Yeah, pretty much you have to try a different lamp, at least you have two setup so swapping is easy and you don't have to worry about begging/borrowing/buying for a new lamp only to find out it wasn't the lamp. However fwiw, double-ended lamps are pretty delicate, it's my guess that it is the lamp and not the ballast (this has happened with me a few times too - the lamp just craps out after a while). The ballast is probably cool simply because the lamp is not lit.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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