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Another way to do it is to pull the Horizontal output tube. That disables the HV. There are some drawbacks to that though...The set will not draw nearly as much B+ current so you won't get an accurate B+ current measurement for designing a replacement power supply. The other issue is that the AGC circuit (which is like an AVC circuit in a radio only more complex) in some TV sets relies on a pulse from a winding on the flyback which requires the HO tube to be in place....The worse case scenario for this is that the set may not receive any signals fed to it with the HO tube removed(no harm is done to the set though).
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