@Pete - Does the phosphor show any signs of burning when the tube is off ? 

Maybe the static pattern of the clock-face is the problem.

I dont know much about phosphor degradation, but I cant help wondering if 
it's not 100% cumulative. For example, if one section of the tube is 
illuminated at 10% duty-cycle and another section at 100%, perhaps the 10% 
duty-cycle section might last *more* than 10X longer than the 100% due to 
heating or other effects.

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