Autogated power supplies send a positive or negative voltage to the MCP input, thereby attracting or repelling electrons produced by the photocathode. This basically cycles the flow of electrons produced by the photocathode on or off from entering the MCP. The attracting and repelling of those electrons causes the electrostatic field of the photocathode and MCP to repel or attract each other making the MCP flex back and forth which results in the whining noise heard.
The advantage of an Autogated tube is that it improves the quality of the image. This is best seen when looking at objects that have a light source behind them. Automating helps cut down on the glare you would see in non Autogated tubes. The reduced glare enables you to see more detail about the object in front of the light source.
Turning on an Autogated tube during day time ambient light levels can damage the tube’s photocathode and or screen.
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