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Dan:
Check the B+ for 260 or so. If it is way down, suspect electrolytics; particularly the input cap in series with the AC and rectifiers. Others in the power supply could be on the verge as well. Best way is to simply bridge the old one with a known good one. A 40-60 uuf @ 450 will give you an indication. Once a bad one is confirmed, replace it with the correct value.
I do not recommend a wholesale change out until the diagnosis is complete and the set is operational.
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