[rescue] Vector Plotters

[Bob Darlington]

The 7104 is an engineering masterpiece in CRT design, but it's not a normal
CRT.  It's effictively a CRT with a night vision scope built in for very
fast traces which are very dim.

-Bob

On Tue, Oct 6, 2015 at 10:35 AM, Richard <legalize at xmission.com> wrote:

> In article <5612D192.8040104 at neurotica.com>,
>     Dave McGuire <mcguire at neurotica.com> writes:
>
> > [...] it's
> > trivial to move an electron beam VERY VERY QUICKLY.  Look at super-fast
> > analog oscilloscopes like the Tektronix 7104.
>
> I wouldn't call it trivial to move it very, very quickly.  It is
> trivial to move an electron.  Moving it very, very quickly is
> non-trivial.
>
> Tektronix has spent many decades incrementally improving the circuitry
> for deflecting the electron beam.  The 7104 dates from 1978 by which
> time Tektronix had already spent a couple decades improving their
> deflection beam technology.  It isn't the mass of the electrons that
> matters in the circuitry of deflecting the beam; it's the electrical
> response time of the magnetic/electrostatic mechanism in response to
> changes in the input signal.
> --
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