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The EF98/6ET6 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.

This exhibit was made by Philips in Holland.

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 mesh screen hides the inner structure.

The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 48 mm tall.

References: Data-sheet, ³⁰⁰² & ¹⁰⁴⁰. Type 6ET6 was first introduced in 1959. See also 1959 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.