Jake Robinson made the most of his chance to impress, netting the only goal of the tie on 11 minutes.
3,444 watched an entertaining game at Sixfields as both sides created a host of chances but it is the Cobblers who make it into the next round of the competition.
Aidy Boothroyd told the official club website after the game that the performances of some of his fringe players such as Robinson had given him a welcome selection headache ahead of this weekend's return to league action.
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