vacuum tube

  1. Xulonn

    From Atmasphere - how to properly (and neatly) wire a vacuum tube amplifier...

    For many years I have been aware of the OTL (Output-TransformerLess) vacuum tube amplifiers designed by of Ralph Karsten of Atmasphere, a small St. Paul, Minnesota company. Ralph's contributions to discussions here at ASR under the handle "atmasphere" have been intelligent, courteous and...
  2. Xulonn

    Transistors challenge vacuum tubes - the beginning...

    I was 12 years old when the below film was produced, and four years away from assembling my first component HiFi system, the heart of which was a Bell Sound Model 2300, a 6L6 push-pull mono amplifier. My nostalgia for the electronics of my youth is manifested by having a quad of EL34's and a...
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