To discharge a CRT you will need two long metal shaft screwdrivers.
Look at the back of the CRT, you’ll see something that looks like a suction cup. Slip one of the screwdrivers under that cap, it will hit the metal prongs in the cap. Use the other screwdriver to touch a piece of metal somewhere in the set, then touch the two shafts together. You’ll get a quick arc if the tube was charged. Rub the drivers together and under the cap/on the metal to make sure you have a good connection.
Once discharged, you can gently pop the cap off the tube. Generally, any metal chunk it touches will discharge and keep it from accumulating a static charge. Be gentle, the risk of implosion is negligible around the cap area, but can still happen.
Don’t do this if you’re unsure of anything.
That's how I started doing it before I got myself a big ol' long high voltage probe. Has a neat little electrode attachment that slides under the cup. Makes awesome noises when actually measuring the anode.
Yeah, the proper tool is always better. I never had the need for a HV probe - only did TV repair when I was in high school, after that I entered a different area of electronics.
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