Mullard XQ1410B plumbicon camera tube

This tube measures 214x34mm overall; the window is 22mm across. It has an 8 pin base with one fat pin as the key.

This tube was used in the Marconi Mk IX camera, which used three tubes. This specimen is the Blue tube. Heater rating is 6.3V/300mA, it has a resolution of greater than 750 lines, and a cut-off of 650nm.