Odds are it's a probe start ballast for the MH. Without an ANSI # the easiest way to tell is count the # of parts. A probe start ballast is transformer and capacitor ("cap-n-coil"), a pulse start ballast is transformer, capacitor and ignitor (looks a little like a capacitor, but likely smaller and slightly different).
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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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