To guess the hours on the tubes, take the lenses off. The blue wears first, then the green then the red. Usually blue wear shows up after about 3-4k hrs of use. It will apear as a retangular ghost in the CRT's surface. Burn is when a logo or barchart is actually visible in the CRT's surface. It was actually burned into the phospor surface. As the blue becomes worn, the color balance is usually more difficult to achieve. hope this helps...Steve.
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