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                  Mapletree Audio Design
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                  Tubes amplifiers and pre-amplifiers designed and hand crafted by Dr. Lloyd Peppard, a retired electronics engineering professor.
                   
                  
                  
                   
                  
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                  Dussun
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                  Previously known as Korsun, manufacturer of integrated, multi-channel and stereo amplifiers in China.
                   
                  
                  
                   
                  
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                  Vintone Circuits
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                  Designer and builder of custom guitar amplifiers and speakers housed in exotic hardwood cabinets.
                   
                  
                  
                   
                  
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                  Transcendent Sound
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                  Manufacturer of tube amplifiers, DIY audio kit, audio projects, and preamplifiers. Provides forum and product information.
                   
                  
                  
                   
                  
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                | 5.  | 
                
                  
                  Tenor Audio
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                  Quebec high-end tube amplifiers with a wooden finish.
                   
                  
                  
                   
                  
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