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.

 
Absolute Maximum Operating Conditions

Rectifier	Vh	Ah
	6.3	0.09

Thanks to Frank Philipse for supplying the above datasheet

This exhibit was last updated on 10 June 2007 {find valves by name}