Vol. 9, No. 4

April 18, 2023July 19, 2024By 61
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Volume 9, Number 4

On the Cover

The base-branding machine in the De Forest Radio Co. plant, ca. 1929. The five-pin basses rotate into contact with the branding die – the white object at lower center above the pipe elbow. Heated by a gas flame just below, it burns the De Forest script logo into the base.

In this issue
  • Robert Adler and Tubes
  • Civilian “Military” Tubes
  • Amperex- Special Quality- Tubes
  • A Barkhausen Receiver
  • Cleaning Water Cooling Systems
  • TCA 2007 Board/Member Meetings
  • History of Development of Vacuum Tubes and Vacuum Tube Sockets
  • Weird Tube of the Month: The 6462

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