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SAE MK31-B Stereo Amplifier (A4R/JSF6) Original Box Tested EUC Mark XXXIB
SAE 5 views

SAE MK31-B Stereo Amplifier (A4R/JSF6) Original Box Tested EUC Mark XXXIB

USD$250
Location
US
Seller
jackofallstuff
Source
eBay US
Posted
13 May 2026
Last seen
2d ago

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Our Thoughts RADAR AI

At US$250, this lands a bit under the US$275 median and comfortably above the US$197 25th percentile, so it reads as a fair-to-good buy rather than a steal. It’s not priced low enough to call it a bargain, but it’s close enough to the middle of the pack that the box and tested status matter.

The appeal here is straightforward: a solid vintage stereo integrated from a respected era, with original box and test confirmation adding real buyer confidence and resale appeal. If you want a straightforward, no-frills amp for a secondary system or a vintage stack, this is the sort of listing worth considering. I’d mainly check that all controls are quiet, both channels are healthy, and the cosmetic condition matches the “EUC” claim.

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

About SAE

# SAE (Scientific Audio Electronics)

Scientific Audio Electronics emerged from Los Angeles in 1968 when Morris Kessler partnered with Ted Winchester and Beth Winchester to pursue an ambitious goal: building the world's finest audio amplifier. Kessler had been designing and hand-building amplifiers since the early 1960s, and the partnership formalized his vision into a commercial enterprise. The company operated through the 1980s, establishing itself as a significant player in the golden age of solid-state hi-fi before ceasing operations in 1988.

SAE built its reputation almost exclusively on power amplifiers, introducing the Mark 2—a 60-watt solid-state design that earned comparison to the legendary Marantz Model 9 tube amplifier in Stereophile magazine. Beyond amplifiers, the company pioneered several audio innovations, including the world's first graphic equalizer, the first digital read-out tuner, and the first phonograph pop-and-click filter. These products reflected SAE's engineering-forward philosophy and commitment to advancing high-fidelity technology.

SAE occupies a revered position in vintage hi-fi collecting and audio history. During the 1970s, the company was synonymous with high-end solid-state amplification, competing directly with established names like McIntosh, Marantz, Pioneer, and Sansui. Their equipment commanded premium pricing—a complete SAE rack system retailed for $6,000, equivalent to a top-tier Cadillac. Today, SAE remains a collector's brand, remembered by audiophiles as a legitimate innovator that produced musically open and refined components during hi-fi's most formative era.

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