Abstract: A band selector for a klystron includes a cam carrier and a plurality of cam followers. The cam carrier includes a plurality of cams with the cams being arranged in a plurality of rows. Each of the cam followers has a first end adapted to be mounted to a respective one of the plungers in the klystron and a second end. The cam carrier is positionable so that a selected one of the rows aligns with the cam followers. The cam followers are normally biased so that the second end of the cam followers abuts a respective one of the cams. The band selector further includes a first member movable between a first position and a second position. When the first member is in the first position, it is non-interactive with the cam followers. When the first member is moved to its second position, it becomes engageable with the first end of each of the cam followers to remove the second end of the cam followers from abutment with the respective one of the cams.

Abstract: A heat sink element, preferably one formed with a relatively large surface area from which thermal energy can be transferred convectively and radiatively to an ambient atmosphere, with or without forced fluid flow, is held forcibly in contact with a heat transmitting surface of a heat source for thermal conduction of heat therefrom. A heat sink attachment element affixed to the heat sink element has flexibly attached castellated extensions formed with tapered end teeth contacting a correspondingly inclined surface of the heat source. The castellated extensions are each subjected to a continual externally applied force and the total resultant force thereof, holding the heat sink element to the heat source, thereby can be maintained or will increase as the assembly experiences thermal cycling and mechanical disturbances during use. The effectiveness of thermally conductive contact between the heat sink and heat source therefore does not deteriorate during prolonged use.