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

At higher frequencies the effect of vibration is usually negligible on account of the damping provided by the chassis and the valve holder. You can help Wikipedia by expanding it. The full Mullard data sheet is available by clicking the valve name at the top of the page. 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 wf86 very low level.

This can be further reduced by centre tapping the heater to earth. Vacuum tubes Guitar amplification tubes Electronics stubs.

EF86 Datasheet

The EF86 e8f6 used in many preamplifier designs during the last decades of vacuum tube hi-fi development. 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 low-frequency noise ef6 by a valve is most conveniently specified as an equivalent voltage on the control grid for a specific bandwidth.


EF86 Four EFtype tubes.

(Datasheet) EF86 pdf – Pentode (1-page)

Its design is low noise and anti-microphonic. Warning the Ff86 file is 3. In such cases a flexible mounting for the valve-holder or a separated weighted sub-chassis is advisable. In use it is recommended that it is fitted into a vibration resistant base. This exhibit was made by Mullard who designed the EF Under these conditions the maximum hum level is 1. This has a synthetic rubber mount. This electronics-related article is a stub. Type EF86 was first introduced in For the EF86 darasheet normal conditions, I.

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It was first shown at the Radio Show and first used in their amplifier from This page was last edited on 1 Novemberat The UF86 is identical with the exception of a The rarely used EF83 is a remote-cutoff pentode [4] otherwise similar to datashet EF86; the remote cutoff variable mu makes it suitable for applications such as automatic gain control agc datashret tape recorders.

The EF86 [1] is a high transconductance sharp cutoff pentode vacuum tube with Noval B9A base for audio-frequency applications. Retrieved from ” https: By using this site, you agree to the Terms of Use and Privacy Policy. 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. Unlike many pentodes it was designed specifically for audio ff86, low noise and low microphony being claimed advantages, although a rubber-mounted vibration-resistant base was still recommended.


Articles containing potentially dated statements from All articles containing potentially dated statements All dataseet articles.

From Wikipedia, the free encyclopedia. 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. Views Read Edit View history.

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 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 EF86 is the standard early stage audio pre-amplifier valve. An industrial variant of the tube is known as