Annaka Denki G.K. (G.K = Goshi Kaisha = Limited Partnership Company)

39 Fujima-Cho, Azabu-Ku, Tokyo, Japan

Later moved to 1800 Onna, Atsugi-Shi, Kanagawa. (date not known) 

Annaka Denki G. K. was established in 1900 mainly for manufacturing and repairing military wireless telecommunications equipment. This was mainly induction coils, spark transmitters, detectors, storage batteries and capacitors. In 1903 the company exhibited a wireless transmitter and a 30 cm fireworks coil at the 5th Japan Industry Promotion exhibition. In 1912 Annaka succeeded in producing the TYK wireless telephone and in 1916 began telegraph service between Toba, Toshijima and Kamijima in Mei Prefecture, using the TYK wireless phone service. In 1924/25 Japan's first radio service was started at Tokyo Radio Station (later renamed NHK). The company began developing transmission technology around 1925 and by 1928 released a 2kW wireless transmitter for ocean going shipping. These were used on ships sailing to Europe and the U.S. The "Amara Maru" was one of the first installations.

Radio became Annaka's major market in the 1920's. They had been manufacturing radio parts' including tubes, as early as 1917 (AAB5, AAB7 and other double ended triodes etc). They also made receivers, headphones and loud speakers. One crystal set located has a most unusual design. There was also a type 258 tube (possibly equivalent to a UV201A) made about 1924 but shortly after this, tube production ceased. It is believed that the reason for this part of the business ending was due to patent infringement. In 1931 the company merged with Koritsu Denki to form Anritsu Denki (Anritsu Electric Corporation). For further history, see Anritsu