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With condition unknown, US$550 looks ambitious for a P-304. Typical realized prices for this Onkyo sit more in the mid-hundreds, so this is above the usual market unless it’s exceptionally clean, recently serviced, or comes from a documented top-tier seller with strong testing.
That said, the P-304 is a respected vintage preamp: quiet, refined, and especially well-liked for its phono stage and solid build. If the unit is fully functional, original, and has no scratchy controls, it can still be a rewarding buy. At this price, I’d want clear confirmation on recapping/service history, input selector behavior, and phono performance before jumping.
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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