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  2. Williamson amplifier - Wikipedia

    en.wikipedia.org/wiki/Williamson_amplifier

    Output power and maximum distortion: 15 W RMS at no more than 0.1% THD; [58] Intermodulation: not specified (Williamson did not have the necessary test equipment); [58] Frequency range: 10-20000 Hz at ±0.2 dB; 3-60000 Hz at ±3 dB; [58] Phase shift within 10-20000 Hz: "never exceeds a few degrees" at the extremes of audio spectrum; [58]

  3. Valve amplifier - Wikipedia

    en.wikipedia.org/wiki/Valve_amplifier

    6N3C power tube. 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.

  4. Randall Amplifiers - Wikipedia

    en.wikipedia.org/wiki/Randall_Amplifiers

    In the early 2000s, the company worked with Bruce Egnater of Egnater Amplification to create the MTS (Modular Tube System) series of guitar amplifiers. These involve a single amp head consisting of the power amp and part of a preamp, and slots in the head (one for the RM20 head and combo, two for the RM50 head and combo and RM22 head, and 3 for the RM100 head and RM100C combo, and 12 for the ...

  5. Battery charger - Wikipedia

    en.wikipedia.org/wiki/Battery_charger

    A battery charger, recharger, or simply charger, [1] [2] is a device that stores energy in an electric battery by running current through it. The charging protocol—how much voltage and current, for how long and what to do when charging is complete—depends on the size and type of the battery being charged.

  6. Output transformerless - Wikipedia

    en.wikipedia.org/wiki/Output_transformerless

    Output transformerless (OTL) is a type of vacuum tube audio power amplifier, which omits an output transformer for the purpose of greater linearity and fidelity. Conventional vacuum tube amplifier designs rely upon an output transformer to couple the amplifier's output stage to the loudspeaker.

  7. 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.

  8. Amplifier - Wikipedia

    en.wikipedia.org/wiki/Amplifier

    The first practical version of such devices was the Audion triode, invented in 1906 by Lee De Forest, [8] [9] [10] which led to the first amplifiers around 1912. [11] Since the only previous device which was widely used to strengthen a signal was the relay used in telegraph systems, the amplifying vacuum tube was first called an electron relay.

  9. 807 (vacuum tube) - Wikipedia

    en.wikipedia.org/wiki/807_(vacuum_tube)

    The 6П7С (6P7S) is similar to Г-807, but with an 8-pin octal base. The 807 also found some use as a horizontal output tube in early TV receivers, particularly those manufactured by DuMont . The 807 design (with some " value engineering " to reduce production cost) was the basis for the first application-specific horizontal sweep tubes such ...

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