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  • Classification / Category: Vacuum Tube  
  • Artist / Maker / Culture: American Ever Ready Company  
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American Ever Ready Company (2)
Raytheon Manufacturing Company (2)

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cathode and grid from Eveready Raytheon ER224 vacuum tube

cathode and grid from Eveready Raytheon ER224 vacuum tube

Raytheon Manufacturing Company
1922-1930
cathode, grid, and anode from Eveready Raytheon ER227 vacuum tube

cathode, grid, and anode from Eveready Raytheon ER227 vacuum tube

American Ever Ready Company
circa 1930
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The Collection of Historical Scientific Instruments
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