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Onkyo M-5160 Stereo Power Amplifier Delta Power Supply Circuit Design READAmplifier is in fair condition, and has not been fully tested by myself personally. I unfortunately do not have any control amplifiers at the moment, so I am unable to go further than just power testing this unit. Although the two buttons for the speaker outputs work just fine, the button for power is not locked into position, and moves around when pressed inward. Despite this, the amplifier still powers on like normal, and all display lights shine brightly as they should. Unit will be sold AS-IS described, and will not be eligible for returns whatsoever. Amplifier is not in the best shape cosmetically, showing obvious signs of age-related wear around the exterior. The metal bonnet is not dented along any edge or face that I can see, but the front of the unit has marks all across it that I have not been able to clean. See all pictures closely for details of condition, and specifications of the item. I specialize in shipping electronics such as this, and can guarantee that every precaution will be taken to ensure safe delivery of your purchase. Message me with any questions or concerns you may have. FREE SHIPPING ONLY TO THE LOWER 48 STATES
For a late-’80s/’90s-era stereo power amp, timing matters mostly because examples in clean, unmolested condition are getting harder to find, and this asking price lands well below the recent market. At US$129 against a US$151 25th percentile and US$233 median, it reads as a strong deal rather than just fair value.
That makes it attractive for someone wanting a straightforward, hefty two-channel amp with the sort of reserved, muscular presentation Onkyo made a good reputation on. The upside here is simple: if it’s genuinely clean, quiet, and fully functional, this is the kind of buy that can outperform its price. I’d only press for confirmation on basic health checks—stable channels, no protection faults, quiet operation, and decent binding posts—because on an older power amp, service history matters more than cosmetics.
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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