How Can You Measure the Heater Voltage of a Crt Tube
Open Circuit In Heater (Filament) Of CRT Tube
After so many CRT Monitors sent in for repair, i could say that i only came across one unit of a 14″ Acer Monitor that had an open winding in the filament (heater). The complaint was no display but have loftier voltage and i found that the heater was present merely there was no glow in the filament. Checking the filament with an ohmmeter revealed that in fact the filament already had an open up circuit internally. This is very uncommon and normally the filament is quite robust.
Do you know that our filament could take well-nigh 10 to xi volt? A normal tube is using 6.3 volt dc and by increasing the heater voltage one can bring back a tube to life simply again it depends on how severe is the tube. I had done an experiment before many years ago where i deliberately increase the heater voltage to meet what voltage the filament could withstand. I tested it by using my adjustable power suppl. Increasing the voltage upwardly to 11 volt seems to exist still okay simply when i set to 12 volt dc, the filament immediately break.
Now, if you lot ever come across whatsoever tube that have dim display and yous have confirmed that the tube already weak then modify a circuit that can simply become up to 10 volt. 11 volt could be marginal and the best is from eight to ten volt. 12 volt will surely burn upwardly the filament. If you take the time and a bad tube (winding shorted and etc) then you tin exercise the experiment yourself and see how is the upshot. You will run across that the filament will glow extra bright before information technology burn out.
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Source: https://jestineyong.com/open-crt-tube-heater-winding/
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