Preheat oven to 325°F. Grease and flour a standard loaf pan or line with parchment.
Stir the baking soda into the sour cream until dissolved; set aside.
Cream the butter and sugar together until light and fluffy, 3–4 minutes.
Add egg yolks one at a time, beating after each addition.
Add the flour alternately with the sour cream mixture, beginning and ending with flour. Mix until just combined.
Stir in vanilla and almond extracts.
Beat the egg whites to stiff peaks; fold gently into the batter.
Spread into prepared loaf pan.
Bake 60–65 minutes, until a toothpick inserted in the center comes out clean. Tent with foil if browning too quickly
Cool in the pan 10 minutes, then transfer to a wire rack.