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Yamaha A-550 integrated stereo amplifier in good condition. Service and inspected for proper operation. SpecificationsPower output: 40 watts per channel into 8Ω (stereo)Frequency response: 4Hz to 70kHzTotal harmonic distortion: 0.01%Damping factor: 50Input sensitivity: 2.5mV (MM), 150mV (line)Signal to noise ratio: 98dB (MM), 104dB (line)Channel separation: 65dB (line)Output: 150mV (line)Semiconductors: 45 x transistors, 2 x IC, 21 x diodes, 1 x zener diodeDimensions: 435 x 117 x 338mmWeight: 7.8kgLocal pick up / inspection / purchase available at Archer High Fidelity in Falls Church, VA. We are a vintage sales and service specialist covering the Washington DC metro area.All major credit cards accepted, as well as PayPal, check on clearing, and Venmo.Any other questions, please feel free to ask.
This used Yamaha A-550 listed at US$195 is a standout bargain, sitting well below the 25th percentile of US$209 for comparable units in the USD market, where the median is US$223. You are securing a genuine deal with immediate upside, as the price is significantly lower than the typical range and far under the US$236 75th percentile.
The A-550 is a respected budget amplifier from 1979–81, delivering 40 watts per channel and praised for its clean, natural sound that handles vintage gear with ease. Its clean listing at this price represents a prime buying opportunity for enthusiasts seeking a reliable, original-owner unit without the need for immediate servicing or accessory hunting.
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.
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