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YAMAHA MX-800U STEREO AMPLIFIERSuperb condition, looks like new. This is being sold from a high-end collector's collection. It has been extremely well cared for and stored in a pet-free air-conditioned home. It has been fully tested, and it works and sounds amazing! SpecificationsPower output: 170 watts per channel into 8Ω (stereo)Frequency response: 20Hz to 20kHzTotal harmonic distortion: 0.003%Damping factor: 90Input sensitivity: 1.32VSignal to noise ratio: 120dBSpeaker load impedance: 4Ω to 16ΩDimensions: 17-1/8 x 6-1/2 x 16-3/4 inchesWeight: 31.9lbsIt has been fully tested, and it works and sounds amazing!
Ambitious asking price at USD599 for a used Yamaha MX-800U—it's pushing the upper end of the typical USD562–587 range from recent comparable listings.
With a median around USD574, this sits above the 75th percentile, making it a stretch unless the condition is pristine or it includes sought-after upgrades. Fair market comps suggest room to negotiate down to USD580 or better for a solid example.
Buyers should verify the output transistors and power supply caps, as these '80s beasts often fail from heat stress after decades—insist on bias current checks and recent service records. Confirm all original accessories like the wooden side panels and power cord are included, and test for channel balance to rule out imbalance issues.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Yamaha stands as one of the world's most storied audio manufacturers, with roots extending far beyond consumer electronics. Founded in 1887 by Torakusu Yamaha in Hamamatsu, Japan, the company began as a reed organ manufacturer before expanding into pianos and eventually becoming a comprehensive musical instrument maker. This deep heritage in acoustics and materials science would prove foundational to its later audio ventures. The company operated under its original name, Nippon Gakki Co., Ltd., until 1987, when it was renamed Yamaha Corporation in honor of its centennial.
Yamaha's entry into high-fidelity audio proved transformative for the industry itself. In 1954, the company released the Yamaha Hi-Fi Player, widely recognized as the world's first audio component to bear the "Hi-Fi" designation in its name. The company subsequently built a comprehensive product portfolio spanning amplifiers—beginning with the acclaimed A-100 in 1960—speakers, turntables, and digital audio equipment. The NS-1000 speakers, introduced in 1974 with beryllium drivers, became iconic reference monitors. Yamaha also pioneered digital audio technology, shipping the world's first CD recorder in 1988.
Today, Yamaha occupies a distinctive position as a mid-to-high-end generalist rather than a niche specialist. The brand commands respect among both casual listeners and serious audiophiles, balancing accessibility with genuine engineering credibility. Its reputation rests on six decades of consistent innovation, proven reliability, and the unique advantage of applying musical instrument expertise to audio reproduction. Vintage Yamaha components remain highly sought by collectors, while current products maintain the brand's tradition of delivering performance and durability across multiple price tiers.
See all Yamaha listings on RADAR.
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