Vol. 12, No. 2

Volume 12, Number 2

A stach of rare Philco-branded “export” tubes as recently found in Canada. See the story on page 2.

In this issue
  • “Export” Tubes in Canada
  • Those ABC Grades of Vacuum Tubes
  • Bell Labs Control Tubes
  • The CK703 Crystal Tubes
  • Sparton Tubes
  • 1931 De Forest Tube Kit
  • The 6AJ5 Mystery
  • The Tenth Anniversary of “Emission Labs”
  • Weird Tube of the Month: The Last “Red Bank” Tubes
  • Factory identifiers for “CV” Valves
  • QRS Rectifiers

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