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Vintage 1990s YAMAHA MX-M70 50w Mono Power Amp -- ORIGINAL OWNER20Hz to 20kHz Frequency Response; 0.01% THD; Impedance 8Ω; 117 dB S/N RatioUp for consideration is a vintage 1990s Yamaha MX-M70 -- a 50w monoblock power amp, designed to drive a center channel on a surround system. These are from Yamaha's Natural Sound series, and as the name implies it delivers a clear, natural sound with excellent specs, if you don't need a lot of power. Works great as a center channel amp, and it was used that way in a preamp + power amp surround setup. The Boston Acoustic center channel speaker it was paired up with is also being sold separately in another listing.The power amp is in very good condition, and works flawlessly, as it has from day 1. Relatively lightweight at 8.6 lbs, and also small enough in size at 8.5" x 5.4" x 13.5" so it is easy to set up with good portability and easy placement. PLEASE CHECK OUT our other Reverb listings for other Trace TA-100 replacement parts, as well as other gear -- and we are also the world's leading manufacturer of Multi-String Classical Harp guitars -- with over 600 Bartolex, Milagro, and Cathedral multi-string guitars sold during the last 18 years. Thanks for shopping with Cathedral Guitars / Flickinger Audio!
This is a notable little score: at US$85, it sits right on the market median and exactly at the 25th percentile, so the asking price reads as fair-to-good rather than merely average. For a Yamaha monoblock, that’s a sensible entry point if the unit is clean and working properly; it isn’t a steal, but it is priced like a real used-hifi buy.
The appeal here is straightforward: Yamaha’s older power pieces are usually valued for their solid build, honest drive, and dependable, no-nonsense sound. If this one is original, unmodified, and comes from a careful owner, the upside is a straightforward amp that should slot neatly into a serious vintage system. At this price, the main thing to verify is basic function and physical condition; if both check out, it’s an easy recommend.
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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