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Have you replaced the selenium rectifiers and checked all the filter caps? Although I haven't personally had trouble with those huge seleniums in the CT-100/21CT55, I know they're capable of trouble like you're having. Fairly simple power supply. However, it might be a benefit to have that ultra-slow warmup... I think most failures of other parts happen on startup surge; when the B+ is highest (in solid state rectified sets like this), and the tube filaments are still cold and the power supply is running hog-wild unloaded. Come to think of it, maybe let it be, as long as it isn't a slow-forming filter cap which may be pulling a ton of current. An AC ammeter would check that too.
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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