This listing is for a pair of good used vintage Sylvania type 6C4WA triode vacuum tubes with triple mica.
This tube is equivalent to types 6100 and 6C4W and is a ruggedized version of a 6C4 tube.
These tubes were made for the military and are printed "JHS 6C4WA". They both have date codes from 1966.
These tubes tested great on a reliable Hickok Model 800A tube tester (a dynamic mutual conductance tester). ... and NO shorts or gas detected.
Here are the readings in micromhos : 2300 & 2300 - perfectly matched and above new tube specs!
Ref: Minimum readings should be 1320 micromhos (60%) and new tubes should test at 2200 or more micromhos.
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