Abstract: In a pick-up unit, a tube base for a camera tube is integrated with a coil former having a system of coils. As a result, the length of the pickup unit is small so that it is possible to manufacture portable cameras of small dimensions. The radial position of the tube with respect to the coil former is fixed by centering means provided in the tube base and in a sealing cap engaging the coil former. The axial position of the tube relative to the coil former is fixed by urging the tube against an abutting face of the sealing cap by means of a spring. The coil former is surrounded by a .mu.-metal screening sleeve consisting of two portions. The two portions of the screening sleeve are coupled together by means of a clamping ring.

Abstract: An electromagnetic device for magnetically focusing and deflecting an electron beam in a television camera tube comprising a vertical deflection coil, a horizontal deflection coil, a ferromagnetic coil and focusing coil. Electrostatic screens are respectively provided on the inner side of the vertical deflection coil and the outer side of the horizontal deflection coil. In order to prevent or substantially reduce interference signals in the focusing coil from the vertical and horizontal deflection coils, which interference is visible in a signal from a camera tube, the focusing coil comprises multifilar windings having the same winding direction and sense. The windings are connected in series such that the magnetic fields produced by each winding are of the same polarity.