| A vacuum tube amplifier circuit consists of a triode, load resister, batteries, and variable voltage source. The triode is an evacuated glass tube that consists of a cathode C, anode A, and grid G. Battery A heats the filament in the cathode so that electrons are free to move. Battery B maintains a potential difference between the cathode and anode and supplies the energy that the electrons gain when they flow from the cathode to the anode. This flow can be controlled by applying a negative voltage to the grid with Battery C. The higher the negative voltage on the grid, the fewer electrons flow from the cathode to the anode. Small changes in grid voltage from a radio or audio signal S can produce large variations in current flow from cathode to anode and throughout the rest of the circuit. |
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