![]() ![]() ![]() The two images show eight Servikit types and three more. Known as theĬontinental Europe and Japanese types, which the range is designed The October 1964 issue of the magazine 'Wireless World' contains the following news article:Įnable any serviceman to repair virtually any entertainment type of transistor equipment. The RK is a CV-style date code for October 1960. The upper image shows Green Circle 6, probably an AF-output transistor. I'm curious as to what diode they supplied, as Newmarket did not make diodes. Yellow Circle : 8 transistors (and a diode).Green Circle : 7 transistors (and a diode).Blue Circle : 7 transistors (and a diode). ![]() White Circle : 6 transistors (and a diode).Red Circle : 5 transistors (and a diode).Five sets are offered in the advertisement: Newmarket may well have been the first UK company to offer sets of semiconductors like this, although Mullard, STC and Thorn-AEI did so later. They use a new identification scheme called 'Circle Line' based on a colour and a single digit number. On it, Newmarket announce several matched sets of transistors intended to provide the entire semiconductor complement needed by a transistor radio manufacturer. I am grateful to Paul, a correspondent who alerted me to this page from the magazine Wireless World in February 1959. Their logo seems to have changed a few times, possibly with the name changes, although they never printed a stylised logo on their transistors, the earliest types having no branding at all, and the later ones using the 'NKT' prefix. Intriguingly, they were true to their name and, to my knowledge, never made a single diode (although they sold one diode by shorting two leads on a transistor, see NKT155 below). Newmarket did not make any point-contact transistors, their first commercial products were junction types released in about 1956. I don't know if this is accurate, but there is now a website called 'Pye Story' that includes a history of Newmarket Transistors. In 1957 the company name was changed to 'The Newmarket Transistor Company' and in 1958, it was changed again to 'Newmarket Transistors Ltd'. It stated that originally 'The Transistor Development Company' was formed in December 1953 as a wholly owned subsidiary of Pye Ltd., to manufacture small signal low frequency germanium transistors for use in portable radios. There used to be a Web site that described the company history, but it has gone. Was one of the more idiosyncratic, and therefore interesting, small UK manufacturers of germanium transistors in the 1950's and 1960's. Newmarket Transistors Ltd., usually referred to as NKT, and located in the Suffolk town famous for its ![]()
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