Quote:
Originally Posted by mr_fixer
the cr70 manual said that if the needle didn't drop by 25% when the life test button was depressed that it would be good for 12 months or more. I guess YMMV. the odd thing was there were no sparks or flashes in the crt neck like others have said occurs.
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The auto-restore mode in a CR-70 will not cause a spark or flash. It is not the same as a basic rejuvinate like in the Beltron where a capacitor is charged up with several hundred volts and dischanged through the CRT cathode. THe idea is to blow off some of the cathode surface and expose fresh material. Problem is that there is only so much coating on the cathode. It's possible to zap off too much and be left with a dead CRT.
The auto restore mode cycles the filament hotter than usual to burn off contaminants. Three cycles is recommended and ideally you see the cathode current increase with each cycle.