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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. Crown International - Wikipedia

   en.wikipedia.org/wiki/Crown_International

   By 1977, all of Crown's tape recorder products had been phased out. [2] In 1979, Crown introduced the PSA-2 & SA-2 power amplifiers with analog computer control of transistor performance to maximize output characteristics. [2] The FM-1 stereo radio tuner was praised at the Consumer Electronics Show. [2] In 1981, the FM-2 with digital tuning was ...

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...

   2.5 W audio power amplifier (fixed 34 dB gain) [43] LM383/LM2002 Yes 8 W audio power amplifier: LM384 5 W audio power amplifier (fixed 34 dB gain) [44] LM1875 20 W audio power amplifier (up to 90 dB gain) [45] LM1876 Dual 20 W audio power amplifier with Mute and Standby Modes (up to 90 dB gain) [46] LM386: Low voltage audio power amplifier [47 ...

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. List of vacuum tubes - Wikipedia

   en.wikipedia.org/wiki/List_of_vacuum_tubes

   4CX250B – 250 W Ceramic tetrode, forced-air cooled, version 'B', favored by radio amateurs as a final amplifier. 4CX250BC – 250 W Ceramic tetrode, forced-air cooled, version 'BC' 4CX35000 – Ceramic tetrode used in numerous 50-kW broadcast transmitters, forced-air cooled, often in a Doherty configuration as in the Continental Electronics ...