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The Type 81 is a half wave power rectifier. The anode voltage given is the RMS value. Two units are required for a full wave rectifier.

Side view of the anode box. The location pip for the bayonet base is on the right.

The ceramic top insulator with twin filament tension springs.

The classic envelope is 51 mm in diameter, and excluding the UX4 base pins is 118 mm tall.

References: Data-sheet. Type 81 was first introduced in 1927. See also 1927 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.