Abstract: An electrical arrangement, which may, for example be a magnetron, has a sealed chamber and electrically insulating fluid contained within the chamber. A temperature expansion compensation bladder comprising a helical tube is located within the chamber, the helical tube having an end open to ambient atmosphere outside the chamber, and having a closed end within the chamber.

Abstract: An electrical arrangement, which may, for example be a magnetron, has a sealed chamber 12 and electrically insulating fluid contained within the chamber. A temperature expansion compensation bladder comprising a helical tube 13 is located within the chamber 12, the helical tube 13 having an end 15 open to ambient atmosphere outside the chamber 12 and having a closed end 14 within the chamber.

Abstract: An electron beam tube device has a magnetic frame with the top part being pivotable so as to pivot from a closed position in which the top part, including an electromagnetic coil covers the electron beam tube to an open position in which the electron beam tube is uncovered. This allows electron beam tubes with either large parts or integral parts such as output feeders to be removed from the magnetic frame without complete removal of the top plate.

Abstract: An electron beam tube (17) having a longitudinal axis comprises a first component, such as a ceramic wall (5) and a second component such as a drift tube assembly having a mounting plate (3). The tube further comprises means, such as member (18), arranged to allow relative sliding movement of the first component relative to the second component in a radial direction. The invention helps to alleviate mechanical stresses caused by differential thermal expansion of the components.

Abstract: In an electron beam tube such as a klystron, a vacuum seal comprises a ceramic cylindrical wall on which are brazed metal rings which are welded to flares and fixed to electrodes and of a collector. Ceramic rings and are located between the metal ring and the electrodes. The cylindrical wall includes inner flanges which overlap the inner peripheries of the metal rings hence reducing the likelihood of arcing occurring between them and other parts of the arrangement at different potentials. In other embodiments of the invention, the ceramic rings are extended to shield the inner edges of the metal rings or a separate ceramic tube is positioned within the metal rings to provided shielding.