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  2. Circlotron - Wikipedia

    en.wikipedia.org/wiki/Circlotron

    Circlotron valve amplifier is a type of power amplifier utilizing symmetrical cathode-coupled bridge layout of the output stage. Original circlotrons of 1950s used output transformers to couple relatively high output impedance of vacuum tubes to low-impedance loudspeakers.

  3. NAD 3020 - Wikipedia

    en.wikipedia.org/wiki/NAD_3020

    NAD 3020 integrated amplifier. The NAD 3020 is a stereo integrated amplifier by NAD Electronics, considered to be one of the most important components in the history of high fidelity audio. [1] Launched in 1978, this highly affordable product delivered a good quality sound, which acquired a reputation as an audiophile amplifier of exceptional ...

  4. Constant-voltage speaker system - Wikipedia

    en.wikipedia.org/wiki/Constant-voltage_speaker...

    High-voltage audio amplifiers have almost become a one chip solution. For example, National Semiconductor 's LME49810 [ 7 ] (and similar products LME49811 [ 8 ] and LME49830 [ 9 ] ) can output 100 V peak to peak signals, but have relatively low current output, so a standard circuit includes a Darlington or FET discrete output stage.

  5. The best smart speakers for seniors in 2023 - AOL

    www.aol.com/lifestyle/best-smart-home-speakers...

    Spatial audio: Spatial audio technology enhances the listening experience by creating a more immersive sound environment. This is particularly helpful for seniors with hearing impairments.

  6. Valve audio amplifier technical specification - Wikipedia

    en.wikipedia.org/wiki/Valve_audio_amplifier...

    The characteristics of valves as gain devices have direct implications for their use as audio amplifiers, notably that power amplifiers need output transformers (OPTs) to translate a high-output-impedance high-voltage low-current signal into a lower-voltage high-current signal needed to drive modern low-impedance loudspeakers (cf. transistors ...

  7. Radford Electronics - Wikipedia

    en.wikipedia.org/wiki/Radford_Electronics

    In 1961, the company released the STA range of amplifiers, accompanied by the DSM pre-amplifier. The Series 3 STA25, along with other Amplifiers in the STA range, won critical acclaim. As an expert in transformer design, Arthur Radford was able to reduce distortion by a factor of ten over the best performing amplifier of the day. The MK11 and ...

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