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The biggest problem with many picture tubes is the loss of emission or electron production due to contaminated or damaged cathode that surrounds the heater. The 7JP4 was used in the following sets (incomplete list): Motorola VT-71 Motorola VT-73 Hallicrafters 504, 505, T-54 Sentinel TV-400 Sentinel TV-405 National TV-7W Philco 50-T701 & 50-T702
A CRT in a TV is commonly called a picture tube. CRTs have also been used as memory devices , in which case the screen is not intended to be visible to an observer. The term cathode ray was used to describe electron beams when they were first discovered, before it was understood that what was emitted from the cathode was a beam of electrons.
RCA eventually solved the problem of displaying the color images with their introduction of the shadow mask. The shadow mask consists of a thin sheet of aluminum with tiny holes photo etched into it, placed just behind the front surface of the picture tube. Three guns, arranged in a triangle, were all aimed at the holes.
[10]), the tube produced the extremely bright picture which was projected via a Schmidt lens and mirror assembly onto a semi translucent screen of typically 22.5 to 30 inches diagonal in size using an optical system practically identical to the earlier Philips system described above. The only change was that RCA used the optically superior ...
RCA eventually solved the problem of displaying the color images with their introduction of the shadow mask. The shadow mask consists of a thin sheet of steel with tiny holes photo etched into it, placed just behind the front surface of the picture tube. Three guns, arranged in a triangle, were all aimed at the holes.
Overscan is a behaviour in certain television sets in which part of the input picture is cut off by the visible bounds of the screen. It exists because cathode-ray tube (CRT) television sets from the 1930s to the early 2000s were highly variable in how the video image was positioned within the borders of the screen. It then became common ...
The four-tube television camera, intended for color television studio use, was first developed by RCA in the early 1960s. [1] [2]: 96 In this camera, in addition to the usual complement of three tubes for the red, green and blue images, a fourth tube was included to provide luminance (black and white) detail of a scene.
A simulated example of severe ghosting in an analog TV broadcast. In television, a ghost is a replica of the transmitted image, offset in position, that is superimposed on top of the main image. It is often caused when a TV signal travels by two different paths to a receiving antenna, with a slight difference in timing. [1]