xDuoo TA-26S
A $319 tube amp built like a tank for 300-ohm Sennheisers — warm to most ears, neutral to some, and only as quiet as your wall socket.
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xDuoo
Affordable tube & hybrid headphone amps
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xDuoo is a Chinese audio brand making portable and desktop headphone gear — DAC/amps, Bluetooth receivers and a wide range of tube and hybrid-tube headphone amplifiers at modest prices.
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Prices in USD, recorded when each review was updated.