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Second the variac motion, bypass the time delay tube but keep in mind the relay may not pull in on the reduced voltage. The bigger problems I recall were with the CRT anode supply and weak HV transformer that was prone to shorting out, a real pest in the 545s as well.
A word of caution: use only a silver bearing solder on the porcelain terminal strips, I've damaged many in my time using standard 60/40 solder
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