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Sensibly equivalent to:
6X2 CV426 R12 SU61 U151 U43
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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 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.
Looking into the bell anode the cathode can be seen with the oxide coating starting a little way from the end of the tube. The insulated heater can just be seen.
The thin glass tube envelope is 14 mm in diameter and, excluding the base wires is 55 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.
Updated February 21, 2022.
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