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This one is a solid-looking monoblock if the photos and seller story check out. At US$300, it lands above the US$243 75th percentile for your recent comps and well over the US$185 median, so I’d call it ambitious rather than fair; it’s not a bargain at this level.
That said, Proton gear has a good reputation for honest, muscular sound and this kind of older power amp can still be a rewarding buy for someone wanting straightforward drive and a clean, no-nonsense presentation. If it’s truly clean, unmodified, and comes from a careful owner with solid cosmetic condition, the upside is in getting a durable classic with decent current capability; just make sure the channel/relay behavior is healthy and that there’s nothing off in the listing photos, because the price leaves little room for repair risk.
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.
