# 6DJ8

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{{Short description|Model of double triode vacuum tube}}
thumb|right|220px|ECC88, 6922, 6DJ8 and 6N23P
The '''6DJ8''' is a miniature nine-pin medium-gain dual-[triode](/source/triode) [vacuum tube](/source/vacuum_tube). It is distinguished by its very high [transconductance](/source/transconductance), mostly the result of its frame grid construction. Versions of the tube are named ECC88, E88CC, 6922, E188CC, CV4108, 7308, 6N1P and 6N23P.

== Origins == 
right|thumb|A Philips JAN 6922 made in the USA
The tube was developed by [Philips](/source/Philips) in the Netherlands under European designation ECC88. The series-string version 7DJ8 / PCC88 was also introduced at the same time. The 6DJ8 was designed for use as a low-noise amplifier in [VHF](/source/VHF) and [UHF](/source/UHF) TV tuners, an improved successor to the usual 6BK7, but due to its high gain it was heavily used in high-end test equipment, for example, most high-quality oscilloscopes from the 1950s to the 1960s utilize a number of 6DJ8 tubes.

== Audio ==
right|thumb|Two 6922s used in a headphone amp
Although not originally designed for the purpose, it became popular in [hi-fi](/source/hi-fi) audio amplifiers. European-produced version of the tube is designated '''ECC88'''. An industrial (improved/higher ratings) version of the tube was designated 6922 / E88CC between 1959 and 1961. Siemens introduced their own super ECC88 / 6DJ8 at the same time under CCa type. New Old Stock (NOS) 6DJ8s and ECC88s produced in the past by major American or West European vacuum tube manufacturers (such as [Philips](/source/Philips) or [Amperex](/source/Amperex)) remain extremely popular with and highly sought by [audiophiles](/source/audiophiles). A version (direct equivalent) of this tube was also produced in the Soviet Union as 6N23P (Russian: 6Н23П).

{{As of|2015}} the tube was being produced in three versions in Eastern Europe - [Slovakia](/source/Slovakia) by JJ Electronic ([ex-Tesla](/source/Tesla_(Czechoslovak_company))), and in Russia: 6DJ8 for [Sovtek](/source/Sovtek) and 6922 for [Electro-Harmonix](/source/Electro-Harmonix).

== See also ==
*[6N23P](/source/6N23P) (Direct equivalent)
*[6N1P](/source/6N1P) (Not a direct equivalent)
*[6N3P](/source/6N3P) (Not a direct equivalent)
*[List of vacuum tubes](/source/List_of_vacuum_tubes)

== References ==
[http://tdsl.duncanamps.com/show.php?des=6DJ8] - 6DJ8 tube data at DuncanAmps.

==External links==
* [https://tubemaze.info/tag/6dj7-ecc88/ Reviews of 6DJ8/ECC88 tubes.]

Category:Vacuum tubes

[ru:Двойные триоды](/source/ru%3A%D0%94%D0%B2%D0%BE%D0%B9%D0%BD%D1%8B%D0%B5_%D1%82%D1%80%D0%B8%D0%BE%D0%B4%D1%8B)

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Adapted from the Wikipedia article [6DJ8](https://en.wikipedia.org/wiki/6DJ8) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/6DJ8?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.