Grease a 10-inch tube pan (angel food pan) and set aside.
Preheat oven to 325.
In an electric mixer with a paddle attachment cream the butter and sugars until light and fluffy. Make sure to scrape down the sides of the bowl. About 5 minutes.
Add the eggs one at a time and mix well in between.
Combine the flour, salt and baking powder and set aside.
Add the vanilla to the milk and set aside.
Alternate the flour and milk mixtures into the electric mixer until all are incorporated.
Pour the batter into the prepared pan.
Bake for 70 -85 minutes until a toothpick comes out clean.
Cool for about 20 minutes in the pan.
Then loosen the cake from the pan and turn it out onto a wire rack or plate to cool completely.