The thermionic vacuum tube and its applications (1920)
Van der Bijl, Hendrik Johannes, 1887- · New York McGraw-Hill Book, Co · leaf 204
tube. When a tube is to beused as a voltage amplifier itshould therefore be designedto have as high a value of ^as possible. Fig. 89 shows aWestern Electric voltage am-plifier. The amplification con-stant Ai of this tube is 40. A voltage amplification ofseveral hundred fold is nothard to obtain, it… … 182 THERMIONIC VACUUM TUBE influence the voltage amplification. For example, it followsdirectly from equation (26) that the external impedance shouldbe made several times as large as the plate resistance of the tube.Now, for the same amount of filament surface the plate resistanceincreases…
Telegraph, Wireless
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