Why does the driver tube glow so RED

sydney

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Why does the tube glow so bright. Is the tube bad or some other component. Driver tube NoS Tungsol 5687
 

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Dev.R

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Probably a Red Plate. The tube may be drawing excessive current . The Tube should be a faulty one.
Had a similar issue with my 6550 . In the end replaced the tube and back to normal.
 
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