Add a few pounds of silver and you end up with something special.
Without a size reference it is hard to tell exactly what you are looking at but let me just say that is a very large 80% nickel 5K output transformer that will do around 3W full range!
For reference, most people consider moving one size up from the autoformer size is a big 80% core. Well these babies are 6 sizes up and sounding wonderful with a 2A3 playing Elvis's Christmas.
Happy Holidays to all!