Blue glow... outer 2 tubes

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Devon8822

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Jan 12, 2007
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The outer 2 tubes in my Mark IV are glowing blue in the middle, what does this mean?
 
Watching the colour move with the introduction of a magnet is basically how the "old" CRO TV's worked - only no phosphorous screen. Well at least I guess they're "old" now, what with all this LCD and Plasma mumbo jumbo...
 

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