Birmingham, UK-based company which is the manufacturer of the Mellotron. Les, Frank and Norm Bradley owned a company they named Bradmatics in the late 1950s; they did custom engineering and machining, particularly for UK-based tape recorder manufacturers. Bill Franson, a salesman for Chamberlin, visited Bradmatic in 1962 to inquire about getting tape heads manufactured for Chamberlin's instruments. Franson showed the Bradleys a Chamberlin Model 600 he had brought with him, and the Bradleys suggested ways in which the machine could be improved. Allegedly, Franson failed to tell the Bradleys that he was not the owner of the design. To get master tapes made for the instrument, the Bradleys reached an agreement with British bandleader Eric Robinson, who financed the recordings in exchange for holding the rights to same, as well as the Mellotron name. Robinson incorporated this as Mellotronics, Ltd.
Bradmatic built copies of the Model 600 and begin selling it as the Mellotron Mk. I, and shortly after, the Mk. II. When Harry Chamberlin found out what was happening, he threatened lawsuits, but the two companies settled their differences by 1966. Bradmatic changed its name to Streetly Electronics in 1966. Streetly introduced the M400, the most successful Mellotron model, in 1972; they ultimately sold over 1800 units. However, in 1976, Mellotronics fell into financial trouble and the rights to the name were acquired by Sound Sales, a company in the United States. Sound Sales denied Streetly permission to continue using the Mellotron name, so Streetly had to begin selling its machines under the "Novatron" name.
As the '80s rolled around, polyphonic synthesizers began cutting into Mellotron sales. By 1986, Streetly (and Sound Sales too) was out of business. However, in the 1990s, there was a revival of interest in the Mellotron. Les Bradley's son John Bradley, along with Martin Smith, reactivated Streetly. Their initial business consisted mainly of making parts for existing machines. But by 2007, they decided to offer a new model, the M4000. As of 2024, they offer this along with the Mark VII and the M4000D (a digital model that does not use tapes).