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This is a strong deal at USD 50—well below the USD 131 25th-percentile price from 37 recent comparable listings, and less than a quarter of the USD 209 median. With the manual included, it looks like an especially attractive entry point rather than merely a cheap gamble.
The 440 is a genuinely capable vintage tuner: sensitive, quiet on FM, and equipped with digital tuning, station presets, and Proton’s switchable Schotz noise-reduction circuit. It is particularly appealing for everyday FM listening and weaker-signal reception, while the manual adds useful ownership value. Before buying, confirm that the display, presets, stereo lock, AM/FM reception, and RCA output all work; at USD 50, even a few age-related imperfections would not erase the bargain.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Proton Electronic Industrial Co., Ltd. emerged from Taiwan in 1981, establishing its base in Banciao, Taipei-Hsien, as a manufacturer targeting the U.S. consumer audio market with high-quality components. Linked to Fulet Electrical, which produced notable NAD amplifiers, the brand launched around 1984 to expand into consumer electronics, including acclaimed TV monitors like the 600M and 602M models. By 2009, it remained active, building on a heritage of precision engineering from shared facilities with brands like NAD and Dynaco.
The company focused on premium hi-fi gear optimized for real-world performance, emphasizing tuners, receivers, amplifiers, and integrated systems that drove everyday loudspeakers with exceptional clarity. While not delving into headphones or cables, Proton's lineup prioritized robust playback under practical listening conditions, from radio reception to vinyl and cassette sources, earning praise for its engineering rigor in the 1980s.
Proton holds a solid reputation in vintage hi-fi circles as a mid-tier powerhouse, favored by collectors for its reliable, high-value sound that punched above its price point. Positioned as an accessible alternative to elite brands, it appeals to discerning buyers seeking durable, no-nonsense performers rather than boutique exotica, with ongoing interest in its schematics and restored units.
See all Proton listings on RADAR.
