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- Die Elektronenröhre EF86 ist eine Kleinsignalpentode mit geringem Rauschen und wird auch heute noch in Audioröhrenverstärkern eingesetzt. Die Röhre wurde 1954 von dem deutschen Röhrenhersteller Valvo – einem Tochterunternehmen des niederländischen Konzerns Philips – entwickelt. Sie ist der Nachfolgetyp der EF40 und hat einen Noval-Sockel. (de)
- The EF86 is a high transconductance sharp cutoff pentode vacuum tube with Noval (B9A) base for audio-frequency applications. It was introduced by the Mullard company in 1953 and was produced by Philips, Mullard, Telefunken, Valvo, and GEC among others. It is very similar electrically to the octal base EF37A and the Rimlock base EF40. Unlike many pentodes it was designed specifically for audio applications, low noise and low microphony being claimed advantages, although a rubber-mounted vibration-resistant base was still recommended. It has much higher stage gain than any triode, which makes it susceptible to microphony. The EF86 was used in many preamplifier designs during the last decades of vacuum tube hi-fi development. An industrial variant of the tube is known as 6267. In the former Soviet Union a variant was also produced as type 6Zh32P (Russian: 6Ж32П.) As of 2012 EF86s were being produced in Russia in two versions under the Electro-Harmonix brand and in the Slovak Republic as JJ Electronic (formerly Tesla). (en)
- EF86 es un pentodo de bajo ruido destinado a amplificación de audio de muy bajo nivel en equipos amplificadores para reproducción. (es)
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- Four EF86-type tubes (en)
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- Die Elektronenröhre EF86 ist eine Kleinsignalpentode mit geringem Rauschen und wird auch heute noch in Audioröhrenverstärkern eingesetzt. Die Röhre wurde 1954 von dem deutschen Röhrenhersteller Valvo – einem Tochterunternehmen des niederländischen Konzerns Philips – entwickelt. Sie ist der Nachfolgetyp der EF40 und hat einen Noval-Sockel. (de)
- EF86 es un pentodo de bajo ruido destinado a amplificación de audio de muy bajo nivel en equipos amplificadores para reproducción. (es)
- The EF86 is a high transconductance sharp cutoff pentode vacuum tube with Noval (B9A) base for audio-frequency applications. It was introduced by the Mullard company in 1953 and was produced by Philips, Mullard, Telefunken, Valvo, and GEC among others. It is very similar electrically to the octal base EF37A and the Rimlock base EF40. Unlike many pentodes it was designed specifically for audio applications, low noise and low microphony being claimed advantages, although a rubber-mounted vibration-resistant base was still recommended. It has much higher stage gain than any triode, which makes it susceptible to microphony. The EF86 was used in many preamplifier designs during the last decades of vacuum tube hi-fi development. An industrial variant of the tube is known as 6267. In the former (en)
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- EF86 (de)
- EF86 (es)
- EF86 (en)
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