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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. Valve Amplification Company - Wikipedia

   en.wikipedia.org/wiki/Valve_Amplification_Company

   It is well known for having produced the Marantz Classic series of amplifiers for Marantz Japan from 1996 to 1998 (Marantz Model 7 / 7C, Model 8B, Model 9), as well as the VAC-designed Model 66 integrated amplifier. In addition, it redeveloped and produced the first 200 recreations of the LA-2A leveling amplifier for Universal Audio in 1998.

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.

5. Full-range speaker - Wikipedia

   en.wikipedia.org/wiki/Full-range_speaker

   A large number of full-range drive units are used in commercial sound systems, which may employ a number of 200 mm (8") full-range drivers, mounted into suspended ceilings or small 'back-box' enclosures. These convey background music and announcements to workers and visitors in retail stores, and public spaces. While these drivers are classed ...

6. 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 ...

7. List of vacuum tubes - Wikipedia

   en.wikipedia.org/wiki/List_of_vacuum_tubes

   1R5/DK91 – Pentagrid converter, anode voltage in the 45...90 volt range. 1S4 – Power output pentode Class-A amplifier, anode voltage in the 45...90 volt range. 1S5 – Sharp-cutoff pentode Class-A amplifier, and diode, used as detector and first A.F. stage in battery radio receivers. Anode voltage in the 67...90 volt range.