9) What is Holdover?

When a discharge tube is used on a circuit that has a DC voltage component, there is a phenomenon occurs, called holdover, where the discharge in the tube continues being driven by the current from the power supply even after the surge voltage has subsided.
When a holdover occurs, for example when it is occurs in the drive circuit of a CRT, the screen darkens and discharge in the absorber continues, which can lead to the glass tube melting, smoking or burning.





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