The '''EL34''' is a thermionic [[vacuum tube]] of the power [[pentode]] type,. firstThe madeEL34 was introduced in 19491955 by [[Mullard]], who were owned by [[Philips]].<ref>Editors (Jun 1955). [https://worldradiohistory.com/UK/Wireless-World/50s/Wireless-World-1955-06-S-OCR.pdf Physical Society's Exhibition.] ''Wireless World''. p. 277 - 278. Retrieved 18 Aug. 2022.</ref> The ItEL34 has an international [[Tube socket|octal]] base (indicated by the '3' in the part number) and is found mainly in the final output stages of [[sound|audio]] amplification circuits; it was also designed to be suitable as a series regulator by virtue of its high permissible voltage between heater and cathode and other parameters. The American [[RETMA tube designation]] number for this tube is '''6CA7'''. The USSR analog was 6P27S (Cyrillic: 6П27C).
==Specifications==
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[[File:Svetlana EL34 tubes.jpg|thumb|left|Matched EL34 vacuum tubes by Russian manufacturer Svetlana]]
The EL34 was introduced in 1949 by [[Philips]],While the parentEL34 company of [[Mullard]]. Althoughis no longer made by themPhilips, it is currently manufactured by EkspoPUL in Saratov, Russia ([[Electro-Harmonix]], [[Tung-Sol]], [[Mullard]] and [[Genalex Gold Lion]] brands), [[JJ Electronic]] in Čadca, Slovakia and by [[Changsha Hengyang Electronics Company|Hengyang Electronics]]<ref>Classic Series EL34C,{{cite web |url=http://www.psvane.com/hifixl/459.html |title=Changsha Hengyang Electronics Co., Ltd.}}</ref><ref>Classic (Hi-Fi) Series EL34, {{cite web |url=http://www.psvane.com/en/hifiseries/312.html |title=Changsha Hengyang Electronics Co., Ltd.}}</ref> at former Foshan Nanhai Guiguang Electron Tube Factory in southern China, (Psvane and TAD<ref>Sales Network, {{cite web |url=http://www.psvane.com/en/salesnetwork.html |title= Changsha Hengyang Electronics Co., Ltd.}}</ref> brands).
Some firms make a related tube called an E34L which is rated to require a higher [[grid bias]] voltage, but which may be interchangeable in some equipment.
