RADAR is a price search engine. We link to the original listing — we never sell direct. Transactions happen on the source site.
This receiver works in a limited capacity. The mode switcher button is broken. It works in the mode It is in and can likely be repaired. There is some corrosion on the back RCA connection points which may cause some connection issues.LOOK AT THE PICTURES AND ASK QUESTIONS, NO RETURNSTuning range: FM, MWPower output: 33W/ch (stereo), 28W/ch into 8Ω (quadraphonic)Frequency response: 10Hz to 20kHzTotal harmonic distortion: 0.5%Damping factor: 50Input sensitivity: 3.8mV (mic), 2.9mV (MM), 200mV (DIN), 200mV (line)Signal to noise ratio: 75dB (MM), 85dB (line)Output: 200mV (line), 35mV (DIN)Speaker load impedance: 4Ω to 16ΩSemiconductors: 8 x FET, 4 x IC, 113 x transistors, 62 x diodesDimensions: 560 x 170 x 430mmWeight: 21.3kg
At US$1,000, this is above the recent used-market median of US$875 and also over the 75th percentile of US$938, so it reads ambitious unless the unit is especially clean, serviced, or unusually complete. Without more condition detail, it’s not an obvious overpay, but it is priced at the top end for a vintage piece that should earn that premium only if the cosmetics and function are genuinely strong.
That said, the QX-9900 has real collector appeal: it’s a well-regarded quad-era Pioneer with strong build quality, distinctive styling, and enough rarity to draw buyers who want something beyond a standard stereo receiver. If it’s original, well-preserved, and comes with the right accessories or service history, the upside is in owning a showpiece that still has serious vintage charm; if not, I’d want to negotiate.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Pioneer traces its roots to 1937 in Tokyo, Japan, when founder Nozomu Matsumoto, inspired by the thrill of imported hi-fi speakers, developed the A-8 dynamic speaker and launched a radio and speaker repair shop. The business formalized as Fukuin Shokai Denki Seisakusho in 1938, evolving into Pioneer Corporation and embodying Matsumoto's philosophy of "Move the Heart and Touch the Soul" through audio innovation.
The brand excels across diverse hi-fi categories, pioneering Japan's first headphones in 1960 with the SE-1 and the world's first component-based stereo system in 1965 via the PSC-5A. Pioneer's portfolio spans amplifiers, speakers, turntables, and DACs, alongside landmark car audio advancements like the 1975 Supertuner-equipped stereo and the 1986 in-car CD player, blending home and automotive excellence.
Today, Pioneer holds a commanding mid-to-high-tier position in the market, revered for reliable, performance-driven gear that balances premium quality with accessibility. Its vintage components attract collectors, while current offerings appeal to discerning buyers seeking robust, innovative sound reproduction without boutique excess.
See all Pioneer listings on RADAR.
