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If you are talking about the tube in the third picture. That tube has lost its vacuum and is completely useless and needs to be replaced. Although the brown ring around the white splotch is somewhat unusual it most likely is not a burn mark. The white splotch should be a nice,silvery color not milky white.
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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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