RADAR is a price search engine. We link to the original listing — we never sell direct. Transactions happen on the source site.
US$135 looks fair-to-good, not a steal. Recent asking/sold evidence for the PMA-520AE/PMA-520 family clusters roughly around US$120 to US$145 for used units, with one sold listing at about US$136 plus shipping and another store listing at about US$68 equivalent for the AE version, so US$135 sits near the middle of the real-world used market rather than below it.
What makes it worth a look is the Denon house sound and sensible feature set: clean, high-current integrated amp, MM phono stage, multiple line inputs, and enough power for typical bookshelf or efficient floorstanding speakers. If the unit is genuinely healthy, the main upside is getting a well-regarded, straightforward amp that’s easy to live with; at this price, I’d want confirmation that all inputs, controls, and the phono stage are quiet and working properly, plus no scratchy pots or relay issues.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Denon traces its origins to 1910, when American entrepreneur Frederick Whitney Horn founded Japan's first audio equipment company, Nipponophone, initially focused on gramophones and records. The Denon brand emerged in 1939 from the merger of Japan Denki Onkyo—combining "den" for electricity and "on" for sound—with other entities, marking a shift toward professional audio development. This heritage includes pioneering Japan's first professional disc recorder in 1945, used to capture Emperor Hirohito's voice, and launching the nation's first long-playing records in 1951.
The brand excels across a broad spectrum of hi-fi categories, from amplifiers, turntables, and tuners to loudspeakers, cassette decks, and phono cartridges. Denon's innovations extend to digital frontiers, such as the world's first practical PCM recorder in the early 1970s, the inaugural CD player in 1981, and early home theater systems with Dolby Digital in 1995. Today, its lineup encompasses AV receivers, headphones, wireless streaming solutions like HEOS, and high-channel processors, blending professional-grade components with consumer accessibility.
Denon holds a commanding position as a mid-to-high-end mainstay in the hi-fi market, revered for its blend of technological firsts, robust build quality, and balanced sound signatures that appeal to discerning enthusiasts. No longer a vintage collector's niche, it competes confidently against premium rivals, backed by over a century of audio leadership and strategic partnerships like its merger with Marantz.
See all Denon listings on RADAR.
