Tesla 131QP50 picture tube

Picture tube with high brightness and short afterglow for television film scanners. The picture tube created a pure white raster that was projected on a film frame. The light beam would scan the frame one line after another and the intensity of the passed light would be detected with a photomultiplier. This process ran at the speed of 25 frames per second. That's why the short afterglow was so important. High brightness was provided thanks to very high anode voltage, approx. 25 kV, while ordinary black-and-white picture tubes used 10 to 16 kV. Because of such a high anode voltage, this picture tube created a substantial amount of X-ray radiation.