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The safest thing is to stick the end of the HV lead in an empty GLASS jar or bottle and tape the wire so that the lead stays in the jar. It is not a good idea to leave the lead hanging such that it can arc to the chassis and or YOU.
Also if the CRT heater is in series with another tube heater you will need to put an equivalent resistance in place of the CRT to get the other tube to light.
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