The EF80 internally screened pentode was a workhorse of the VHF TV receiver and was introduced in 1950. The Z152 is the M-OV Type designation for the design. Set makers needed continuity of supply and so the design was shared among manufacturers.
Through the screen can be seen the strap the connects the two halves of the anode.
Here the grids can be seen. The suppressor clearer on the left is an open helix. The inner grids pass flat across the rectangular cathode.
The thin glass tube envelope is 20 mm diameter and excluding the B9A base pins, is 58 mm tall.
References: Data-sheet & 1040 Type Z152 was first introduced in 1950. See also1950 adverts.
