Admiral 12X12 Transformer 80B21 Replacement

[rca21d645]

I have a 1949 Admiral 12X12 that I would like to try and restore, but it appears as though the main transformer has internally shorted. I have been trying to locate a suitable replacement, but I'm not entirely sure what my options are here, and I fear that due to its age it may be nearly impossible to find one. The transformer has a model number of 80B21, and upon doing some of my own research I found a Thordarson catalog from 1965 that listed their 26R20 as a replacement transformer, but I have been unable to find either transformer for sale online. If anyone knows where I can buy a replacement for this transformer or would be willing to sell me one I would greatly appreciate it.