7JP4 Tube Grading

[dieseljeep]

Originally Posted by miniman82

I see grade 'A' on RCA Hi-lite tube all the time, the sticker usually states the envelope was checked and a new gun installed. So an 'A' grade rebuild would be a used envelope with new gun, anyone's guess what the other grades mean- probably some sort of defect causing a small blemish in the image.

I've seen type grade AA, meaning new glass.
The RCA HI-lites were originally all new, where the Colorama's were the re-guns. I suppose, that changed later.
The local rebuilder used to state on their labels, "Electronically, this is a brand new picture tube."