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Since you've replaced all the electrolytics (and verified they're all in correct polarity), i would tend to suspect wiring error at this point. Does the schematic show any of the electrolytics "floating" (ie., not connected directly to chassis ground)?
Is this set the RCA 630ts that was having the low B+ issue?
There are a number of good oscilloscope tutorials on Google. But the problem at hand should be easy enuff to resolve without a scope.
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