This doesn't make sense to me since the construction of the CRT gun is so weird.Dennis,
Both the 11301, 11301A manuals and the micro fiche says it's right.
When the analog 11k's do EA (Enhanced Accuracy) one part is adjusting the gains to match the graticule.
They way they do that vertically is to generate two short horizontal traces, about one div in length,
and separated vertically by a small gap then moving the pair slowly up and down across the first and
then the last graticule lines. The scope detects when the pair crosses the lines and adjusts the gain
after that info. Same thing is done horizontally but with vertical traces and on graticule lines 2 and 10.
Maybe/probably that sensing feature requires some odd stuff in the CRT.