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  2. Allen B. DuMont - Wikipedia

    en.wikipedia.org/wiki/Allen_B._DuMont

    By 1928, DuMont was searching for new opportunities and was wooed by Dr. Lee de Forest, a radio pioneer who developed the audion tube, the original voice amplifier for radio reception. De Forest had had a checkered career as an inventor and several failed business ventures.

  3. Circlotron - Wikipedia

    en.wikipedia.org/wiki/Circlotron

    A U.S. patent for a circlotron High Fidelity Audio Amplifier was filed by Alpha Wiggins of Electro-Voice on March 1, 1954, and granted March 28, 1958. [1] However, other inventors filed the same concept earlier: [2] C. T. Hall filed Parallel Opposed Power Amplifiers on June 7, 1951; U.S. Patent 2,705,265 was granted on March 29, 1955.

  4. Electro-Voice - Wikipedia

    en.wikipedia.org/wiki/Electro-Voice

    Electro-Voice RE-27N/D microphone. In 1963, EV received an Academy Award for their 642 Cardiline shotgun microphone, the first ever given for an audio product. [7] Electro-Voice launched its RE Series of microphones in the 1960s, notably the RE15, which was used extensively by musicians on television shows.

  5. Mesa/Boogie - Wikipedia

    en.wikipedia.org/wiki/Mesa/Boogie

    Mesa/Boogie (also known as Mesa Engineering) is an American company in Petaluma, California, that manufactures amplifiers and other accessories for guitars and basses. It has been in operation since 1969. Mesa was started by Randall Smith as a small repair shop which modified Fender amplifiers, particularly the diminutive Fender Princeton ...

  6. Compressed air gramophone - Wikipedia

    en.wikipedia.org/wiki/Compressed_air_gramophone

    A pneumatic amplifier was realised by using a sensitive valve, which required little force to operate, to modulate the flow of a stream of compressed air.The basic principle of the valves used in these devices was to pass the stream of compressed air through two partially overlapping combs.

  7. Why Bill Gates Is Telling All About Life Before His Billions ...

    www.aol.com/why-bill-gates-telling-life...

    Microsoft founder Bill Gates is telling his “origin story” in his own words with the memoir Source Code, being released on Feb. 4 "My parents and early friends put me in a position to have a ...