. The thermionic vacuum tube and its applications . Fig. 136.—General Electric TypePower Tube. Fu;. 137.—^\ Electric TjpePower Tube. Least ii: 30 cms. a C3dindrical anode by increasing its diameter causes an increasein the resistance of the tube. This is avoided in a type of tubeof General Electric design. The anode is shaped in the form ofa cylinder having four radial flanges^ which help to increase theradiating area. THE THERMIONIC AMPLIFIER 249 An obvious way of keeping]!; the temperature of the anode lowIS to increase its thermal emissivity b} blackening its surface.(Equation 23, Ch
. The thermionic vacuum tube and its applications . Fig. 136.—General Electric TypePower Tube. Fu;. 137.—^\ Electric TjpePower Tube. Least ii: 30 cms. a C3dindrical anode by increasing its diameter causes an increasein the resistance of the tube. This is avoided in a type of tubeof General Electric design. The anode is shaped in the form ofa cylinder having four radial flanges^ which help to increase theradiating area. THE THERMIONIC AMPLIFIER 249 An obvious way of keeping]!; the temperature of the anode lowIS to increase its thermal emissivity b} blackening its surface.(Equation 23, Chapter IV.) 78. Amplification Circuits. A great variety of circuit arrange-ments have been devised in which the thermionic tube can beoperated as an amplifier. We shall, however, discuss only a few
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