Arcade enthusiast / monitor newbie

[ChrisW6ATV]

Originally Posted by JBingo

Do the T and W stand for an attribute/feature that differentiates the two, or is it just a random letter assigned?

I never learned how the letters in CRT numbers were decided (nor regular tubes, for that matter), except for the details Tom (Electronic M) mentioned. In this case the JT and the JW are the specific identifiers; the 19V is viewable size diagonally, and the P22 is the phosphor type assigned to all color CRTs. Other countries had the picture size in millimeters and a B instead of the P (but I do not know why), so the 240AB4 in that Ebay auction is about a 9-inch black-and-white CRT. The ones with numbers starting like A68 represent the number of centimeters diagonally (an A68 CRT is about a 25-inch CRT).