Set out butter to soften. Sift together flour, salt, baking powder. Grease bottom of 10-inch tube pan. Separate eggs; beat yolks well; beat egg whites until stiff. In a large mixing bowl, cream together butter and brown sugar. Add beaten egg yolks, mixing well. Combine milk, vanilla and coffee dissolved in 3 Tablespoons hot water. Add alternately with dry ingredients. Fold in pecans and egg whites. Pour into pan and bake at 325 degrees 1-1/2 hours. Let cool in pan on cake rack. Remove from pan. Serves 12.