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What is a raster and how is it produced on the picture tube screen?
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What is the meaning of the word raster?
The word raster means lines on a television set that creates a picture. Raster is what makes up a television picture by projecting through the tube on the television set.
What are the old tv's with the big back on them?
Those were picture-tube TVs. The picture tube was almost as long as the TV screen was wide.
If the screen go's black but has a straight line of light going across screen middle of screen is this the picture tube that is bad?
Yes, it is.
In colour picture tube shadow mask is used to?
To increase screen brigtness.
What is a raster device?
Common examples of raster devices are computer monitors (e.g. cathode ray tube, LCD). The term "raster device" means a device that is composed of discrete image samples or pixels.
Why does a high pitched sound come when the TV is put on?
The spot that draws the picture on the TV screen sweeps across the screen 15,750 times every second. At the same time, it's sweeping from top to bottom of the screen 60 times every second. In that way, it draws the picture as a stack of horizontal lines on the screen. The spot is the front end of a beam of electrons that shoot at the screen from the rear of the picture tube. It gets steered around by electromagnetic coils around the neck of the picture tube. The coils are driven by voltages produced in the electronics of the TV set. The high-pitched sound you hear is the 15.75 KHz alternating voltage that sweeps the beam side to side across the screen.
What is a raster circuit?
A raster is the trace of the electron beam in a TV tube that makes up the image. It starts at the top left of the screen, and draws a line to the right, then returns to the left, slightly lower and draws the next line. When the very bottom line has been drawn, the lelctron beam will return to the top and start again. This pattern is called a raster. A raster circuit generates a ramp voltage or current to deflect the beam inside the tube from left to right, with a very fast return to the left to start again. At the same time, a similar circuit generates a slower ramp to deflect the beam from the top to the bottom of the screen. Together, these two parts make a complete raster curcuit. This is a simplified explanation and a web search will produce results of more detailed explanations.
What is a vacuum tube in which a stream of electronics is focused on a phosphorescent screen in order to produce a image?
A stream of electrons is accelerated by several thousand volts, & focused on to a phosphorescent screen in a CRT (cathode ray tube) commonly known as a picture tube.
How much does a picture tube cost or a 73'' Mitsubishi big screen television?
Over $2200. dollars.
Explain why ion traps are used in picture tube with neat diagram about ion trap mechanism?
Ions left to travel to the screen of a picture tube would "burn" a brown spot where it would intefer with the picture viewing. They would usually make the electron path bent so that the ions would only strike in the neck portion of the tube. The electrons could easily be rerouted straight to the screen.
How much does a picture tube cost on a tv?
A replacement tube (if it is available) is likely going to cost almost as much as the whole television. If you need a new tube, it's time to ditch the tube TV and get a flat screen.
What is CRT in TV terms?
The CRT refers to cathode ray tube. This is the oldest of the varous TV types. More recent developments have been projection, plasma, etc.
