EF86 | |
---|---|
Classification | Pentode |
Service | Audio frequency |
Cathode | |
Cathode type | Indirectly heated |
Filament voltage: | 6.3 V RMS or dc |
Filament current | 200 mA |
Anode | |
Max dissipation Watts | 1 W |
Max current | 6 mA |
Socket connections | |
B9A | |
Typical class-A amplifier operation | |
Amplification factor | 185 (45dB) |
Screen voltage | 200 V |
The EF86[1] 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 [2] 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, with low noise and low microphony claimed advantages, although a rubber-mounted vibration-resistant base was still recommended.[2] It has a 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 tube variant is known as 6267. In the former Soviet Union a variant was also produced as type 6Zh32P (Russian: 6Ж32П.) As of 2012[update] EF86s were being produced in Russia in two versions under the Electro-Harmonix brand and in the Slovak Republic as JJ Electronic (formerly Tesla).