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  2. 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.

  3. 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.

  4. Eico - Wikipedia

    en.wikipedia.org/wiki/Eico

    The model EICO HF-81 integrated tube amplifier is just one of several highly regarded products manufactured by EICO during this period. [6] EICO is also known for "monoblock" amplifiers such as the HF-50 and HF-35, stereo integrated amplifiers such as the ST-40 and ST-70, as well as many other amplifiers and preamplifiers.

  5. Manley Laboratories - Wikipedia

    en.wikipedia.org/wiki/Manley_Laboratories

    In 1983, the first Vacuum Tube Logic (VTL) tube power amplifiers and preamplifiers went into full-fledged production in the UK for the European market. David, joined by his son Luke introduced the amplifiers to the US market at the 1986 Consumer Electronics Show , where the positive reception convinced them to expand their distribution to the US.

  6. AOL Mail - AOL Help

    help.aol.com/products/aol-webmail

    Get answers to your AOL Mail, login, Desktop Gold, AOL app, password and subscription questions. Find the support options to contact customer care by email, chat, or phone number.

  7. 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 ...

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