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Seleniums get weak (increased forward voltage drop) with age. Does your symptom seem to be thermal in nature? If you use a fan or cooling spray to keep the seleniums cool, does the set work OK?
Seleniums were often used in a voltage doubler arrangement, and the 2 capacitors in the doubler can also cause problems if they get leaky or lose capacity as they warm up.
Replacing both the rectifiers and the doubler caps is the real fix.
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