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The EY51 is a high voltage rectifier for use in television and similar EHT circuits. The cathode is cylindrical and placed within the bell of the anode cavity.

The valve is branded Philips and Made in Great Britain - in other words made in a Mullard plant.

The valve is designed for pulsed operation. The anode PIV is 17 kV and the rectified current has a maximum average value of 350 µA and a peak value of 80 mA. The reservoir capacitor can take a maximum value of 5,000 pF.

Here the oxide coated cathode can be seen in the centre of the anode bell. The well insulated heater wires form a hairpin within the cathode tube.

The thin glass tube envelope is 13 mm in diameter and, excluding the base wires is 53 mm tip to tip.

References: Data-sheet & ¹⁰⁴⁰. Type EY51 was first introduced in 1948. See also 1948 adverts.

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.