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 EF86 is the standard early stage audio pre-amplifier valve. This exhibit was made by Mullard who designed the EF It was first shown at the Radio Show and first used in their amplifier from Its design is low noise and anti-microphonic.
(Datasheet) EF86 pdf – Pentode (1-page)
In use it is recommended that it is fitted into a vibration resistant base. This has a synthetic rubber mount. 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. 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.
EF86 Datasheet PDF
This can be further reduced by centre tapping the heater to earth. Under these conditions the maximum hum level is 1.
The low level of hum attained with this valve can be sf86 masked by that due to an unsuitable valve-holder, in which excessive leakage and capacitive coupling between pins will introduce considerable hum. 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. Care in the design of the valve to ddatasheet that the electrode structure and its mounting are as rigid as possible has reduced the microphony of the EF86 to a very low level.
At higher frequencies the effect of vibration is usually negligible on account of the damping provided by the chassis and the valve holder. 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. In such cases a flexible mounting for the valve-holder or a separated weighted sub-chassis is advisable.
The UF86 is identical with the exception of a The full Mullard data sheet is available by clicking the valve name at the top of the page.
Warning the PDF file is 3. Type EF86 was first introduced in