Abstract: An image pick-up tube assembly, including an image pick-up tube having a target provided in the front portion thereof, a coil assembly surrounding the image pick-up tube, a cylindrical shield case housing the image pick-up tube and the coil assembly, and front and rear shield caps covering the front and rear openings of the shield case. The front shield cap is mounted to the shield case such that both horizontal and vertical contact planes are formed therebetween to significantly reduce the influence of the earth's magnetism on the assembly so that a three tube type television camera employing three such assemblies is effected much less by direction dependent color deviation.