 This relay can often be heard clicking off at the end of the degaussing cycle a few seconds after the monitor is turned on, and on and off during a manually initiated degaussing cycle.At high refresh rates and resolutions, the deflection coil/yoke starts to produce large amounts of heat, due to the need to quickly move the electron beam (because the electron beam has to scan more lines per second), which in turn requires large amounts of power, for quickly generating strong magnetic fields.This makes CRTs beyond certain resolutions and refresh rates impractical, since the coils would need active cooling, to prevent the heat from the coils from melting the glue that is used to attach them to the neck of the CRT.