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Do you know what CRT that is?
CRTs of that vintage and size often were tubes made with a metal cone between the glass screen and the glass neck section. There were mechanical problems making a CRT that was all glass that were later solved. The metal/glass tubes were lighter as an advantage at least.
The all glass tubes have a conductive coating (DAG) on the inside that is connected to the HV lead. (Later they applied a conductive coating also to the outside that was grounded. This formed a capacitor that helped smooth the HV charge.)
On a metal/glass tube the metal cone was used as the HV electrode. There is a HV cap (ceramic almost always) in the chassis that smooths the HV charge. The tube shell must be insulated from the chassis and other metal areas. The insulation can also form a capacitor that can hold a charge. It is always a good idea to discharge anything that is or was connected to the HV lead. So that means the metal cone as well as the HV cap in the chassis.
You will want to clean the insulation sheet and other parts but be careful not to damage them.
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