Very interesting stuff!
I have a couple early 70s GE TV sets and at least some of the tubes have 2 date codes. One appears to be when the tube was made and the other is a couple years later, apparently about the time the set was built.
If I have my story straight, GE bought Ken-Rad in order to get into the tube making business. I think that was in the late 30s but I can't remember for sure. Both GE & Ken-Rad lines were retained for a time. One of the oddities I have at home is a GE circalite (one of those round loop flourescent bulbs) repackaged as a Ken-Rad.
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Bryan
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