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I would disconnect the wire from the 5U4 to the capacitor connected to the 5U4 filament/cathode and turn the set on. Measure the voltage and watch the tube carefully. It should have some DC but without anything connected to the output of the 5U4 it will be low. Make sure the wire goes to the + terminal on the electrolytic. If voltage is there, turn the set off and check for a short on the + terminal of the capacitor.
If you have a variac it can simplify troubleshooting power supplies.
Also, check the capacitors that you disconnected to be sure they are the right voltage rating.
If all goes well, connect only that capacitor to the 5U4 to see what the voltage is. As stated earlier, if anything starts to overheat, turn it off and look for a short or a backwards capacitor.
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