There are a variety of factors that govern the size of transformers. In power transformers, temperature rise can be a big factor- transformers that don't get as hot tend to be larger.
In output transformers, the amount of bandwidth that the transformer has on the low end has an effect on the size, as does the power that the transformer can deliver. If the transformer is set up in a class A amplifier, it might be a bit larger as well.
This is all general...YMMV
In output transformers, the amount of bandwidth that the transformer has on the low end has an effect on the size, as does the power that the transformer can deliver. If the transformer is set up in a class A amplifier, it might be a bit larger as well.
This is all general...YMMV