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Of any of the CRTs-Picture Tubes- has an area in the middle of the screen that it looks like all the phosphorous has been wiped off, its JUNK. That means the tube has lost its vacuum, & is sorta like the Dead Parrot in the old Monty Python days-THAT Parrot wouldn't "Voom" if you ran a jillion volts thru it. It is a DEAD Parrot.
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Benevolent Despot
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