Vol. 9, No. 3

April 18, 2023July 19, 2024By 45
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Volume 9, Number 3

On the Cover

The vanishingly rare GL-8009, a version of the 880 triode with two extra posts for the grid leads, introduced by GE in 1942. While “intended for television service’ on prewar tv channels, its frequency rating for full power was no more than that of the 880, or 25 MHz.

In this issue
  • Sylvania Special CRT’s
  • RCA Tube Tags
  • More on Blue Glow
  • Adapters for Vacuum-Tube Testing
  • Relative Scarcity of Tubish Widgets
  • Weird Tube of the Month
  • RCA’s Hidden Data
  • RCA and”Child Labor” Tubes
  • Inks for Marking Tubes

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