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  2. 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 ...

  3. Talk:Constant-voltage speaker system - Wikipedia

    en.wikipedia.org/wiki/Talk:Constant-voltage...

    For example, in 1967, Crown International introduced the DC300 amplifier, which is capable of directly driving 70-volt lines, as well as traditional speaker loads, thanks to its overall power [1] of 500W. [2] In 1987, Crown introduced the Macrotech 2400, capable of driving 100-volt lines directly. [3]

  4. EL84 - Wikipedia

    en.wikipedia.org/wiki/EL84

    250 V a 250 V g2 I a = 48 mA R k = 135 Ω: 170 V a 170 V g2 I a = 70 mA-12.5 V g1: Maximum Output Power (single-ended Class A) 5.7 W @10% THD into 5200 Ω, 250 V supply, 4.3 V RMS input 5.3 W @10% THD into 2500 Ω, 200 V supply, 7.0 V RMS input Maximum Output Power (2 tubes, push-pull Class AB) 17 W @4% THD into 4+4 kΩ, 300 V supply, 10 V RMS ...

  5. List of LM-series integrated circuits - Wikipedia

    en.wikipedia.org/wiki/List_of_LM-series...

    Power op-amp with a maximal current output of 3 amperes [23] LM709 Yes General-purpose op-amp [24] LM741 LM709 General-purpose op-amp. [25] Widely used. LM747: Yes General-purpose dual op-amp. [26] LM748 General-purpose op-amp with external compensation [27] LM833 Dual high-speed audio operational amplifiers [28] LM837 Low-noise quadruple op ...

  6. EL34 - Wikipedia

    en.wikipedia.org/wiki/EL34

    The EL34 is a thermionic vacuum tube of the power pentode type. The EL34 was introduced in 1955 by Mullard, who were owned by Philips. [1] The EL34 has an octal base (indicated by the '3' in the part number) and is found mainly in the final output stages of audio amplification circuits; it was also designed to be suitable as a series regulator by virtue of its high permissible voltage between ...

  7. Philips Launches Latest Innovations in Industry Leading ... - AOL

    www.aol.com/2012/10/25/philips-launches-latest...

    Philips Launches Latest Innovations in Industry Leading Portfolio of LED Retrofit Lamps Philips DimTone BR30 LED, 100 Watt Equivalent and LED T8 replicate light quality of the light sources they ...

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