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If you have a 15GP22 and a 21-inch side by side, you can easily see if the green phosphors are the same. Put on color bars and turn up the color level (and maybe turn down the brightness) so there is absolutely no red or blue in the green. Or, disable the red and blue guns Try to get both about the same brightness to make it easier. The non-P1 (sulfide) green phosphor will look yellower than the original P1 green.
Another clue (but harder to see) is that the P1 green persistence is longer than the sulfide green, and if you know how to run your eyes quickly over a white object on a dark background, you will see a green smear on the original P1, more than on a sulfide tube. Another way to see this is to stand far away (like 40 feet) from the two sets while they show a black and white picture and run your eyes rapidly left and right. Inthis case, the whole screen is the "white object". Another way to see a difference in persistence is to spread your fingers apart and wave your hand rapidly in front of an all-white screen, looking for color fringes.
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