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.

Author: Kigor Akikazahn
Country: Comoros
Language: English (Spanish)
Genre: Medical
Published (Last): 9 May 2007
Pages: 370
PDF File Size: 20.23 Mb
ePub File Size: 5.15 Mb
ISBN: 888-2-49575-828-4
Downloads: 33584
Price: Free* [*Free Regsitration Required]
Uploader: Grodal

Views Read Edit View history. The low-frequency noise generated by a valve is most conveniently specified as an equivalent voltage on the control grid for a specific bandwidth. By datasheeet this site, you agree to the Terms of Use and Privacy Policy. The EF86 is the standard early stage audio pre-amplifier valve.

Under these conditions the maximum hum level is 1. The EF86 was used in many preamplifier designs during the last decades of vacuum tube hi-fi development. Type EF86 was first introduced in The UF86 is identical with the exception of a 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.

This page was last edited on 1 Novemberat Its design is low noise and anti-microphonic. 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 dqtasheet level. It was first shown at the Radio Show and first used in their amplifier from 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.


The full Mullard data sheet is available by clicking the valve name at the top of the page.

This has a synthetic rubber mount. This exhibit was made by Mullard who designed the EF EF86 Four EFtype tubes.

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 eg86 audio amplifiers, microphone pre-amplifiers and magnetic tape recorders.

TDSL Tube data [EF86]

This can be further reduced by centre tapping the heater to earth. The EF86 [1] is a high transconductance sharp cutoff pentode vacuum tube with Noval B9A base for audio-frequency applications. In use it is recommended that it is fitted into a vibration resistant base. An industrial datwsheet of the tube is known as In other projects Wikimedia Commons.

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


EF86 Datasheet

From Wikipedia, the free encyclopedia. Warning the PDF file is 3. Vacuum tubes Guitar amplification tubes Electronics stubs. This electronics-related article is a stub. In such cases a dafasheet mounting for the valve-holder or a separated weighted sub-chassis is advisable. Retrieved from ” https: For the EF86 under normal conditions, I.

Articles containing potentially dated statements from All articles containing potentially dated statements All stub articles. You can help Wikipedia by expanding it.

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.

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 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. 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.