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Some sets made around the Korean war had changes to the tube line up and other weirdness to account for shortages. Check the base wiring of that tube against the schematic...if it matches that of the tube of the schematic but not the one in the set then the schematic is right, but if it is significantly different from the schematic it may be a production change not documented on the schematic you have.
Other weird things they did included using odd looking German resistors and or American made factory rejects where the marked value was wrong but the measured value was right...
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