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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 ohms 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. The older EZ40 has the same rating as the EZ80 and is on a B8A base.

This exhibit says it was British Made, the same wording as the EZ40, but EZ80 with the same older style Mullard logo has the later wording of Made in Great Britain.

The anodes are identical, one pointing up the envelope and the other at right angles pointing down. Maximum radiating area and minimum required space.

The thin glass tube envelope is 20 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.