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The R12 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.

The coated cathode tube can clearly been seen and the filament wires pass inside this very small cathode tube. The anode is bright Nickel.

The thin glass tube envelope is 14 mm in diameter and, excluding the base wires is 53 mm tip to tip.

References: Data-sheet & ¹⁰⁴⁰. Type R12 was first introduced in 1952. See also 1952 adverts.

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.