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The EZ81 was introduced by Mullard as a high current B9A rectifier, the low power rectifier offered by Mullard was the 90 mA EZ80. Prior to the EZ81 Mullard designs used the GZ34.

In use the maximum reservoir capacitor would be limited to 50 µF and to prevent damage by excess current an effective series resistance of 230 Ohms is used.

The thin glass tube envelope is 19 mm in diameter and, excluding the B9A base pins, is 70 mm tall.

References: Data-sheet, ³⁰⁰² & ¹⁰⁴⁰. Type EZ81 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.