(And of course
no amount of drive electronics work can add
deflection plates to a tube that doesn't have them.)
Puttin' em on the
outside won't work, eh?
Hmm, interesting idea. The final anode conductor may shield the beam
from the field in some circumstances, if it
doesn't, that may work.
You'd need substantially higher deflection voltages,
though, to get
sufficiently high field strengths to be useful.
der Mouse