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The letter C in front of the tube # indicates it was a regunned tube.
No body used "recathoded" guns in 1977. New guns were very easily available then.
That was the system Zenith used.
AA is 100% new. RCA called their new tubes Hi-Lite, RCA regunned tubes were called Colorama.
A is new phospher and gun.
Sylvania started this, but it never panned out, too much work for amount of profit received, which was negative.
If the label on the tube says "Grade C, all used components" in the description portion, then it would be all used. I do not know any one who sold fully used tubes then, since regunned delta gun tubes were readily available for $25.
Many fancy names were also used for marketing, including the independents.
"Chrome, Chroma, Chroma View" this and that was extremely popular.
You should also remember when you are dealing with major corporate entities, they did not want their products repaired, they want consumers to keep buying product. Why do you think major electronic manufacturers are thrilled to see digital ?
Now they can control the complete life cycle of the product, you think a small TV repairman is going to repair the IC chip with his $19.95 Radio Shack meter ?
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