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From what I understood, there were different levels of quality in these tubes, grade A or B CRTs or even grade C, for a cheapo low grade TV, a top line RCA or Zenith would have a top quality grade A tube, and clones have tubes that did not meet the standard of A would have B or C, replacement tubes in shops would often also be B or C, unless one payed a premium for an A.
The one in my GE is clearly a B or C because of the mask flaw in the middle of the screen.
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