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Mjölnir Audio Pure BiPolar headphone amp.2 Watts into 110 Ohms, 0.0015% THD at 1 Volt into a 20 Ohm load, Output Impedance 0.83 Ohms, fully balanced, high-bias Class A architecture utilizing bipolar output transistors."Super Symmetry" (SuSy) input stage. This design naturally converts a single-ended (RCA) input signal into a true, fully balanced signal inside the amp without requiring extra operational amplifier (op-amp) circuitry. The Pure BiPolar is fundamentally an updated and heavily upgraded variation of Kevin Gilmore’s legendary Dynalo amplifier design.
At US$1,693, this is well above the typical used market for the kind of comparable listings here: the median is US$159 and even the 75th percentile is only US$400, so the asking price is clearly ambitious. That doesn’t automatically make it wrong for a boutique high-end piece, but it does mean the value has to come from rarity, condition, and completeness—not from any expectation of a bargain.
The upside is that this is a serious discrete headphone amp with a strong reputation for transparency, drive, and balanced operation, and owners who want a clean, powerful, no-nonsense amp tend to keep these for a reason. If it’s truly clean, fully working, and comes with the right power supply and balanced hookup options, it could still be a compelling buy for someone specifically chasing this sound—but at this price, I’d want proof of excellent condition and a very complete package.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Pro-Ject Audio Systems traces its roots to 1991 in Austria's Weinviertel region, north of Vienna, where founder Heinz Lichtenegger launched the brand amid the CD revolution. Kicked out of music school as a youth, Lichtenegger channeled his passion for analog sound into affordable, high-quality turntables at a time when vinyl seemed obsolete. His debut Pro-Ject 1, hand-assembled in the Czech Republic, earned rave reviews as a top high-end device, igniting a success story that relocated headquarters to Vienna before returning to Mistelbach in Lower Austria.
The brand excels in turntables, establishing itself as the world's largest and leading producer in that category, while expanding into a full spectrum of hi-fi components since 2000. Offerings include amplifiers, DACs, headphone amps, speakers, cables, and phono stages, all emphasizing essential sound reproduction with durable materials and minimalist design. Manufacturing remains European—primarily in Czechia, Slovakia, and Germany—prioritizing sustainability through local sourcing, short transport, and products built for longevity.
Pro-Ject holds a commanding niche as the go-to for mid-tier audiophiles seeking boutique European craftsmanship without extravagant pricing. Distributed in over 80 countries, it appeals to vinyl revivalists and discerning buyers who value analog purity, innovation, and value-driven performance over flashy excess, cementing its reputation as a pioneer in accessible high-fidelity.
See all Pro-Ject listings on RADAR.
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