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Follow the brown filament wires back to the chassis. You might have a poor solder connection. It’s also not out of the realm of possibility that the crt cabling connector could be bad. Zenith also used a rectangular fuse called a bell fuse. But I can’t remember if one was used for the filament voltage line or not.
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Sony Trinitron is my favorite brand.
My wish list:
Sony KV-7010U
Sony KV-1220U
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