Bruce Heran has introduce a new audio device familiar and known to the general public as tube headphones. These tube headphone amp share the well crafted design by Oddwatt which is responsible for the amplifier which delivers a sound that goes far beyond the average tube headphone amp. The 6DJ8 tube headphone amp article is a good read.
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DIY Audio Projects – Hi-Fi Blog for DIY Audiophiles: 6DJ8 Tube Headphone Amp