I am not an expert but would venture a guess that either the bias or heater voltage is way out of specification, otherwise the tube would not be glowing as you describe.
Any chance the bias is set wrong? Do you know how to check for this?
Depending on circuit design, it's also possible a resistor is burned and allowing the bias to run wild. Hopefully someone here at Audiogon with the technical expertise on this topic will advise you.
In the meantime, I would avoid putting new tubes in the offending socket, they may be damaged beyond repair.
Any chance the bias is set wrong? Do you know how to check for this?
Depending on circuit design, it's also possible a resistor is burned and allowing the bias to run wild. Hopefully someone here at Audiogon with the technical expertise on this topic will advise you.
In the meantime, I would avoid putting new tubes in the offending socket, they may be damaged beyond repair.