Vol. 5, No. 4

Volume 5, Number 4

Volume 5, Number 4

On the Cover

In this issue
  • TCA Annual Meeting
  • Silica Valves
  • A Last Word on the RCA “Dark” Heater
  • Vacuum Tubes the hard Way
  • Some Magic Eyes
  • The Pirani Test
  • “Playthrough” and Gridless Triodes
  • Some Metal-Tube History

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