Quote:
Originally Posted by trinescope
Not sure who made these tubes besides RCA. Mine is also 4 13 date code.
Here is the best I could do with a phone camera to get a picture of the phosphor dots; the holes I mentioned show up mostly on the blue and red here.
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Notice that the red dots are slightly larger than the green and blue? Remember that the red phosphor at the time was less efficient than those used for green and blue. It's known that the red gun was run harder to compensate for this, perhaps they also made the dots slightly larger to help as well?