Vol. 7, No. 1

Volume 7, Number 1

Volume 7, Number 1

On the Cover

In this issue
  • De Forest’s Numeric Code
  • Undocumented Aliens – A new Look
  • Electron Tubes in Western Union Service
  • 6F6EG? 41E? 7J7E? Say What?
  • The “Most Popular” Final-Amp Tubes
  • More on “DOD” Tubes
  • Author Index

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