Edited sentence: A vintage facet of the hobby that enjoys a strong following involves Amplitude Modulation on shortwave.Classic AM activity.Hobbyists here pursue vacuum tube technology and utilize a form of radio reception and transmission that provides the warm, inviting sound reminiscent of old wooden radios that once served as the family's entertainment center.The popularity of this part of the hobby is evidenced by thousands of participants in national on-air operating events showcasing "heavy metal" transmitters from the past, on parade much like the old car hobby