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The UY85 half wave rectifier was designed for use in heater chains connected directly across the European mains, as the 100 mA heater suggests. The reservoir capacitor specified is 100 µF and the minimum effective series resistance in the circuit needed to be only 100 Ohms.

This valve has the Philips logo on the envelope in yellow ink. The full logo can be seen here.

The anode plates are folded outwards at the ends to maintain the area but to fit the glass tube. The inner face of the anode is bright as only the outer surface is required to radiate.

The two halves of the anode are stitched together.

The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 58 mm tall.

References: Data-sheet & ¹⁰⁴⁰. Type UY85 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.