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The standard Mullard naming convention would name this UHF pentode as EF180, but for special quality valves, such as this, the numbers are presented after the indication of the heater. E = 6.3 volts.

Mullard describe the E180F as a high-slope RF pentode primarily intended for use in wideband amplifiers in telephone carrier systems, radar equipment and measuring equipment.

It can be seen that in this miniature envelope is an even smaller valve, this very small size helps to reduce inter electrode capacitances and thereby raises the maximum usable frequency that the device can operate at.

These valves would be used for the front end amplification stage of high quality receivers up to the UHF region of the spectrum.

The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 38 mm tall.

References: Data-sheet & ¹⁰⁴⁰. Type E180F was first introduced in 1955. See also 1955 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.