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The sets you have been posting here all use parallel string filiments. If the tube lights the filiment is ok. If they were series string sets with no power transformer you would need to check each tube since a burnt out filiment will cause the entire string of tubes not to light. Series string color consoles are indeed rare. If you want to check with a multimeter, you need the tube base diagram to identify the filiment pins. Then you can check for continuity between those pins.
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