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#8
05-17-2011, 09:24 PM
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yes they do. it works EXACTLY like a CRT. if you look on the filaments of a nice fresh VFD, it has a "white" coating, thats the cathode coating that emits the electrons. the barium or whatever it is.
as the VFD wears, it turns darker and darker. When the VFD goes completely dim or dead, youll see the barium coated filament cathodes have almost no white left. 
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