The Jennings Organ Company was founded in Dartford, Kent by Thomas Walter Jennings following the Second World War. Initially Jennings' main product was the Univox electronic keyboard. The company was renamed Jennings Musical Industries (JMI) in 1958 as they began to offer other musical equipment. 1958 saw the launch of the Vox AC15 amplifier followed in 1959 by the Vox AC30. In 1964, to raise capital for JMI's expansion, Tom Jennings sold his controlling interest to the Royston Group, a British holding company, and the American rights to the Thomas Organ Company.