According to Joseph Gwinn :
In article . com,
wrote:


[ ... ]

I think that the difference between electrostatically-deflected and
electromagnetically-deflected CRTs is the difference between C and L,
simply put. We have ways of generating high potentials accurately, but
current foldback is less available. Thus, as you wrote,
magnetically-deflected CRT monitors usually sweep the same way each
time. This is more a characteristic of the driving circuitry than the
CRT itself, in my opinion.

Not entirely. The inductance of the deflection coils is significant,
and prevents fine modulation of the position of the electron beam fast
enough to matter.

Typical deflection coils have a serious problem with fast vector
graphics, but there are (or were) custom one, made by Celco (Mahwah
N.J.) explicitly for such purposes, with rather elaborate mounting for
special CRTs, giving very fine adjustment capability for all elements of
yoke position.

I just checked -- they are still in business, and you can start
checking he

http://www.celco.com/ElectronOptics/

In particular, you may want to start he

http://www.celco.com/ElectronOptics/HighSpeedRaster.asp

and note the ones which are specifically listed as "fast settling" and
"low inductance".

However, given the nature of the applications, and the lack of
listed prices, I suggest that you be sitting down when you call them to
get that information. :-)

Enjoy,
DoN.

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