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Change any of those domino style mica or paper or maper or pica whatever they are if there in the horz circuit change them.
A glowing blue tube can be normal or can indicate excessive current. Its hard to tell without measuring the cathode current.
Im not a fan of working on the old sets either. Way to many caps and so easy to get a wrong value installed.
Im much more a fan of the 60s color stuff.
Check the HOT grid voltage and make sure its negative.
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