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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 technical specification - Wikipedia

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

    The basic gain stage for a valve amplifier is the auto-biased common cathode stage, in which an anode resistor, the valve, and a cathode resistor form a potential divider across the supply rails. The resistance of the valve varies as a function of the voltage on the grid, relative to the voltage on the cathode.

  4. 6V6 - Wikipedia

    en.wikipedia.org/wiki/6V6

    The pentode EL84/6BQ5 - 9 pin Noval base tube, that although different enough from the 6V6 not to justify rating it as an equivalent, because of its popularity and ready availability, plus having a close-enough similarity to make it possible, if bias is altered, adapters have been developed commercially to allow an amplifier designed for 6V6 ...

  5. Valve RF amplifier - Wikipedia

    en.wikipedia.org/wiki/Valve_RF_amplifier

    A valve RF amplifier (UK and Aus.) or tube amplifier is a device for electrically amplifying the power of an electrical radio frequency signal. Low to medium power valve amplifiers for frequencies below the microwaves were largely replaced by solid state amplifiers during the 1960s and 1970s, initially for receivers and low power stages of ...

  6. Fender Harvard - Wikipedia

    en.wikipedia.org/wiki/Fender_Harvard

    The amplifier had a very simple circuit and used only a single channel with a two-stage preamp, with just a volume and (treble-cut) tone control. The Harvard was a fixed bias amplifier, using a basic cathodyne phase inverter, but did include a selenium rectifier in the bias circuit. The 5F10 was discontinued in 1961.

  7. Operational amplifier - Wikipedia

    en.wikipedia.org/wiki/Operational_amplifier

    A basic circuit is designed, ... vacuum tube op amps became commercially available with the release of the model K2-W from George A. Philbrick Researches ...

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  9. Williamson amplifier - Wikipedia

    en.wikipedia.org/wiki/Williamson_amplifier

    The Williamson amplifier is a four-stage, ... Tube complement, 1947 ... V2A and V2B) and fourth (output, V3 and V4) stages follow Cocking's Quality Amplifier circuit ...

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