Trialist strikers Gozie Ugwu and Sam Hoskins were on the mark in the game although Ugwu had to leave the field after just nine minutes.
New goalkeepers Ryan Clarke and Adam Smith had a half each while Ricky Holmes made his first appearance of pre-season.
Northampton move on to a fixture at Burgess Hill Town on Saturday afternoon with Chris Wilder pleased at his side's step up in preparations from the opening fixture at Sileby.