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Use the series light bulb trick and start disconnecting stuff from the B+ supply to find the short...along with bad filter cap, have seen a lot of shorted PS rectifier diodes in these type sets...the diodes can short, they then let AC into the cap which goes bad. I think this is a transformer powered voltage doubler power supply Best to replace both the diodes and the cap (s) when a short is suspected.
Also several times I have found the Circuit breaker to be bad...have replaced it with a fuse.
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