The results of an attempt to scale down a high-velocity scanning tube of the Super-Emitron type, without loss of sensitivity, is described.The pick-up tube so constructed has a performance superior to that of its predecessor and is about two or three times more sensitive. The superiority is due to increased mosaic storage, which reduces the shading signal but increases the picture lag. This is unnoticeable, except for very rapidly moving objects. The tonal gradation of the picture which the tube produces is satisfactory when viewed on modern cathode-ray tubes.