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US$500 is a solid buy for a Delta 100 if it’s functioning properly and not cosmetically rough. Typical used examples seem to land around the mid-hundreds into the low-US$700s, so this sits on the buyer-friendly side rather than feeling ambitious.
What makes it worthwhile is straightforward: PS Audio’s Delta-era amps are known for strong drive, lively dynamics, and a clean, controlled presentation that still pairs well with real-world speakers. If the seller can confirm stable operation, no channel imbalance, and original caps/serviced history, this is the kind of older high-power stereo amp that can still deliver a lot of sound for the money.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
PS Audio, a pioneering American hi-fi brand, traces its roots to 1973 when co-founder Paul McGowan launched the company in California alongside Stan Warren. Emerging from the analog golden age, it debuted with a standalone phono preamplifier, reflecting McGowan's early passion for vinyl playback honed through radio station connections and encounters with audio enthusiasts. The brand quickly evolved, embracing digital audio in the 1980s by releasing one of the first high-end CD players, the PS Audio CD-1, soon after Philips and Sony introduced the format.
Today, PS Audio specializes in premium electronics, including power amplifiers, preamplifiers, digital-to-analog converters (DACs), and integrated amplifiers, with a hallmark focus on power conditioning via innovative AC regenerators known as Power Plants. These devices, born from Stan Warren's mid-1980s discovery that oversized transformers enhance audio performance, remain a cornerstone. The lineup also encompasses digital lenses for refining streaming and disc playback, alongside select analog components, though it eschews speakers, headphones, turntables, or cables.
Positioned firmly in the high-end market, PS Audio commands respect among discerning audiophiles for its bold engineering and unwavering pursuit of musical purity. Celebrating 50 years in 2023, it occupies a niche as an innovator rather than a mass-market player, appealing to buyers who prioritize transformative power delivery and digital refinement in sophisticated systems.
See all PS Audio listings on RADAR.
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