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

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. Type EF86 was first introduced in This exhibit was made by Mullard who designed the EF The UF86 is identical with the exception of a Vacuum tubes Guitar amplification tubes Electronics stubs.

EF86 Four EFtype tubes. In use it is recommended that it is wf86 into a vibration resistant base. You can help Wikipedia by expanding it. 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 Datasheett voltage amplifier, particularly in the early stages of high gain audio amplifiers, microphone pre-amplifiers and magnetic tape recorders.

EF86 – Wikipedia

By using this site, you agree to the Terms of Use and Privacy Policy. Views Read Edit View history. This page was last edited on 1 Novemberat Warning the PDF file is 3. 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.


This can be further reduced by centre tapping the heater to earth. An industrial variant of the tube is known as 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.

This electronics-related article is a stub. Under these conditions the maximum hum level is 1.

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. Articles containing potentially dated statements from All articles containing potentially dated statements All stub articles. Its design is low noise and anti-microphonic. 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.

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

Tube Tester Files – 6J33P (EF86)

The EF86 is the standard early stage audio pre-amplifier valve. This has a synthetic rubber mount. For the EF86 under normal conditions, I. The EF86 [1] is a high transconductance sharp cutoff pentode vacuum tube with Noval B9A base for audio-frequency applications. Retrieved from ” https: The full Mullard data sheet is available by clicking the valve name at the top of the page. 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.


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The EF86 was used in many preamplifier designs during the last decades of vacuum tube hi-fi development. It was first shown at the Radio Ff86 and first used in their amplifier from The low-frequency noise generated by a valve is most conveniently specified as an equivalent voltage on the control grid for a specific bandwidth.

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 dataseet the same chassis. In such cases a flexible mounting for the valve-holder or a separated weighted sub-chassis is advisable.