An X-ray of Historic Audion vacuum tube. This tube made in the 1920's was the first circuit used to amplify radio and television signals. This tube proved critical for the development of television. The Audion vacuum tube was invented in 1906 by Lee de Forest | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Kinsman, Edward |
Taille de l’image : | 2700 px × 4537 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : |
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