 Vintage radio enthusiasts contend that the precise digital frequency displays and state-of-the-art, microprocessor-based features of modern amateur equipment lacks the aesthetic appeal and "soul" of amateur electronic gear from the vacuum tube era.Additionally, many find satisfaction in taking commercially-made amateur equipment from the 1930s-1970s, often characterized as boat anchors by US amateurs because of their large size and weight, and carefully restoring it.The proliferation of integrated circuits in modern amateur radio equipment has made amateurs nostalgic for vacuum tube-based designs.