>>2919665
>i havent found anything online thats similar

likely the reason they used this transformer is that, back in the 70's, say, these were very common
many TVs were powered directly from 120V, so they needed an output transformer to isolate the speaker in case anyone added headphone jacks
you wouldnt want line voltage close to someone's head
of course, TVs are now all isolated, so these are obsolete
you can maybe scavenge a similar one from an old TV
if you find something new, it's likely gonna be way way overpriced, as the pic shows