Pull 7Y4 tube and see if the transformer still heats. If not transformer is good. Pulling 7Y4 takes the load off high voltage windings.
With the tube removed you could also verify voltage on each plate of the 7Y4. Both plates must have the same voltage for a transformer to be good.
http://www.nostalgiaair.org/PagesByModel/523/M0013523.pdf
If your transformer is bad should be able to find a replacement here:
http://www.oldradioparts.com/2a23efl.txt
Norm
:I just recapped the electrolytics, and tested all the tubes on this radio, however, there is a short as the transformer heats up and I get no sound. Is it possible that that block condensor near the transformer could be shorted? Any suggestions are appreciated.
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Unlikely, but there could be a short in the filament string to chassis ground.
Lewis
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Clifton
::The block capacitor is across the primary of the transformer. This would not cause the transformer to overheat. Pull the rectifier tube out then power up the set. If the transformer still gets hot it probably has shorted turns. If it stays cool then there is a short in the B+ line. Make sure the filter capacitors polarity is correct. Positive ends on each side of the field coil.
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:Unlikely, but there could be a short in the filament string to chassis ground.
:Lewis
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