Stereo Timeline

  • THomas Alva Edison

    THomas Alva Edison
    Thomas Alva Edison, working in his lab, succeeds in recovering Mary's Little Lamb from a strip of tinfoil wrapped around a spinning cylinder with the stereo.
  • Electric motor-driven phonograph.

    Electric motor-driven phonograph.
    Edison introduces an electric motor-driven phonograph.
  • Steros Famous

    Steros are becoming big.
  • Telegraphone,

    Valdemar Poulsen patents his "Telegraphone," recording magnetically on steel wire
  • Vacuum Tube

    Vacuum Tube
    Lee DeForest invents the triode vacuum tube, the first electronic signal amplifier.
  • Radio Practical

    Radio Practical
    Major Edwin F. Armstrong is issued a patent for a regenerative circuit, making radio reception practical.
  • A.C Recording

    Independently, engineers in Germany, Japan and the U.S. discover and develop AC biasing for magnetic recording.
    Western Electric designs the first motional feedback, vertical-cut disk recording head.
    Major Armstrong, the inventor of FM radio, makes the first experimental FM broadcast.
    The first of many attempts is made to define a standard for the VU meter.
  • Poetable Recorder

    The Audio Engineering Society (AES) is formed in New York City.
    The microgroove 33-1/3 rpm long-play vinyl record (LP) is introduced by Columbia Records.
    Scotch types 111 and 112 acetate-base tapes are introduced.
    Magnecord introduces its PT-6, the first tape recorder in portable cases.