[1] The station was originally owned by Druleigh Business and Technical College Pty Ltd,[2] hence the callsign DB.

The station was also a big producer of radio drama (including soap operas), live variety programs, quizzes, etc.

3DB also transmitted many sporting events, particularly horse racing, VFL football, and test cricket from England.

J Albert & Son, a Sydney based music company and owners of 2UW, purchased 3DB in late 1987 and changed the call sign to 3TT.

The last program to be broadcast under the 3DB call sign, in the very early hours of 2 April 1988, was a repeat of Bert Newton's 1987 documentary on the 60th anniversary of 3DB.

[8] Lawrence Costin who had been on the 3DB announcing staff for over 30 years was the only 3DB on-air personality to be retained by 3TT; as a newsreader and reporter.

[11] 3DB/3TT's old AM frequency of 1026 AM was returned to the government, and from 1991, it was used by the ABC for 3PB, which broadcast intermittently with live coverage of federal parliament.

The Fraser government was not prepared to allocate FM licences to all AM stations, which is what the industry wanted, and what had occurred in many overseas countries.

In November 2014, the Australian Radio Network announced that Mix 101.1 would rebrand to KIIS 101.1 on 19 January 2015 with a new breakfast and drive show.

[17] In October 2017, ARN announced that Matt Tilley, Meshel Laurie, Dave Hughes and Kate Langbroek would leave the station at the end of the year.

Hughesy & Kate moved to Southern Cross Austereo's Hit Network to replace Hamish & Andy.

[19] In November 2023, after months of media speculation, it was announced that The Kyle and Jackie O Show would be networked from KIIS 106.5 Sydney in 2024 effectively ending Jase & Lauren.

In March 2024, ARN announced changes to its daytime programming with Gordie Waters being networked from Sydney into Melbourne and KIIS 97.3 in Brisbane from April.

[23] When 3DB became 3TT the station continued to broadcast from 61 Flinders Lane, but within a short time, in December 1988, 3TT moved to new studios in Queensbridge Street, South Melbourne.