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  2. GNR Class C1 (large boiler) - Wikipedia

    en.wikipedia.org/wiki/GNR_Class_C1_(large_boiler)

    The Great Northern Railway (GNR) Class C1 is a type of 4-4-2 steam locomotive. One, ex GNR 251 (later LNER 3251 in 1924, and LNER 2800 in 1946), survives in preservation. Much like their small boiler cousins, they were capable of reaching speeds of up to 90 mph (145 km/h). [2] [3] They were also known as Large Atlantics. [4] [5]

  3. Constant-voltage speaker system - Wikipedia

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

    Constant-voltage speaker systems are also commonly referred to as 25-, 70-, 70.7-, 100 or 210-volt speaker systems; distributed speaker systems; or high-impedance speaker systems. In Canada and the US, they are most commonly referred to as 70-volt speakers. In Europe, the 100 V system is the most widespread, with amplifier and speaker products ...

  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. They also manufactured other tube and solid ...

  5. Audio power amplifier - Wikipedia

    en.wikipedia.org/wiki/Audio_power_amplifier

    Audio stereo power amplifier made by McIntosh The internal view of a Mission Cyrus One hi-fi integrated audio amplifier (1984) [1]. An audio power amplifier (or power amp) amplifies low-power electronic audio signals, such as the signal from a radio receiver or an electric guitar pickup, to a level that is high enough for driving loudspeakers or headphones.

  6. SWR Sound Corporation - Wikipedia

    en.wikipedia.org/wiki/SWR_Sound_Corporation

    The company was founded as SWR Engineering, Inc. by its namesake, Steve W. Rabe. Rabe was known for his engineering work at Acoustic Control Corporation.After extensive research with top Los Angeles studio bassists, SWR released its first commercial product in 1984, the PB-200 hybrid tube/solid-state bass guitar amplifier.

  7. Loudspeaker - Wikipedia

    en.wikipedia.org/wiki/Loudspeaker

    A loudspeaker (commonly referred to as a speaker or, more fully, a speaker system) is a combination of one or more speaker drivers, an enclosure, and electrical connections (possibly including a crossover network). The speaker driver is an electroacoustic transducer [1]: 597 that converts an electrical audio signal into a corresponding sound. [2]

  8. List of railway electrification systems - Wikipedia

    en.wikipedia.org/wiki/List_of_railway...

    This is a list of the power supply systems that are, or have been, used for railway electrification. Note that the voltages are nominal and vary depending on load and distance from the substation. As of 2023 [update] many trams and trains use on-board solid-state electronics to convert these supplies to run three-phase AC traction motors.

  9. Fender Concert - Wikipedia

    en.wikipedia.org/wiki/Fender_Concert

    The speaker configuration remained 4-10" speakers usually made by either Jensen or Oxford (for the earlier models) as opposed to Utah or CTS (for the later models). The Concert joined the Fender Twin Amp , and Fender Vibrasonic as the only models with the more robust and expensive "large-iron" output transformers.