EMI 4.5 inch Image Orthicon tube type 9565
In 1964 a new "Elcon" target material* was announced. This offered a much improved tube life and almost complete freedom from the "sticking" problem of earlier tubes. These "Elcon" tubes have an "E" suffixed to the type type number and sometimes an E sticker on the tube base spigot.
In the UK 4.5 inch tubes were made by:- EMI, EEV,
* from "ELectronic CONducting" properties of the target material.