Vtg 1946 National Radio corp america Tube SW-54-1 Shortwave Comunications AM CWVtg 1946 National Radio corp America Tube SW 54 1 Shortwave Communications AM CW plugged it in, it hummed, but didn't Pick up any stations sure it needs to be cleaned been sitting for decades.. info below from the nation radio museum. National's model SW 54 was a very popular entry level communications radio during the 1950s. It was made from 1950 1957. Priced at $50 $60, it was directly competitive with the also popular Hallcrafters sr 38 which went