|
Hi All;
VTS1134, Emission is the ammount of electrons that are boiled off of the filament/Cathode of the tube, Whether it be a regular tube or a CRT.. We see it as light as in a light bulb or an orange glow in a normal tube/CRT.. Without emissions there is no transfer of electrons and the tube would be what we call dead.. In a CRT the combination of the various grids after that, aim and control the ammount of electron getting to the Phospher screen.. When no electrons the screen is blank and some electrons show a small dot and many electrons show a larger or brighter dot.. The larger or brighter dot is also controlled by one of the gride and also by the focusing coils.. When you have it focused correctly the dot is small and round.. Otherwise it is large and may or may not be round.. One fo the grids is the control grid, which as its name implies, controls the ammount of electrons getting to the screen.. So even if the filament/cathode is emitting electrons, if the control grid is at cut-off then no electrons will reach the screen, and if turned on a little some will get to the screen.. Like turning on the water faucet, as long as there is pressure from the main water pumping station, when the faucet is turned off we get no water, there is plently of water pressure, but it is cut -off.. As we open the faucet, we get some to alot of water depending on how much we have opened it.. Does this clarify your question ?? If, not please ask, what you are confused about..
THANK YOU Marty
|