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Check the contacts in the socket to make sure they are contacting the bulb's contacts. Is the fixture grounded? Some fluorescents like grounding. Outside of that, it has to be a bad ballast. It 'fires' the gases in the bulb which illuminate the phosphors. If the current supplied by the ballast isn't stable, it will burn bulbs prematurely.
Ian
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'87 Carrera Cab
----- “Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.” A. Einstein -----
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