The GZ34 is an example of a typical high current rectifier for small equipment use. It is indirectly heated but the cathode is tied to one side of the heater.
The twin sections. The pressed anode is in the shape of a cross with asymmetric arm lengths.
The base contains the pressed glass foot that holds the lead-out wires.
The wide glass tube envelope is 32 mm in diameter and, excluding the IO base pins, is 69 mm tall.
References: Data-sheet & 1040. Type GZ34 was first introduced in 1954. See also1954 adverts.