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i took a brightener that a set needed and put a resistor on it , the thing sent 10 volts to the crt , after the resistor 7 volts and that little extra is just enough to make a bright picture and better contrast , so thats an idea for others , this way you aren't constantly overdriving it and get a usefull picture out of it , if its too far gone then yes it will need more voltage.
i have seen rare cases where using a brightner for a hour or so after it is removed the picture is better then it was before and stays that way except for a slow time when the set is turned on but rarely does it stay that way.
mike
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