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You can also build a continuity tester with something like a couple of C batteries, and a radio pilot lamp, like a #44-the bulb should light if the filament is intact. We only keep yammering on with this filament thing as it is very, very rare for a crt filament to blow-usually everything else in the picture tube goes bad before the filament fails.
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Than why is the Sencore not powering the filament? I think when the Sencore does Tube tests it powers up the filament, it has done that on every set i've tested.. It's not the Sencore, because i went and tested another set i have to make sure..