 For many years they played amateur football until their election to the Football League in 1970.The early 1990s was Cambridge's most successful period; managed by John Beck the club won the first ever play-off final at Wembley Stadium and gained promotion from the Fourth Division before reaching two successive FA Cup quarter finals in 1990 and 1991 and winning the Third Division in 1991.The club reached the play-offs in 1992 but failed in their bid to become founder members of the Premier League.