Koyo Electronics Corporation Limited

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Koyo Electronics Co., Ltd.[1]
(Koyo Denki, Co., Ltd.)[citation needed]
Native name
Kōyō Denki, K.K.
Founded 1955 (1955) in Tokyo[1]
Products Portable radios[1]
Subsidiaries Koyo Electronics Industry
Koyo Electronics Industry Co., Ltd.
Native name
Kōyō Denshi Kōgyō, K.K.
Founded March 18, 1959 (1959-03-18) in Tokyo[1]
Headquarters Tenjin-cho, Kodaira, Tokyo[1]
Products Electronic control devices, imaging devices, automotive devices, factory automation control systems[1]
Website koyoele.co.jp/english/

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[2] that manufactured radios since 1955 until 1973, and now its subsidiary manufactures industrial electronics devices and factory automation control systems.[1]

Their first product was a vacuum tube radio released in 1955,[3][4] and their first transistor radio was the KR-6TS-1 radio released in the spring of 1957[5][6] at the price of 14,000 yen.[7] 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.[8][9] Their several models had been sold under other brands, and also supplied to other manufacturers including Philco, Grundig, etc.[10]

However, in the August 1973, they ceased manufacture of audio products including radio receivers and record players.[11]



  1. ^ a b c d e f g h "Company Data" (official site). Koyo Electronics Industries Co., Ltd. 2014. 
  2. ^ "History of the radio manufacturer: Koyo Denki Co. Ltd.; Kodaira, Tokyo". radiomuseum.org. 
  3. ^ Fifty Years History, History of products, (English translation: "1955: 4-tube radio, model unknown")
  4. ^ Koyo Brochure & c.1957.
  5. ^ Fifty Years History, History of products,
  6. ^ Fifty Years History, KR-6TS-1
  7. ^ "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). ... 
  8. ^ a b Fifty Years History, History of products, (English translation: "1961: 6-transistor radio, KTR-624 (Best-selling model shipped over one million units)")
  9. ^ a b 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), ...")
  10. ^ a b 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)")
  11. ^ 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.")

  (these images are found on: "KOYO 光洋の製品カタログ". (カタログ資料は うたくんさん提供) )

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