 After the outbreak of war , both ships were fitted with a degaussing coil to protect them against magnetic mines . Leipzig had her aircraft equipment removed in 1941 , along with her after torpedo tubes . In 1942 , Nürnberg 's aircraft handling equipment and aft torpedo tubes were also removed . Throughout the war , the ships ' radar suites were upgraded ; in March 1941 , Nürnberg was equipped with FuMO 21 radar and in early 1942 , a FuMO 25 radar set was installed . The latter was a search radar for surface targets and low @-@ flying aircraft at low range . The FuMO 21 set was replaced by the short @-@ range FuMO 63 Hohentwiel 50 @-@ centimeter radar . Nürnberg was also fitted with four Metox radar warning receivers . Leipzig did not receive her FuMO 24 / 25 radar set until 1943 ; this was to be the last modification for Leipzig . 
