[Electronic M]

Originally Posted by baursam

I just found another thread which goes into detail KP4 vs KP4A, post at very bottom


http://www.videokarma.org/showthread.php?p=3065780

BTW: In case you don't know here is some trivia on CRT numbering. The P# digits (IE P1, P4, P22, etc) indicate phosphor color...P1 being green P4 being white, P22 being a full color tri-phosphor CRT.
The first numbers are diagonal CRT face size in inches, but in ~1967-68 it changed to viewable screen area diagonal. The letters before the P I believe are arbitrary unique-to-the-type identifiers and suffixes past the P# usually indicate slightly 'improved' compatible versions.