Old Stock Replacement CRT's On Milwaukee Craigslist

[Robert Grant]

Originally Posted by kvflyer

I think if the tube number ends in a 4 (excluding the "A"), it is BW for "four elements"...

You are correct in that the "P4" suffix indicates a Black-and-white CRT.

Actually, the "P4" suffix means "medium-short persistence white phosphor" (usually zinc sulfide, for a B&W picture).

The "P22" suffix indicates "arranged groups of red, green and blue phosphors" (i.e., color).

Both types of CRT come with a varying number of electrodes (elements).

Rob