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Why dontcha try this:
With the set off, remove the tube. Working from the top side of the chassis, stick the meter from ground into lug 5. It should show zero ohms, indicating solid continuity thru the socket to ground.
Do the same thing to lug 4. It should show nearly zero, a small fraction of an ohm (from the paralleled tube heaters and heater winding, to ground).
If you get an open on either lug, that'll show you which track to pursue to find the open condition.
I suspect this fault is why the project was abandoned.
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