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I think there are a couple of wires swapped for the Predicta tubes, to prevent the filaments from coming on if somebody puts a 2.7 volt tube in a 6.3 volt TV, or from installing a 6.3 volt tube in a Predicta. If you don't have the right socket, you can check the schematics of the Predicta and any other TV with that size socket but standard filaments, and temporarily swap the wires.
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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