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While I don't have Sams #105, I do have the Rider TV books and this TV is in Volume #4 pages 22-44.
According to the schematic, all the tube filaments run in parallel. As you said, one side goes to ground. In all the tubes the other side goes straight to the "green" wire on the power transformer.
In your schematic the "x" may simply refer to this "green" wire on the transformer. Check the schematic and see if there is a wire labeled "x" coming from the transformer. Sometimes they use this short cut to reduce the number of lines on the schematic.
If there is no voltage at the filament pins, check for a cold solder joint or a broken wire. Thought not probable, make sure the tubes are good.
Good luck.
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