Made by Northern Electric the Canadian arm of Western Electric. Tested 3600 µmhos on a Hickok 752A.

Minimum is 2700. Black plate, square getter. Date Code 5952. (last week of 1959)

 


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Northern Electric 403B 5591 Vacuum Tube NOS

  • Product Code: Northern Electric 403B
  • Availability: 1
  • $15.99 USD


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Tags: Northern Electric, 403B, Vacuum Tube