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This is a fair ask, leaning slightly to the good side of fair. At US$25, it lands just under the median used price of US$30 and below the 75th percentile of US$34, so it’s not a bargain-bin steal, but it is priced sensibly for a workable piece.
What makes it worth a look is that the SA-155 is a compact, well-liked little integrated amp that pairs easily with modest systems and often shows up as a simple, useful secondary piece. If the listing is complete with the needed cables and the unit is clean and functioning properly, the included accessories add practical value here; at this price, the main buy trigger is a tidy, ready-to-use example rather than chasing a cosmetic bargain.
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.
