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The EF98 amplifier pentode from Mullard was designed for IF amplifier use in VHF car radios. It is special in that it is designed to have the anode operating directly at vehicle battery potential. The normal operating conditions were for an anode voltage of six volts.

The maximum cathode current is given as 14 mA but in use as an IF amplifier the anode current would be around 0.6 mA and the screen current set to about 0.2 mA.

See also EBF83, ECC86 and ECH83.

The thin glass tube envelope is 17 mm in diameter and, excluding the B7G base pins, is 47 mm tall.

References: Data-sheet, ³⁰⁰² & ¹⁰⁴⁰. Type EF98 was first introduced in 1957. See also 1957 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.