. The thermionic vacuum tube and its applications . 1 rrrrm J Fig. 111. not a simple shunt, but is so designed that the total impedance tothe output current is always constant for all values of the branchcurrent in the receiver. This is done, as will be explained below,by the addition of the series resistance r\. In this form theshunt is known as a receiver shunt. The direct current in theplate cucuit is suppHed through the choke coil, as shown, toinsure that the plate resistance remains constant. Although thetotal output impedance remains constant for all adjustments of theshunt the resistanc
. The thermionic vacuum tube and its applications . 1 rrrrm J Fig. 111. not a simple shunt, but is so designed that the total impedance tothe output current is always constant for all values of the branchcurrent in the receiver. This is done, as will be explained below,by the addition of the series resistance r\. In this form theshunt is known as a receiver shunt. The direct current in theplate cucuit is suppHed through the choke coil, as shown, toinsure that the plate resistance remains constant. Although thetotal output impedance remains constant for all adjustments of theshunt the resistance does not. Hence, if the choke coil wereomitted the potential difference between filament and plate wouldchange with the shunt adjustment and this would result in a change THE THERMIONIC AMPLIFIER 217 in the plate resistance. The seeondarj of transformer T2 is woundto have as high an impedance as possible, so as to impress thehighest possible voltage between the grid and filament. Thegrid battery Eg is inserted to keep the grid sufficiently negat
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