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The EZ80 full wave rectifier was found in many broadcast receivers and domestic audio equipment.

Suited to the task, at 90 mA maximum current and with a required series resistance of 300 Ω to reduce the initial surge in charging the maximum 50 µF reservoir capacitor, each anode would conduct in turn when connected to either end of a grounded centre tapped mains transformer.

The EZ81 is pin compatible but rated at 160 mA.

This Brimar valve is an import but carries the pejorative term Foreign. The general UK perception at the time was that British was best. The makers knew that manufacturing costs were lower outside the UK.

The thin glass tube envelope is 21 mm in diameter and, excluding the B9A base pins, is 59 mm tall.

References: Data-sheet & ¹⁰⁴⁰. Type EZ80 was first introduced in 1954. See also 1954 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.