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I would vacseal the funnel weld and the face plate weld. Although I'm not sure what the thermal expansion ratio of the vacseal would be and wether it would stay solid while the glass and metal contracts and expands possibly causing micro fractures in the glass sections. I do think Phil vacsealed his 15gp and as far as I know it's holding up well.
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Admiral C322C2 Regent (Restoring)
RCA CTC-7 Pensbury (Restored)
RCA CTC-5 Westcott (Restored)
CRA CTC--4 Director 21 (Restoring)
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