Acorn Tube < Web >

: Featured in classic pre-war and wartime receivers like the Hallicrafters S-27 and National 1-10 .

: Unlike standard tubes with pins at the bottom, acorn tubes have pins protruding from the "equator" of the glass bulb. acorn tube

Acorn tubes were the "hidden heroes" of World War II electronics: : Featured in classic pre-war and wartime receivers