Cream butter, shortening and brown sugar thoroughly, gradually add sugar continue creaming. Add eggs one at a time beating thoroughly after each addition. Sift baking powder, and salt with flour, add alternately with milk beginning and ending with flour. Add vanilla then nuts and blend well.
Turn batter into a well greased and floured 10" bundt pan or tube pan.
Bake at 325 degrees F for 90 minutes or until cake test done. Cool in pan 15 minutes before turning out of pan.