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                  YS-Audio
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                  Manufacturer of tube amplifiers and pre-amplifiers. Hong Kong, China.
                   
                  
                  
                   
                  
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                  Pathos
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                  Manufacturer of valve integrated and monoblock amplifier.
                   
                  
                  
                   
                  
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                  Golden Middle
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                  Makes tubes amplifiers, preamplifiers, vacuum tubes components, sockets and transformers. Based in Saint-Petersburg, Russia.
                   
                  
                  
                   
                  
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