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The Proton 520-B is a respected late-80s Japanese integrated that delivers clean 20W per channel and includes both MM and MC phono inputs, making it a versatile small-room amplifier. At £63, this listing is a strong bargain, sitting well below the 25th percentile of £73 and significantly under the median of £83 from recent GBP comparables. This price point represents genuine value for a functioning unit in this class.
Beyond the price, the 520-B is well-regarded for its low distortion (0.015% THD) and thoughtful features like the DAD (CD) input and ACC protection circuit. The real upside here is the opportunity to own a solid, well-built integrated with high-quality phono stages for under £70. Unless the condition is questionable or critical accessories are missing, this is a clear buying opportunity for enthusiasts seeking affordable, capable hi-fi.
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.
