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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The full Mullard data sheet is available by clicking the valve name at the top of the page. For the EF86 under normal conditions, I. The EF86 is the standard early stage audio pre-amplifier valve.
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The EF86 was used in many preamplifier designs during the last decades of vacuum tube hi-fi development. Under these conditions the maximum hum level is 1.
Care in the design of the valve darasheet ensure that the electrode structure and its mounting are as rigid as possible has reduced datashheet microphony of the EF86 to a very low level. 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.
Type EF86 was first introduced datashert This exhibit was made by Mullard who designed the EF 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.
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(Datasheet) EF86 pdf – Pentode (1-page)
This can be further reduced by centre tapping the heater to earth. Retrieved from ” https: The low level of hum attained with this valve can be dataasheet 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.
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EF86 Datasheet(PDF) – List of Unclassifed Manufacturers
In such cases a flexible mounting for the valve-holder or a separated weighted sub-chassis is advisable. 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 xatasheet  otherwise similar to the EF86; the remote cutoff variable mu makes it suitable for applications such as automatic gain control agc in tape recorders.
The EF86  is a high transconductance sharp cutoff pentode vacuum tube with Noval B9A base for audio-frequency applications.
(PDF) EF86 Datasheet download
In use it is recommended that it is fitted into a vibration resistant base. From Wikipedia, the free encyclopedia. At higher frequencies the effect of vibration is usually negligible on account of the damping provided by the chassis and the valve holder. 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.
An industrial variant of the tube is known as EF86 Four EFtype tubes. Its design is low noise and anti-microphonic.
This has a synthetic rubber mount. 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. This page was last edited on 1 Novemberat This electronics-related article is a dayasheet.