Variation in the grid voltage will cause identical proportional variations in the plate current.
2.
The plate current is progressively reduced as the grid is made more negative with respect to the cathode.
3.
This effect occurred especially in pulse and digital circuits, where tubes had no plate current flowing for extended times.
4.
Changing the grid voltage will change the plate current; by suitable choice of a plate load resistor, amplification is obtained.
5.
A positive voltage on the grid will attract more electrons from the cathode, so more reach the plate, increasing the plate current.
6.
A more negative voltage on the grid will repel some of the electrons, so fewer get through to the plate, reducing the plate current.
7.
Therefore, a low power varying ( AC ) signal applied to the grid can control a much more powerful plate current, resulting in amplification.
8.
The plate current was routed through that portion of the rectifier heater, in order to make up for the current diverted to the dial lamp.
9.
Plotting plate current as a function of applied grid voltage, it was seen that there was a range of grid voltages for which the transfer characteristics were approximately linear.
10.
The main problem with these designs is constructing output transformers able to sustain the plate current and resultant flux density without core saturation over the full audio-frequency spectrum.
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