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Against the recent comparable market, US$699 is a strong buy on this amp: it sits well below the US$962 25th percentile and far under the US$1,600 median, so this is priced like a bargain rather than a routine fair-market listing. For a buyer who already wants an M-508, that kind of gap leaves real room for servicing or cosmetic cleanup and still keeps it attractive.
The M-508 is well liked for its hefty build, big power reserves, and clean, controlled sound; it’s the sort of vintage Onkyo that still has real enthusiast appeal. If it’s healthy and reasonably complete, the upside is solid, but with any amp of this age the key checks are whether it powers up cleanly, runs quietly, and has no relay, channel, or meter issues.
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.
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