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This US$32 listing sits right above the median of US$30 for the Optimus SA-155, making it a fair price rather than a bargain, though it remains well below the 75th percentile of US$33. Given that the SA-155 is a vintage Radio Shack/Realistic era unit originally costing around US$60 new, the current asking price reflects typical value for a tested, working example in the used market today.
The SA-155 is a well-regarded entry-level integrated amplifier that delivers clean 6 watts per channel, sufficient for small rooms or bookshelf speakers, and is often praised for its reliable, no-nonsense performance. Since the listing notes it is “tested” and includes cables, it offers immediate usability without the usual hunt for accessories, presenting a solid buying opportunity for enthusiasts seeking affordable, functional vintage hi-fi at a fair market rate.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Optimus is best known as a RadioShack private-label audio brand rather than an independent hi-fi manufacturer. The name traces back to RadioShack’s in-house branding, with “Optimus” used on some products from the late 1960s and more broadly on audio gear in the 1980s and 1990s. It does not have a clearly identifiable standalone founder in the way a dedicated hi-fi brand would; its heritage is tied to the RadioShack retail chain in the United States.
The line covered a broad range of consumer electronics, including stereo receivers, amplifiers, speakers, cassette decks, turntables, and later some home-theater and portable audio products. Depending on the era, many Optimus components were sourced from overseas OEM manufacturers, especially in Asia, and sold through RadioShack’s stores as house-brand alternatives to mainstream consumer audio lines.
In the market, Optimus sits firmly in the mass-market and mid-fi category rather than the high-end segment. Today it is mostly remembered by vintage-audio collectors and RadioShack enthusiasts, with certain receivers and speakers drawing interest for their retro appeal and occasional value. It is not generally regarded as a boutique or audiophile-first brand, but some models remain noteworthy for solid build and nostalgic charm.
See all Optimus listings on RADAR.
