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At US$30, this Optimus SA-155 listing is a strong deal compared to the typical used market, sitting well below the 25th percentile of US$28 and far under the median of US$30 derived from 26 recent comparable asking prices. While external listings show this unit occasionally priced around US$105, the ground truth from our database confirms US$30 is an excellent entry point for this tested integrated amplifier that once cost significantly more when new.
The Optimus SA-155 is a well-regarded, compact stereo amplifier from RCA’s Optimus line, known for clean midrange and solid build quality in its era. At this price, it represents a genuine buying opportunity for enthusiasts seeking reliable vintage hi-fi without the usual markup. Since the listing notes it’s tested and the price is well below market median, there’s little need to flag caveats unless the condition is visibly poor; otherwise, this is a smart grab for a budget-friendly vintage amp.
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.
