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Recent comparable listings put this model at a US$30 median, with the typical middle half running from US$25 to US$35. At US$40, this is above the 75th-percentile asking price, so it’s ambitious rather than a bargain—especially with the condition listed as unknown. A tested, complete example would make the price easier to justify, but an unverified unit should be closer to the market median.
The SA-155 is a charmingly compact integrated amp with useful line inputs, a magnetic-phono option, and surprisingly capable sound with efficient speakers. Its modest power suits desktop, bedroom, and small-room systems, not demanding speakers or loud listening. Before buying, confirm that both channels work cleanly, the controls and input selector are quiet, the phono input functions, and the correct power cord is included. At US$25–US$30 it’s an appealing little vintage buy; at US$40, testing and completeness matter.
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.
