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1) SAFETY
The retained charge you are worried about is the high voltage - painful but not fatal. You can learn how to discharge the high voltage safely with the set turned off.
MUCH MORE DANGEROUS is the power line voltage. You need to find out if this set has a "hot chasssis" (connected to one side of the power line). Even if it isn't a hot chassis, powering through an isolation transformer is a good idea.
It's a big jump to work on a TV without having done something simpler like a radio, but it is doable with coaching.
Before starting, you need to obtain a schematic diagram and service information.
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Old TV literature, New York World's Fair, and other miscellany
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