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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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EF86 Datasheet PDF

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. The full Mullard data sheet is available by clicking the valve name at the top of the page. From Wikipedia, the free encyclopedia. In such cases a flexible mounting for the valve-holder or a separated weighted sub-chassis ec86 advisable.

(PDF) EF86 Datasheet download

In other projects Wikimedia Commons. This page was last edited on 1 Novemberat Warning the PDF file is 3. 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 ff86 low level.

Vacuum tubes Guitar amplification tubes Electronics stubs. For the EF86 under normal conditions, I. This electronics-related article is a stub. By using this site, you agree to the Terms of Use and Privacy Policy.


The EF86 [1] is a high transconductance sharp cutoff pentode vacuum tube with Noval B9A base for audio-frequency applications. Articles containing potentially dated statements from All articles containing potentially dated statements All stub articles.

EF86 @ The Valve Museum

The EF86 was used in many preamplifier designs during the last decades of vacuum datashest hi-fi development. EF86 Four EFtype tubes. 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.

At higher frequencies the effect of vibration is usually negligible on account of the damping provided by the chassis and the valve holder.

EF86 – Wikipedia

You can help Wikipedia by expanding it. 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 audio amplifiers, microphone pre-amplifiers and magnetic tape recorders.

The low-frequency dwtasheet generated by a valve datazheet most conveniently specified as an equivalent voltage on the control grid for a specific bandwidth. The rarely used EF83 is a remote-cutoff pentode [4] otherwise similar to the EF86; the remote cutoff variable mu makes it suitable for applications such as automatic gain control agc in tape recorders.


Unlike many pentodes it was designed specifically for audio applications, datashee noise and low microphony being claimed advantages, although a rubber-mounted vibration-resistant base was still recommended.

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.

Type EF86 was first introduced in This exhibit was made by Mullard who designed the EF Views Read Edit View history. Its design is low noise and anti-microphonic. The EF86 is the standard early stage audio pre-amplifier valve.

An industrial dataeheet of the tube is known as It was first shown at the Radio Show and first used in their amplifier from 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. Retrieved from ” https: The UF86 is identical with the exception of a