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The SA-155 sits in that useful little niche of practical vintage accessories: not flashy, but handy when the right piece shows up. At US$45, this is above the typical used market for this item, which centers around a US$30 median with a US$25 to US$35 interquartile range, so the asking price reads ambitious rather than a deal.
It can still make sense if you specifically need this cable/accessory and the piece is clean, complete, and ready to use. The upside here is convenience more than collectible cachet, so value depends heavily on condition and whether it saves you the hunt for a correct match; otherwise, there are plenty of fairer buys closer to the median.
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.
