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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Care in the design of the valve dxtasheet 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 low-frequency noise generated by a valve is most conveniently specified dataxheet an equivalent voltage on the control grid for a specific bandwidth. In other projects Wikimedia Commons. Retrieved from ” https: The EF86 was used in many preamplifier designs during the last decades of vacuum tube hi-fi development.
EF86 Datasheet PDF
From Wikipedia, the free encyclopedia. This has a synthetic rubber mount. The EF86 is the standard early stage audio pre-amplifier valve. Although used in circuits such as tape recorder input stages and instrument amplifiers, microphony can be a problem, even when mounted in a datwsheet valve holder.
Warning the PDF file is 3.
In use it is recommended that it is fitted into a vibration resistant base. In such cases a flexible mounting for the valve-holder or a separated weighted sub-chassis is advisable. Under these conditions the maximum hum level is 1.
This exhibit was made by Mullard who designed the EF Articles containing potentially dated statements from All articles containing potentially dated statements All stub articles. Unlike many pentodes it was designed daatasheet for audio applications, low noise and low microphony being claimed advantages, although a rubber-mounted vibration-resistant base was still recommended.
(PDF) EF86 Datasheet download
An industrial variant of the tube is known as Before the advent of the EF86 the Mullard valve of choice for pre-amplifier stages was the EF37A Mullard describe the Datashet 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 datashete for this work.
Views Read Edit View history. Its daatasheet is low noise and anti-microphonic. The rarely used EF83 is a remote-cutoff pentode  otherwise similar to the EF86; the remote cutoff variable mu makes it suitable for applications such as automatic gain control agc in tape recorders.
For the EF86 under normal conditions, I. The EF86  is a high transconductance sharp cutoff pentode vacuum tube with Noval B9A base for audio-frequency applications.
EF86 Datasheet(PDF) – List of Unclassifed Manufacturers
At higher frequencies the effect of vibration is usually negligible on account of the damping provided by the chassis and the valve holder. Vacuum tubes Guitar amplification tubes Electronics stubs. The full Mullard data sheet is available by clicking the valve name at the top of the page. It was first shown at the Radio Show and e8f6 used in their amplifier from The UF86 is identical with the exception of a In high gain applications such as tape recording care should be taken in siting datasheeet valve, particularly when a loudspeaker is present in the same cabinet or where a motor is mounted on the same chassis.
The low level of hum attained with this valve can be completely masked by that due datashewt an unsuitable valve-holder, in which excessive leakage and capacitive coupling between pins will introduce considerable hum.
Tube Tester Files – 6J33P (EF86)
This page was last edited on 1 Novemberat Type EF86 was first introduced in You can help Wikipedia by expanding it. EF86 Four EFtype tubes. This can be further reduced by centre tapping the heater to earth.