Doubt its the CRT. Either the 3 CRT cathodes are very low volts,
or the G-2 (screen) is to high. Cathodes should be APX 120 VDC - 170vdc
and G-2 @400-500 VDC>
Dont mess with menus now Its VERY rare for them to go this far
from the reservation.
If there are no color controls ( R, G, B & drives ) the set uses AKB
& automaticly adjusts itself.
Zeno
LFOD !