Abstract: A helix-type delay line borne by a conical surface. The internal surface of a sleeve has grooves into which are inserted dielectric supports of constant height that are affixed to the helix-type delay line, and the depth of the grooves increases with the diameter of the line.

Abstract: The collector of an electronic power tube is surrounded by a ceramic sleeve and a heat-sink. Between these three parts two resilient assemblies, are placed respectively one having anchorage points on the collector and the ceramic sleeve, and the other having anchorage points on the ceramic sleeve and the heat-sink. The two assemblies are formed from pieces able to be deformed both in the cross-sectional planes and along the axis of the system.

Abstract: The present invention relates to a method for the manufacture of a hyperfrequency delay line. The method comprises using a single metal wire shaped by the coiling thereof, said operation comprising bringing the wire into the form of contiguous coils. Coiling is followed by a wire cambering operation during which the coils are deformed at regular intervals in the axis of the line by using wedges, in such a way that the line is formed by a succession of identical groups of three coils in which the first and third coils have identical but oppositely directed inclinations with respect to the axis and in which half of the second coil remains contiguous with the first coil and half remains contiguous with the third coil. Application to the manufacture of double helix delay lines, of ring and bar and ring and loop lines, used in travelling wave tubes functioning as amplifiers.