Thanks,
Jason
Just for some background, the outlet is a double 3-prong outlet with a light switch in the same box (switch doesn't control outlets, though). The cord unplugged was the only cord to the outlet, and went to the Christmas tree, which has 4 100 light strands on it (light instructions said strand of up to 4 was OK). The outlet is about 10 years old, the wiring is most likely 71 years old.