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  2. YouTube's Ms. Rachel takes on first words and potty training ...

    www.aol.com/youtubes-ms-rachel-takes-first...

    Parents and caregivers can now find Ms. Rachel's new books, "100 First Words," "My First Coloring Book" and "Potty Time with Bean," wherever books are sold. Extended interview: Jamie Dimon Jamie ...

  3. Tube sound - Wikipedia

    en.wikipedia.org/wiki/Tube_sound

    Tube sound (or valve sound) is the characteristic sound associated with a vacuum tube amplifier (valve amplifier in British English), a vacuum tube-based audio amplifier. [1] At first, the concept of tube sound did not exist, because practically all electronic amplification of audio signals was done with vacuum tubes and other comparable ...

  4. Valve amplifier - Wikipedia

    en.wikipedia.org/wiki/Valve_amplifier

    A valve amplifier or tube amplifier is a type of electronic amplifier that uses vacuum tubes to increase the amplitude or power of a signal. Low to medium power valve amplifiers for frequencies below the microwaves were largely replaced by solid state amplifiers in the 1960s and 1970s.

  5. Klystron - Wikipedia

    en.wikipedia.org/wiki/Klystron

    The simplest klystron tube is the two-cavity klystron. In this tube there are two microwave cavity resonators, the "catcher" and the "buncher". When used as an amplifier, the weak microwave signal to be amplified is applied to the buncher cavity through a coaxial cable or waveguide, and the amplified signal is extracted from the catcher cavity.

  6. Valve audio amplifier - Wikipedia

    en.wikipedia.org/wiki/Valve_audio_amplifier

    A valve audio amplifier or vacuum tube audio amplifier is a valve amplifier used for sound reinforcement, sound recording and reproduction. Until the invention of solid state devices such as the transistor , all electronic amplification was produced by valve (tube) amplifiers.

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  8. YouTube Kids - Wikipedia

    en.wikipedia.org/wiki/YouTube_Kids

    YouTube Kids has faced criticism from advocacy groups, particularly the Fairplay Organization, for concerns surrounding the app's use of commercial advertising, as well as algorithmic suggestions of videos that may be inappropriate for the app's target audience, as the app has been associated with a controversy surrounding disturbing or violent ...

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