His official website said Lomax died Sunday in the Wirral, near Liverpool, following a brief illness.
Website manager Alistair Hepburn said Lomax's family told him of the death. The family also released a statement to The Beatles Shop in Liverpool Lomax was signed to the Beatles' Apple label in the 1960s.
He had known the band members since their early days at Liverpool's Cavern Club. He lived for many years in Ojai, California, but recently had returned to England.
His website says he recently finished an album that will be released within months. Hepburn said a funeral will be held today.