Koyo Electronics Corporation Limited
|Romanized name||Kōyō Denki, K.K.|
|Subsidiaries||Koyo Electronics Industry|
|Romanized name||Kōyō Denshi Kōgyō, K.K.|
|Founded||March 18, 1959in Tokyo|
|Headquarters||Tenjin-cho, Kodaira, Tokyo|
|Products||Electronic control devices, imaging devices, automotive devices, factory automation control systems|
Koyo Electronics (Kōyō Denki) and its subsidiary Koyo Electronics Industry (Kōyō Denshi Kōgyō), often collectively referred to as just Koyo, are the Japanese electronics companies based in Kodaira, Tokyo that manufactured radios since 1955 until 1973, and now its subsidiary manufactures industrial electronics devices and factory automation control systems.
Their first product was a vacuum tube radio released in 1955, and their first transistor radio 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. Their several models had been sold under other brands, and also supplied to other manufacturers including Philco, Grundig, etc.
However in the August 1973, they ceased manufacture of audio products including radio receivers and record players.
- "Company Data" (official site). Koyo Electronics Industries Co., Ltd. 2014.
- "History of the radio manufacturer: Koyo Denki Co. Ltd.; Kodaira, Tokyo". radiomuseum.org.
- Fifty Years History, History of products, (English translation: "1955: 4-tube radio, model unknown")
- Koyo Brochure c.1957.
- Fifty Years History, History of products,
- Fifty Years History, KR-6TS-1
- "Koyo KR-6TS1" (photos: front, rear, inside, rear cover). RadioWallah (tabiwallah.com).
Koyo's first transistor radio, the KR-6TS1 went on sale in the spring of 1957 at a list price of ¥14,000, (with leather case and battery). ...
- Fifty Years History, History of products, (English translation: "1961: 6-transistor radio, KTR-624 (Best-selling model shipped over one million units)")
- Fifty Years History, Nostalgia of audio equipment, (English translation: "KTR-624: 6-transistor radio sold over one million units until 1970, called roku-nii-yon (six-two-four), ...")
- Fifty Years History, History of products, (English translation: "1962: 8-transistor radio, 8J21P/KTR-837 (sold under both Philco and Koyo to ensure stable production volume)")
- Fifty Years History, History of products, (English translation: "Audio products such as transistor radios and record players were manufactured since 1955 until 1973, and built the foundation of our company.")
- 光洋電子工業５０年史 [Koyo Electronics Industries' Fifty Years History] (in Japanese). Koyo Electronics Industries. 2009.
excerpted images: "Nostalgia of audio equipment"., "History of products / audio equipment"., "Our first transistor radio KR-6TS-1"., and "MITI Good Design Award winning radio, KR-6TS-2".
(these images are found on: Ken-ichi Arai (2014). "KOYO ラジオ/".
2014-09-13 ... この度、inさんから送って頂いた「光洋電子工業５０年史」...)
- Ultra-compact Koyo Radios - Transistors & Sub miniature tubes (brochure). Chūō, Tokyo: Koyo Electronics Co., Ltd. (Kōyō Denki)., circa 1957.
- Koyo Transistor Radio (brochure). Chūō, Tokyo: Koyo Electronic Industories Co., Ltd. (Kōyō Denshi Kōgyō)., circa 1959.
(these images are found on: "KOYO 光洋の製品カタログ".
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