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Short of testing the tube the only way to find out if it works is to get the chassis working and see if it makes a picture.
First step would be to check for high voltage, since you have audio we can assume the basic power supply is working.
You can still check for HV at the 1V2 using the screwdriver method, you just have to hold it near the connection at the base of the 1V2 where the output of the Flyback connects.
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