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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. 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.

  4. Dynaco - Wikipedia

    en.wikipedia.org/wiki/Dynaco

    Dynaco was an American hi-fi audio system manufacturer popular in the 1960s and 1970s for its wide range of affordable, yet high quality audio components. [1] Founded by David Hafler and Ed Laurent in Philadelphia, Pennsylvania in 1955, it's best known product was the ST-70 tube stereo amplifier.

  5. 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.

  6. Fisher Electronics - Wikipedia

    en.wikipedia.org/wiki/Fisher_Electronics

    Fisher Allegro Model X19 Tube 20 watt stereo amplifier and matching FM Multiplex Tuner, c. 1962 Fisher Marketing Brochure and Component Price List circa 1964 Fisher Custom Electra Console – 1967 – Model E-492-W – 21-R Solid State Chassis – 45 Watts – Made in US – Turn Table: Dual 1010 (W. Germany).

  7. List of valve amplifier designs - Wikipedia

    en.wikipedia.org/wiki/List_of_valve_amplifier...

    LEAK TL/12 Point One Amplifier. The first commercially produced amplifier with distortion of 0.1% was the LEAK Type 15 "Point One" of 1945, using KT66 vacuum tubes (valves) connected as triodes, with 26 dB feedback over 4 stages including the output transformer. In 1948 LEAK produced the TL/12 which was also rated at 0.1% but featured improved ...

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