Abstract: The stereophonic system of the invention comprises two tweeters (12, 13) fixed to the front panel, and a low-frequency loudspeaker (4) fixed to an enclosure (6) inside the back of the cabinet. It is thus possible to use a large low-frequency loudspeaker.

Abstract: Television set fascia comprises mechanism for centering the tube which are arranged at the four corners of the screen. These mechanisms aer composed essentially of two symmetrical elastic tabs. The retention of the tube is ensured by retaining ribs.

Abstract: The actuator for a change-over switch fixing device disclosed has a hollow guiding body in which there moves a transmission body actuated by a button and actuating the rod of a change-over switch. The contact surfaces between the movable body and the guiding body are far longer than they are wide.

Abstract: To mount a television set demagnetization loop, parts with hooks are used, mounted so as to be free in rotation on the heads of the cathode-ray tube fastening screws.

Abstract: A printed circuit board in a television set casing is repaired without the connectors of this board getting shifted with respect to the holes of the rear cover, and without this board being damaged when the television set undergoes shocks or falls. The board is placed in a U-shaped strap, the arms of which are clipped on to the cover with the strap having L-shaped lugs which are simply pushed into holes of the casing, thus forming a hinged link between the board and the casing.

Abstract: The socket of the invention is provided with tappets that are snapped into slots made in partition walls perpendicular to the fixing front. To adjust the clearances, elastic surfaces are formed on the forward face.

Abstract: To fasten metallic or plastic covers or panels to supporting surfaces, snapping-in lugs are formed on these covers. These lugs are inserted into the slots of the supporting surface.

Abstract: The wave barrier device of the invention comprises a flap which is rigidly joined to the soldering machine. This flap plunges lightly into the molten tin bath and pushes it before the board which is precedes.

Abstract: A convergence adjustment device for color video-projectors having three monochrome tubes, each projecting an image of a give color on a screen. This device acts on the scanning of the second and third tubes for superimposing, on the screen, their images on that of the first tube. This device is of the digital type. It comprises a RAM in which correction values are stored corresponding to correction of the scanning currents for the different zones into which the image is divided. These values are restored in synchronism with the scanning of the zones during normal operation. The device also comprises a microprocessor for modifying, during the adjustment phase, the stored values as a function of the ordes issued by the user who makes this adjustment by observing the image. The user's actions in a manual mode affect only a single one of the zones. In an automatic mode, adjustments are effective on groups of zones.

Abstract: A geometry adjustment device for a color video projector having three monochrome tubes each projecting an image of a given color on a screen, comprising a geometry correction circuit adjustable by the user for providing, by acting on a single signal, vertical amplitude, vertical linearity and horizontal trapezoid corrections of the images projected on the screen by the tubes.