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You want to be careful with that rectifier tube, as a shorted tube (or any other short in the B+ line) can fry the power transformer. Your 6X5 could have failed on it's own; or, it could have failed due to an excessive load somewhere in the radio. Since you changed all of the capacitors; you'll need to make sure there are no frayed wires that are touching the chassis or other parts. The same goes for any component leads. Also, make sure that no solder balls or any other conductive objects are in the chassis. I'd also suggest placing a fuse in the center tap of the HV winding on the power transformer. A fuse on the order of 250-500 mA should work. Most of these old radios were not fused and a fuse would have saved many a power transformer.
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