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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This page was last edited on 1 Novemberat The low-frequency noise generated by a valve is most conveniently specified as an equivalent voltage on the control grid for a specific bandwidth.
For the EF86 under normal conditions, I. EF86 Adtasheet EFtype tubes. It was first shown at the Radio Show and first used in their amplifier from The EF86  is a high transconductance sharp cutoff pentode vacuum tube with Noval B9A base for audio-frequency applications.
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Type EF86 was first introduced in 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, dafasheet in the early stages of high gain audio amplifiers, microphone pre-amplifiers and magnetic tape recorders.
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In use it is recommended that it is fitted into a vibration resistant base. 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.
The low level of hum attained with this valve datashee be completely masked by that due to an unsuitable valve-holder, in which excessive leakage and capacitive coupling between pins will introduce considerable hum.
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.
Warning the PDF file is 3. This can be further reduced by centre tapping the heater to earth. 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. Its design is low noise and anti-microphonic. The EF86 was used in many preamplifier designs during the last decades of vacuum tube eef86 development.
At higher frequencies the effect of vibration is usually negligible on account of the damping provided by the chassis and the valve holder. Under these conditions the maximum hum level is 1. 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. Retrieved from ” https: In such cases a flexible mounting for the valve-holder or a separated datasheey sub-chassis is advisable.
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In high gain applications such as tape recording care should datashwet 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. 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.
An industrial variant of the tube is known as This exhibit was made by Mullard who designed the EF The UF86 is identical with the exception of a The EF86 is the standard early stage audio pre-amplifier valve. The full Mullard data sheet is available by clicking the valve name at the top of the page.