File:Crosley Pup radio - Indiana State Museum - DSC00410 (cropped).JPG

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English: Early radio and television equipment, Indiana State Museum, 650 West Washington Street, Indianapolis, Indiana, USA. Left to right:
  • 1915 De Forest Audion vacuum tube was the first device which could amplify electrical signals, creating the field of electronics.
  • 1923 Crosley "Pup" radio; this single tube receiver was manufactured in Cincinatti.
  • AT&T double button broadcasting microphone used in Indianapolis' first successful radio station, WFBM, established 1924.
  • 1927 experimental television receiver prototype built by Morris VanWay for RCA used a spinning disk with holes in front of a neon light to create an image. Before modern electronic scan television was developed around WW2, many radio stations broadcast experimental mechanical scan television programs.
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Source Self-photographed
Author Daderot
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31 March 2011

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current15:31, 25 February 2018Thumbnail for version as of 15:31, 25 February 2018963 × 1,060 (352 KB)GeeTeeBeeFile:Radio equipment - Indiana State Museum - DSC00410.JPG cropped 78 % horizontally and 67 % vertically using CropTool with lossless mode.
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