Displeased with the direction his old company was taking, Tom Jennings left JMI in 1967, roughly the same time that Marshall overtook Vox as the dominant force in the British guitar amplifier market. He set up a new company, Jennings Electronic Industries (JEI), in his old Dartford location. Later, Dick Denney joined the new company which operated for several years, making an updated and rebadged version of the AC30, along with other amplifiers and a new range of organs. Jennings died in London in 1978 at the age of 60.