First thing is to do as Tom suggested and pull the rectifier, check your raw AC plate voltages on each side of the center tap. If it turns out to be shorted you could try posting a classifieds ad over on ARF for a parts set. Otherwise you can harvest a power transformer from a lot of radios of the same vintage provided it physically fits your chassis. Aim for something close to the same number of tubes. It would also help if you post pictures of your bad transformer, including outside dimensions and mounting bolt spacing.
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