In a mixing bowl, cream butter and sugar. Add eggs, sour cream and extract; mix well. Combine flour, baking powder, and salt. Add to creamed mixture and mix well. Spread half of the batter in a greased and floured 12-cup fluted tube pan. Sprinkle with half of the almonds. Spread half of the preserves to within 1/2 inch of the edges. Cover with remaining batter. Spoon remaining preserves over batter to within 1/2 inch of egdes. Sprinkle with remaining almonds. Bake at 350 for 55-60 minutes. Cool in pan for 15 minutes.