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The best way to check that is to remove the horiz output tube and observe the CRT neck, to check the status of the heaters of each gun.
If the CRT went to air, all three heaters would be burnt out.
In some cases where the CRT has gone to air, the heaters still have continuity but will not glow because thery're immersed in a heat-conductive fluid (air). But the whole neck gets real hot real quick due to heat conduction.
07-01-2018, 11:26 PM
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