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)

Northern Electric 403B 5591 Vacuum Tube NOS

Qty

NOS vacuum tube with grey plates and bottom halo getterTested 3400/3400 on Hickok 752A, where minimu..

$13.99 USD

Reliable, Ruggedized, Longlife tubes made to Western Electric specs. 40 Volt 2C51 / 396A. Perfectly ..

$32.99 USD

Made by Northern Electric the Canadian arm of Western Electric. Tested 3800 µmhos on a Hic..

$15.99 USD

Reliable, Ruggedized, Longlife tubes made to Western Electric specs. Closely matched at 4000 / ..

$32.99 USD

NOS vacuum tube with top halo getter. Balanced test at 925/950 on Hickok 752A, where minimum is..

$29.99 USD

NOS brown base vacuum tube with black plate made by SylvaniaTested 750 on Hickok 752A, where minimum..

$69.99 USD

May be a 6 volt Western Electric 310A and a direct drop in for a WE 428ATested 750 on Hickok 7..

$129.99 USD

Tested new on a Hickok 752A. Emission result 925/950. Minimum is 650/650.Black plate tube, made..

$29.99 USD

Tested new and balanced on a Hickok 752A. Emission result 625/625. Minimum is 400/400. Rug..

$39.99 USD

Tested new on a Hickok 752A. Emission result 975/925. Minimum is 650/650.Black plate tube, made..

$24.99 USD

NOS matched pair tubes made in USA and branded Continental on the base. Both tested 1000/1000 on a H..

$49.99 USD