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Just to note so everyone doesnt think were too crazy here....the crt is kinda like a 5U4, The filament is the cathode so they use an isolation transformer much like you would to save a crt with a heater to cathode short. The isolation transformer is driven by the flyback.
I have a feeling this is one of those deals where they crt never goes bad or is always the problem. No way to test it.
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