The EZ35 is a standard 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.
An effective series resistance of 350 Ohms was required to limit surges and the reservoir capacitor had to be restricted to 16 µF. The wide glass tube envelope is approximately 30 mm in diameter and, excluding the IO base pins, is 77 mm tin height. Type EZ35 was first introduced in 1946. Today, the 6X5 finds use in many hifi pre-amplifiers.