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I would feed it so it gets sync. Some sets blank or go blue
without H sync. And remember it tests one gun at a time.
If you are SURE its the CRT try this. There is a low ohm resistor
usually 1 or 2 ohms 1 or 2 watts in series with the filament. You
can jump it out & get more time out of it. There is some RISK doing
that !
Zeno
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