Luxman 5K50

Name: Luxman 5K50
Brand: Luxman

The Luxman 5K50 shows up in the databases and in the odd owner's-manual reproduction, and almost nowhere else. The period press and the collector community left almost no trace of it. Three registry-level sources agree on the basics - a stereo receiver with an FM tuner, built with semiconductor circuitry - and then split on nearly everything else. RadioMuseum.org calls it a "stereo tuner," while HiFiEngine lists it as a receiver. The name is the same everywhere. No "5K50B" or "5K50II" variant turns up in any record.

The one solid block of documentation is the owner's manual, which survives only as a partial reproduction on manualslib.com. It covers the FM tuner section and nothing else. The published figures are usable sensitivity of 1.6 µV (IHF), signal-to-noise of 70 dB in mono, harmonic distortion of 0.3% (mono), selectivity of 60 dB at ±400 kHz, image rejection of 52 dB, IF rejection of 75 dB, and stereo separation of 42 dB at 1 kHz. Tuner frequency response is specified at 30 Hz to 15 kHz ±1 dB, and the antenna input is 300 Ω balanced. These specs are for the tuner only. No amplifier-section figures appear anywhere in the surviving documentation.

The gaps are real. No power output rating, no THD for the amp, no inputs or outputs listed, no dimensions, no weight, no original price, no production years. None of it is documented in any source we've found. The manual's amplifier pages may simply not have been captured in the reproduction, and the receiver almost certainly has more to it than an FM tuner, but we can't confirm what those pages said. There's also no mention of an AM band anywhere, though that doesn't necessarily mean the 5K50 lacked one.

Community response is thin but positive. HiFiEngine shows a single user rating of 9.00 out of 10, and RadioMuseum.org lists two threads in its forum section, though their contents aren't accessible in our records. There are no auction prices, no service notes and no repair threads. The 5K50 appears to have been a modest, competently-specified FM receiver, from the period when the company was also introducing its first cassette decks and pushing into the broader consumer market. The archive doesn't have the documentation to say more. A contemporary issue of Modern Recording (May 1979, p.33) noted Luxman's debut of cassette decks during this era, though it did not mention the 5K50.

Known specs (FM tuner section, from the owner's manual):