Japan
Uesugi Sangyo is a vacuum tube amplifier manufacturer founded by Uesugi Kazuo, who has long advocated for the superiority of vacuum tubes in audio amplifiers. The company uses high-quality vacuum tubes, which it considers a cultural heritage, to produce high-quality amplifiers. Established as a limited liability company, Uesugi Research Institute focuses on vacuum tube technology and provides repair services. The company maintains a list of authorized dealers for product sales and offers downloadable resources. Founded by Uesugi Kazuo, the company has been operating since its establishment.
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