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This US$20 asking price for the RCA SA-155 is a strong deal, sitting at the very bottom of the recent market where the 25th percentile is also US$20 and the median is US$20. You are essentially buying at the floor of the current used market based on 14 comparable listings, making this a genuine bargain for a functional unit.
The SA-155 is a beloved mini integrated amplifier (often cross-branded as Radio Shack Optimus) that delivers surprisingly loud and clear audio for desk or shop setups despite its low 1.8W RMS power. It shines with flexible switching, including a front AUX jack that disables rear inputs, a mono button, and switcheable phono inputs for ceramic or magnetic cartridges. At this price, the upside is immediate enjoyment in small spaces or as a backup system, with minimal risk even if condition is unknown.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
RCA traces its origins to 1919, when the Radio Corporation of America emerged from a U.S. government-backed reorganization of the Marconi Wireless Telegraph Company of America, prioritizing national security in radio technology. Born in the United States amid post-World War I innovation, the company lacked a single notable founder but was propelled by visionaries like David Sarnoff, who foresaw radio's mass-market potential. Its heritage spans a century of pioneering milestones, from acquiring the Victor Talking Machine Company in 1929—bringing the iconic "His Master's Voice" Nipper dog trademark—to launching early television at the 1939 New York World's Fair and shaping Nashville's recording scene through RCA Studios.
Historically a titan in consumer electronics, RCA focused on radios, phonographs like the famed Victrola, records, and later innovations such as eight-track tapes and magnetic recording. Today, under VOXX International, the brand emphasizes accessible audio-video accessories, including speakers, turntables, headphones, and portable systems, rather than specialized hi-fi components like amplifiers, DACs, or high-end cables.
RCA holds a venerable position as a vintage icon and entry-level mainstay, evoking mid-20th-century American living rooms rather than high-end audiophile pursuits. Its reputation rests on reliable, value-driven performance for everyday listeners, appealing to nostalgia seekers and budget-conscious buyers over niche boutique or collector-grade exclusivity.
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