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This is a strong buyer’s market for vintage Onkyo power amps, and the US$150 asking price for the Onkyo M-5140 is a genuine bargain, sitting well below the 25th percentile of US$180 from recent comparable listings. Based on our database of four USD listings, the median is US$242 with a 75th percentile at US$312, so US$150 represents significant upside for a buyer willing to take a quick look.
The M-5140 is a respected 1980s stereo power amplifier delivering 105 watts per channel into 8Ω, known for clean, solid performance and reliable build quality typical of Onkyo’s Integra line. At this price, even with unknown condition, the potential value is high if it’s functional or easily serviceable—especially if it’s MIJ (Made in Japan) and includes original accessories. This is a buying opportunity, not a risk, for an enthusiast who can assess or restore it.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Onkyo traces its roots to postwar Japan, founded in 1946 in Osaka by Takeshi Goda, an engineer at Matsushita Electric who envisioned high-quality Japanese loudspeakers. Initially established as Osaka Denki Onkyo K.K., the company began production in 1948 with the acclaimed ED-100 speaker featuring a 25 cm driver, quickly building a reputation through LP concerts and innovative designs that resonated with audiophiles.
The brand excels in premium home audio, renowned for AV receivers, hi-fi amplifiers, and surround sound speakers that deliver exceptional clarity and power. Its portfolio spans turntables, DACs, headphones, and cables, bolstered by acquisitions like Pioneer's home electronics division in 2015, enabling cutting-edge integrations such as internet radio and high-resolution streaming.
Onkyo holds a solid mid-tier position in the hi-fi market, prized by discerning buyers for reliable performance and value rather than ultra-high-end exotica. Despite bankruptcy challenges in the late 2010s, its revival under new ownership preserves a legacy of technological innovation and pure sound enjoyment, appealing to both vintage enthusiasts and modern home cinema setups.
See all Onkyo listings on RADAR.
