National Archives photo from Camp Evans.
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The Evans Signal Laboratory Photos electronics - June 1946  Cover

   In June of 1946 Dr. Harold Zahl's VT-158 was the cover tube of electronics.

   The photo description...

  CIRCUIT UNDER GLASS - Grid lines and plate lines are within the quadruple-triode VT-158,
used in the TPS-3 radar transmitter.
Final assembly at Evans Signal Laboratory.

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The March 1964 issue of Popular Electronics had a story on the VT-158
See THE SECRET TUBE THAT CHANGED THE WAR

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Page updated January 18, 2004   page created January 18, 2004

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