Preheat oven to 325 degrees. Prepare a tube pan with butter and flour. (or baking spray)
Whisk together the flour, baking soda, and salt. Set aside.
3 cups All-purpose flour, 1/4 tsp Baking Soda, 1/2 tsp Kosher salt
Cream the butter and sugar together for 3 to 4 minutes until it's pale yellow and fluffy.
1 cup Unsalted butter, 3 cups Sugar
Add eggs one at a time, beating well after each addition. Scrape down the sides of the mixing bowl often.
6 large Eggs
Add the dry ingredients in thirds alternating with the sour cream. Ending with the sour cream.
1/2 pt Sour Cream
Mix just until incorporated, add the vanilla, and mix again. Pour the cake batter evenly into the prepared pan.
2 tsp Vanilla Extract
Bake for 1 hour and 15-25 minutes, or until a toothpick inserted in the center comes out clean.
Cool in the pan on a wire rack for at least 10 minutes and then invert the cake onto a plate and cool completely.