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Friendly reminder that CRT TVs were basically a particule accelerator you had in your living room. They used power supple capable of delivering tens if not hundreds of thousands of volts, to accelerate the electron that were quite literally being boiled of a glowing piece of metal.
They sometime used a lead infused glass as the front plate to limite if not eliminate the small amount of X-ray they emitted towards you.
They had to be heavy because of the thickness of the glass needed to resist the distance of pressure between the atmosphere and extremely low vacuum inside the vacuum tube. It's that difference of pressure that would result in them exploding in a shower of glass shrapnell if the tube was broken.