GTV9 was amongst the first television stations to begin regular transmission in Australia. Test transmissions began on 27 September 1956, introduced by former 3DB announcer Geoff Corke, based at the Mt. Dandenong transmitter, as the studios in Richmond were not yet ready. The station was officially opened on 19 January 1957. The Richmond building, bearing the name Television City, had been converted from a Heinz tinned food factory, also occupied in the past by the Wertheim Piano Company (from 1908–1935). In 1957, GTV9's first large-scale production was the nightly variety show In Melbourne Tonight "IMT", hosted by Graham Kennedy, a radio announcer at 3UZ in Melbourne, before being 'discovered' by GTV9 producer Norm Spencer.