Those sets were a hodge-podge of whatever parts were available. They had war surplus, mfr's overruns, old stock, and whatever. So they made up a special transformer to accommodate the strange output tube, of which they probably got a few thousand for almost nothing.
When you are done, it will probably work fine, but be careful because I suspect finding a replacement output tube may be a challenge. Be SURE to replace the grid coupling capacitor with a new one.
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