I would bet that transformer is salvageable.
I fixed one from a 10" set and it operates at about 10kv, it just up and quit on me in the middle of a recap, the ohms were fine so I figured it was just leaking between the windings.
What I did to fix it:
1. Removed it from the chassis and washed it several times in a tub of hot soapy water, I used something called Ascot Purple Cleaner but 409 or similar would probably work as well.
The reason for failure was obvious, tons of brown murky goo came out of it, probably Cigarette Tar and dust since the set was missing the HV cover and had probably run uncovered for a long time.
2. Rinsed it thoroughly several times until it stopped foaming when gently blow dried with compressed air (be very careful not to blow it apart!)
3. Dried it in the Oven at 180 for about 30 mins.
4. Let it sit overnight in a dry warm place to get all the moisture out, then sprayed it generously with some of this--->
Insulating Epoxy Coating I let it run like water to get inside the windings, repeated that two or three times to get a good thick coating, let it dry and gave it a try, it worked good as new!