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The Proton 520-B is a modest but respected Japanese integrated amplifier from the late 1970s, known for clean power and reliable performance in entry-level hi-fi setups. At £105, this asking price is ambitious, sitting well above the 75th percentile of £94 and notably higher than the median of £83 for recent GBP listings; it’s not a bargain, but neither is it wildly out of line if the unit is in original, tested condition.
What makes the 520-B worthwhile is its straightforward, no-nonsense design: solid damping, warm but not muddy sound, and a durability that still serves well today. If this listing includes the original remote, dust cover, or recent cap replacements, the £105 becomes more justifiable as a premium for a clean, user-ready example. Watch for oxidized pots or cracked RCA jacks—common at this age—but if those are absent, it’s a solid, dependable buy for a budget analog system.
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.
