Audiophilepure

Of course the biggest feature here is the presence of vacuum tubes, for which Astell&Kern did a lot of work on minimizing the microphonic noise. AK uses a matched set of RAYTHEON JAN6418 miniature vacuum tubes, which are very popular in portable audio designs nowadays. This tube is designed to meet military specifications and traditionally was used in military communication equipment. It quickly garnered recognition for its distinctively warm and soft sound, leading to its integration into regular audio devices.

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