Abstract: In a photomultiplier tube, antimony layers of a photocathode and a plurality of dynodes are simultaneously sensitized by exposure to the vapors of sodium and potassium at an initial temperature of less than about 120.degree. C. The temperature of exposure is gradually increased at a rate of less than about 10.degree. C. per minute until a final temperature of about 200.degree. C. is reached. Then, the photocathode and dynodes are baked at the final temperature until substantially maximum photosensitivity is achieved. The photocathode and dynodes are thereafter exposed to cesium and may be superficially oxidized until substantially maximum photosensitivity is achieved.

Abstract: Electron discharge device including a channel plate electron multiplier provided on its output face with a conducting layer of which substantially annular endspoiling segments extend a distance into the channels. The ends of the endspoiling segments are slanted in the same direction, and to at least the same degree of magnitude, as are the channels themselves with respect to the output face.