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I tried resoldering the filament pins, and they still test open. At some point (probably after swapping in the known good tube) I may completely remove the socket and test directly to the wires. For now, it's just no go. The socket is a bit loose, and I tried wiggling it, but no success.
Both this 21FJ and the replacement 21FB are marked Zenith, but have RCA EIA codes (274)
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