Sensibly equivalent¶ to:
The U147 is a full wave HT rectifier for low power AC mains driven equipment. The output of a centre tapped transformer would be applied to the anodes, the rating given is 325-0-325, the common cathode would be the output for the rectified voltage. A effective series resistance of 350 Ohms was required to limit surges and the reservoir capacitor had to be restricted to 16 µF. The valve has two anodes stacked vertically on a common cathode tube.
See 6X5GT for details as this is a near equivalent.
The wide glass tube envelope is 29 mm in diameter and excluding the IO base pins the valve is 77 mm tall.
Reference: 3002. Type U147 was first introduced in 1950. See also 1950 adverts.
Absolute Maximum Operating Conditions¶
Updated January 05, 2022.