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4 Watt Custom Built Industrial  over spec valve Power Amplifier And Power Supply
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4 Watt Custom Built Industrial over spec valve Power Amplifier And Power Supply

USD$1,818 GBP$1,333
Location
GB
Seller
louad-68
Source
eBay UK
Posted
19 Aug 2026
Last seen
2d ago

RADAR is a price search engine. We link to the original listing — we never sell direct. Transactions happen on the source site.

Our Thoughts RADAR AI

Against your own comps, £1,409 is clearly ambitious: it sits well above the £1,148 75th percentile and is nearly 5x the £307 median. That doesn’t make it impossible, but it does mean the asking price needs a very strong justification in terms of build quality, bespoke execution, or unusually serious parts choices.

For a niche custom valve amp, the upside is usually in the craftsmanship and the appeal to a buyer who specifically wants something hand-built and over-engineered rather than a mainstream commercial piece. If the power supply is truly well sorted, the build is clean, and the unit is fully proven, it could be a rewarding buy for the right system—but at this level, I’d want clear evidence of who built it, what components were used, and whether service support is straightforward before paying top money.

Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.

About SPEC

SPEC is a Japanese hi-fi brand founded in 2010 by former TEAC and Pioneer engineer Shirokazu Yazaki, whose work was driven by a clear aim: to recreate the immediacy and tonal density of valve amplification using modern solid-state design. That origin gives the company a distinctly engineer-led, specialist identity rather than a mass-market one.

The brand is best known for integrated amplifiers and digital disc players, especially SACD players, with its “Real Sound” class D approach at the center of its product philosophy. SPEC also emphasizes proprietary parts choices and circuit tuning, which is part of its appeal to listeners who value voicing and musical presentation over spec-sheet minimalism.

In the market, SPEC sits in the niche high-end category: boutique, technically distinctive, and aimed at committed audiophiles rather than mainstream buyers. Its reputation is strongest among enthusiasts who are curious about unconventional class D implementations with a tube-like character; it is less of a broad-line brand than a specialist one.

See all SPEC listings on RADAR.

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