraph, is the…
Telegraph, Wireless
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