Koyo Electronics (Kōyō Denki) and its subsidiary Koyo Electronics Industry (Kōyō Denshi Kōgyō), often collectively referred to as just Koyo, are Japanese electronics companies based in

Kodaira, Tokyo is a Cities of Japan, city located in the western Tokyo, western portion of the Tokyo Metropolis, Japan. , the city had an estimated population of 195,207 in 93,654 households, and a population density of 9500 persons per km2. The total area of ...

that manufactured radios from 1955 until 1973, and now its subsidiary manufactures industrial electronics devices and

factory automation Automation describes a wide range of technologies that reduce human intervention in processes, mainly by predetermining decision criteria, subprocess relationships, and related actions, as well as embodying those predeterminations in machine ...

control systems. Their first product was a

vacuum tube A vacuum tube, electron tube, thermionic valve (British usage), or tube (North America) is a device that controls electric current flow in a high vacuum between electrodes to which an electric voltage, potential difference has been applied. It ...

radio released in 1955,, (English translation: "''1955: 4-tube radio, model unknown''") and their first

transistor radio A transistor radio is a small portable radio receiver that uses transistor-based circuitry. Previous portable radios used vacuum tubes, which were bulky, fragile, had a limited lifetime, consumed excessive power and required large heavy batteri ...

was the KR-6TS-1 radio released in the spring of 1957, at the price of 14,000 yen. Through the 1960s, Koyo had manufactured and sold millions of portable transistor radios, particularly, their best-selling model KTR-624 had been shipped over one million units in ten years since its release in 1961., (English translation: "''1961: 6-transistor radio, KTR-624 (Best-selling model shipped over one million units)''"), (English translation: "''KTR-624: 6-transistor radio sold over one million units until 1970, called roku-nii-yon (six-two-four), ...''") Their several models had been sold under other brands, and also supplied to other manufacturers including

Philco Philco (an acronym for Philadelphia Battery Company) is an American electronics industry, electronics manufacturer headquartered in Philadelphia. Philco was a pioneer in battery, radio, and television production. In 1961, the company was purchase ...

Grundig Grundig ( , , ) is a Turkish home appliances and consumer electronics brand. It is owned by Arçelik A.Ş., the white goods (major appliance) manufacturer of Turkish conglomerate Koç Holding. Originally a German consumer electronics comp ...

, etc., (English translation: "''1962: 8-transistor radio, 8J21P/KTR-837 (sold under both Philco and Koyo to ensure stable production volume)''") In August 1973, they ceased manufacture of audio products including radio receivers and record players., (English translation: "''Audio products such as transistor radios and record players were manufactured since 1955 until 1973, and built the foundation of our company.''")

Gallery

File:Vintage Eldorado 6-Transistor Radio, Model 6TS2, Made in Japan, Same Radio as the Koyo KR 6TS2 (12093823464).jpg, Koyo KR-6TS-2 (1959) under Eldorado brand File:Vintage TMK 10-Transistor AM Radio (No Model Number), Reverse Paint Sliderule Dial, Made in Japan (8507489229).jpg, Koyo KTR-624 (1961) under TMK brand (Toyomenka America) File:Vintage Grundig Multi-Band Radio, Model TR-807. 11 Bands, Made In Japan (13254538374).jpg, Koyo KTR-1770 (1970) 11-Band Radio sold as

TR-807

References

;Bibliography *
excerpted images: , , , and
(these images are found on: ) ;Brochures * , circa 1957. * , circa 1959. * These images are found on: )

External links

Audio equipment manufacturers of Japan Manufacturing companies based in Tokyo Japanese companies established in 1955 Electronics companies established in 1955 {{Japan-company-stub

See also

Gallery

References

External links