 GTS/BKN began transmissions as a solus commercial television service by Spencer Gulf Telecasters in the upper Spencer Gulf in 1968, with Port Lincoln and Broken Hill commencing in 1970 and 1974 respectively.On 13 May 1989, TNT-9 was sold by ENT Ltd. to Southern Cross Broadcasting and was integrated into the Southern Cross network.Tasmania was aggregated on 30 April 1994, albeit with only two stations – Southern Cross became a dual Seven and Ten affiliate, while TAS TV took programming from the Nine Network.