given as a guide only – please refer to original manufacturers data sheets to ensure that a substitute is safe and appropriate for your application. EF86 Ratings. Characteristics of a bogey tube: Electrical. Heater Voltage (AC or DC) in Volts. +/ Heater Current in mA. +/- 10%. Heating. Indirect. Page 1. Page 2. Page 3. Page 4. Page 5. Page 6. Page 7. Page 8.

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Type EF86 was first introduced in The rarely used EF83 is a remote-cutoff pentode [4] otherwise similar to the EF86; the remote datsheet variable mu makes it suitable for applications such as automatic gain control agc in tape recorders. Warning the PDF file is 3.

At higher frequencies the effect of vibration is usually negligible on account of the damping provided by the chassis and the valve holder. Articles containing potentially dated statements from All articles containing potentially dated statements All stub articles.

Its design is low noise vatasheet anti-microphonic. It was first shown at the Radio Show and first used in their amplifier from Under these conditions the maximum hum level is 1. Vacuum tubes Guitar amplification tubes Electronics stubs. You can help Wikipedia by expanding it.

EF86 @ The Valve Museum

Care in the design of the valve to ensure that the electrode structure and its mounting are as rigid as possible has reduced the microphony of the EF86 to a very low level.


The landmark amplifier designs from Mullard’s application laboratories all specified the EF86, and today it is still the valve of choice for this work. In other projects Wikimedia Commons.

This has a synthetic rubber mount. This can be further reduced by centre tapping the heater to earth. Before the advent of the EF86 the Mullard valve of choice for pre-amplifier stages was the EF37A Mullard describe the EF86 as a low noise pentode intended for use as a RC coupled AF voltage amplifier, particularly in the early stages of high gain datasyeet amplifiers, microphone pre-amplifiers and magnetic tape recorders.

EF86 Datasheet PDF –

The EF86 was used in many preamplifier designs during the last decades of vacuum tube hi-fi development. This page was last edited on 1 Novemberat From Wikipedia, the free encyclopedia. Although used in circuits such as tape recorder input stages and instrument amplifiers, microphony can be a problem, even when mounted in a vibration-reducing valve holder. This exhibit was made by Mullard who designed the EF This electronics-related article is a stub.

In such cases a flexible mounting for the valve-holder or a separated weighted sub-chassis is advisable. The low-frequency noise generated by a valve is most conveniently specified as an equivalent voltage on the control grid for a specific bandwidth.

The EF86 [1] is a high transconductance sharp cutoff pentode vacuum tube with Noval B9A base for audio-frequency applications.


In high gain applications such as tape recording care should be taken in siting the valve, particularly when a loudspeaker is present in the same cabinet or where a motor is mounted on the same chassis. The full Mullard data sheet is available by clicking the valve name at the top of the page.

For the EF86 under normal conditions, I. Views Read Edit View history. The low level of hum attained with this valve can be completely masked by that due to an unsuitable valve-holder, in which excessive leakage and capacitive coupling between pins will introduce considerable hum.

(PDF) EF86 Datasheet download

Unlike many pentodes it was designed specifically for audio applications, low noise and low microphony being claimed advantages, although a rubber-mounted vibration-resistant e86 was still recommended. By using this site, you agree to the Terms of Use and Privacy Policy. In use it is recommended that it is fitted into a vibration resistant base.

Retrieved from ” https: EF86 Four EFtype tubes. An industrial variant of the tube is known as The EF86 is the standard early stage audio pre-amplifier valve. The UF86 is identical with the exception of a