GE branded Mullard 6V4-EZ80 rectifier tube, NOS NIB NEW



 Mullard Blackburn "B3.." factory glass code and Mullard tube type code "kC1", gray plates and D-style getter.  Branded as "GE" here in the states.

Each tube tested uniform and nicely balanced, with each plate section testing in the 1400 to 1500 range, which is a perfect score for 6V4 on this tester.

TEST METHODOLOGY:

  • Test results from my professionally calibrated Western Electric KS-15560-L2 tube tester (advanced version of Hickok 539B, with better gas test and filtered bias supply), with digital plate current meter upgrade.
  • Min Good for rectifiers is 800+ on Western Electric KS-15560-L2 tube tester
  • No shorts
  • perfect Life Test

[INV7]